Future prospects of the op-cal levita-on experiment ( ) - - PowerPoint PPT Presentation

Future prospects of the op-cal levita-on experiment (光学浮上実験の今後の展望)

KAGRA observatory, Ins-tute for cosmic ray research, University of Tokyo NAGANO Koji (長野 晃士)

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 1

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 2

• Introduc-on
• Schedule
• Applica-ons of op-cal levita-ons
• Experimental setup design proposal
• Problems
• Conclusion
• Summary

Outline

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 3

• For gravita-onal-wave (GW) detec-ons or studies
• f the macroscopic quantum mechanics,

extremely low noise systems are required.

• About the seismic noise reduc-on, suspension

systems are oVen used.

• However, the suspension systems induce

addi-onal thermal noises.

Introduc-on

• K. Komori,

Master thesis, University of Tokyo (2016) 5-mg mirror suspension

• E. Hirose+, CQG (2014)

Suspension system of KAGRA (Cryogenic part)

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 4

• Suspension thermal noise is one of the major

noise sources of interferometers which close the sensi-vity window reaching the standard quantum limit (SQL).

• Reaching SQL is a kind of milestone of the test
• f the macroscopic quantum mechanics.
• In addi-on, if we can demonstrate to beat

SQL, that is, to reduce the quantum noise, it leads to improvement of the sensi2vity of GW detectors.

Introduc-on

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 5

• The suspension thermal noise can be ex-nguished

when masses are levitated with op-cal radia-on pressure instead of suspended with mechanical wires.

• This technique is called as an op-cal levita-on (OL).

Introduc-on

fluctua-on gravity gravity radia-on pressure tension

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 6

Introduc-on

光学浮上が熱い

2

mass scale sensitivity(m/rtHz) fg ng ug mg pg

• 12
• 11
• 10
• N. Kiesel+: PNAS 110, 14180 (2013)

cavity / 0.15um / 10fg? / 64K, 4e-12 m/rtHz

• 13
• T. Li+: Science 328, 1673 (2010)
• T. Li+: Nature Physics 7, 527 (2011)

tweezer / 1um / 1pg / 1.5mK, 1e-13 m/rtHz, Brownian velocity

• A. Arvanitaki, A. A. Geraci : PRL 110, 071105 (2013)

cavity / 0.2~75um / fg~pg / ~1e-14m/rtHz, GW

• A. Ashkin+: Appl. Phys. Lett. 19, 283 (1971)

tweezer / 20um / 10ng? / ?? m/rtHz

• G. Guccione+: arXiv:1307.1175

cavity / 2mm / 0.3mg / ?? m/rtHz

• R. Kaltenbaek+ : Experimental Astronomy 34, 123 (2012)

cavity / 0.1um / 10fg? / ~1e-12m/rtHz?, MAQRO

• S. Singh+: PRL 105, 213602 (2010)

cavity+tweezer / 60um / 40ng / 1e-10m/rtHz

• Y. Arita+: Nature Communications

4, 2374 (2013) tweezer / 4.4um / 0.1ng? / 40K, 1e-10 m/rtHz, gyroscope

Plank mass (22 ug)

• Y. Michimura,

Seminar slide

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 7

Introduc-on

光学浮上が熱い

2

mass scale sensitivity(m/rtHz) fg ng ug mg pg

• 12
• 11
• 10
• N. Kiesel+: PNAS 110, 14180 (2013)

cavity / 0.15um / 10fg? / 64K, 4e-12 m/rtHz

• 13
• T. Li+: Science 328, 1673 (2010)
• T. Li+: Nature Physics 7, 527 (2011)

tweezer / 1um / 1pg / 1.5mK, 1e-13 m/rtHz, Brownian velocity

• A. Arvanitaki, A. A. Geraci : PRL 110, 071105 (2013)

cavity / 0.2~75um / fg~pg / ~1e-14m/rtHz, GW

• A. Ashkin+: Appl. Phys. Lett. 19, 283 (1971)

tweezer / 20um / 10ng? / ?? m/rtHz

• G. Guccione+: arXiv:1307.1175

cavity / 2mm / 0.3mg / ?? m/rtHz

• R. Kaltenbaek+ : Experimental Astronomy 34, 123 (2012)

cavity / 0.1um / 10fg? / ~1e-12m/rtHz?, MAQRO

• S. Singh+: PRL 105, 213602 (2010)

cavity+tweezer / 60um / 40ng / 1e-10m/rtHz

• Y. Arita+: Nature Communications

4, 2374 (2013) tweezer / 4.4um / 0.1ng? / 40K, 1e-10 m/rtHz, gyroscope

Plank mass (22 ug)

• Y. Michimura,

Seminar slide

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 8

• So far, two types (or more?) of OLs for mg-

scale mirrors have been proposed.

Introduc-on

tripod type sandwich type

• Y. Kuwahara, Master thesis,

University of Tokyo (2016)

• Y. Michimura+, arXiv

(2017), Opt. Express (under review)

• G. Guccione+, PRL

(2013)

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 9

自由度と安定性

2016/01/27 修士論文審査会 16

自由度 水平(x,y)並進 鉛直(z)並進 x, y軸回転 z軸回転 復元力 サンドイッチ 構成の復元力 光バネ 重力 なし 模式図 Ø 浮上鏡の曲率中心の運動（並進3自由度，回転3自由度）

dx

dF

β z z

dF

dβ

mg

β z

z

• Y. Kuwahara, Master thesis defense , University of Tokyo (2016)

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 10

Fabry-Pérot (FP)共振器

2016/01/27 修士論文審査会 17

• 2枚の鏡を向かい合わせにした装置
• 共振器長Lがλ/2の整数倍のとき共振
• 光軸は2つの曲率中心を通る
• フィネス FSR/FWHM

L λ

λ/2 λ 3λ/2 0.2 0.4 0.6 0.8 1 Cavity length L Transmittance

LASER 透過光 共振 透過率 共振器長 L FSR FWHM

F =

• Y. Kuwahara, Master thesis defense , University of Tokyo (2016)

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 11

光バネ

2016/01/27 修士論文審査会 19

3 2 1 1 2 3 0.2 0.4 0.6 0.8 1 1.2 Normalized Detuning / Intracavity Power

正バネ/ アンチダンピング 反バネ/ ダンピング Blue-detuned Red-detuned

z

共振器内パワー mg＝Frad mg<Frad mg>Frad z=0

• 共振器長を共振点からずらした位置 (z=0) に制御

→ 変位に対して共振器内パワーが変化 → 「光バネ」

固定 可動

z

• Y. Kuwahara, Master thesis defense , University of Tokyo (2016)

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 12

自由度と安定性

2016/01/27 修士論文審査会 20

自由度 水平(x,y)並進 鉛直(z)並進 x, y軸回転 z軸回転 復元力 サンドイッチ 構成の復元力 光バネ 重力 なし 模式図 Ø 浮上鏡の曲率中心の運動（並進3自由度，回転3自由度）

dx

dF

β z z

dF

dβ

mg

β z

z

• 済
• Y. Kuwahara, Master thesis defense , University of Tokyo (2016)

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 13

回転運動の安定性

2016/01/27 修士論文審査会 21

• 曲率中心まわりの x, y軸回転
• ビームスポット位置は不変 → 重力のみ考

慮

dβ

mg

dβ

mg

z z

浮上鏡は下に凸が必要

z軸回転 安定性には無関係

• Y. Kuwahara, Master thesis defense , University of Tokyo (2016)

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 14

自由度と安定性

2016/01/27 修士論文審査会 22

自由度 水平(x,y)並進 鉛直(z)並進 x, y軸回転 z軸回転 復元力 サンドイッチ 構成の復元力 光バネ 重力 なし 模式図 Ø 浮上鏡の曲率中心の運動（並進3自由度，回転3自由度）

dx

dF

β z z

dF

dβ

mg

β z

z

• 済

済 済

• Y. Kuwahara, Master thesis defense , University of Tokyo (2016)

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 15

水平並進の安定性～サンドイッチ構成～

2016/01/27 修士論文審査会 25

β z z

ed mirror

dx

dF

β z z

dF

dx

dF

β z z

dF

浮上鏡の曲率中心の 水平並進変位 オレンジ

パワー P: 小 曲率中心間距離 a: 小 ビームスポット位置変化: 大

→ 復元力 dF∝P/a: 大

赤

パワー P: 大 曲率中心間距離 a: 大 ビームスポット位置変化: 小

→ 反復元力 dF∝P/a: 小

全体で復元力となる 光軸: 曲率中心を通る直線

• Y. Kuwahara, Master thesis defense , University of Tokyo (2016)

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 16

Introduc-on

自由度と安定性

2016/01/27 修士論文審査会 22

自由度 水平(x,y)並進 鉛直(z)並進 x, y軸回転 z軸回転 復元力 サンドイッチ 構成の復元力 光バネ 重力 なし 模式図 Ø 浮上鏡の曲率中心の運動（並進3自由度，回転3自由度）

dx

dF

β z z

dF

dβ

mg

β z

z

• 済

済 済

• Y. Kuwahara, Master thesis

defense , University of Tokyo (2016)

?

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 17

• Advantages and disadvantages of the two

type OL:

Introduc-on

• Since the sandwich type OL has not yet been

experimentally demonstrated, we have to do it.

– According to rumor, the tripod type OL has been demonstrated already in ANU. However, it was just rumor.

• Y. Kuwahara, Master thesis,

University of Tokyo (2016)

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 18

• 結論から言うと、まだ浮上には成功してない。
• ハイパワーを入れると熱的効果なのかロックが

安定にかからない。

• 熱の影響なのか、制御しなくてもロックがかかる

ことも。その符号が3つの共振器で違っていたり してよくわからないことになっていたりする。

• 今使っているのはφ3mm、厚さ0.1mm、曲率

50cmくらいの鏡で、何枚か製作に成功している。

• 最初は浮上鏡をヘキサポッドに置くなどしてアラ

インメントが取れるようにしていたが、安定性の 問題から調整自由度を減らしていっている。

道村さんによるANUの現状報告

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 19

• 現在はスーパーインバーでできた構造に完全に

リジッドに固定するようなものを作り、安定性を 上げようとしている。

• トラップできるレンジが限られていることから、防

振に気を使っているようで、新しい除振台(光学 定盤)を買ったらしい。今後はそこに移動させて 実験を行う模様。

• 全体的にまだまだ少しずつ進めている感じで、あ

と4年はかかるだろうと言っていました。まずは静 電気力の助けを借りて浮かせるかも、と言ってま した。

• オープンな雰囲気で、学生も積極的に受け入れ

ているようなので、今度学生を送りたいですと 言っておきました。

道村さんによるANUの現状報告

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 20

道村さんによるANUの現状報告

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 21

光学浮上実験の応用

• LGモードで光学浮上鏡に運動量を与えて回

転させたら高速回転して遠心力で壊れるので はないかとか、シンクロトロン放射を出すじゃ ないかとか言ってました。

道村さんによるANUの現状報告

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 22

Purposes of the op2cal levita2on experiment

• Demonstra-ng the op-cal levita-on with

sandwich configura-on

• Achievement of the sensi-vity reaching SQL.
• Test of the macroscopic quantum mechanics,

the development of the technique to improve the sensi-vity of GW detectors, such as KAGRA, and other sciences. (and Educa-on of myself and junior students.)

Introduc-on

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 23

At first, let me divide our OL experiment into four phases.

• Phase-0 (we are here)

– Confirma-on of the possibility of the sandwich type OL. (theore-cal study and R&D)

• Phase-1

– Demonstra-on of the OL with sandwich configura-on. – No sensi-vity requirement.

• Phase-2

– Achievement of the sensi-vity reaching SQL.

• Phase-3

– Test of the macroscopic quantum mechanics and the development of the technique to improve the sensi-vity

• f GW detectors.

Schedule

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 24

4 6 8 10 12 2 4 6 8 10 12 2 4 8 12 3

Phase-0 Phase-1 Phase-2 Phase-3

Schedule

H29年度 (D1) H30年度 (D2) X元年度(D3) theore-cal study

• hor. stab. demo.

design setup

mechanics, op-cs, alignment method

• aux. cavity study

build setup levitate 1.6-mg mir.! (3 m) (6 m) (6 m) modify design buy new

• mir. (1 m)

design setup check new mir. check 1.6-mg mir. (6 m) reach SQL!! write paper re-build setup (6 m) fiber MI test (8 m) build and test LSS (6 m) (2 m) write paper write paper buy items build another setup (3 m) enjoy science!!! write thesis write paper : desk work : lab work : exci-ng but uncertain work

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 25

4 6 8 10 12 2 4 6 8 10 12 2 4 8 12 3

Phase-0 Phase-1 Phase-2 Phase-3

Schedule

H29年度 (D1) H30年度 (D2) X元年度(D3) theore-cal study

• hor. stab. demo.

design setup

mechanics, op-cs, alignment method

• aux. cavity study

build setup levitate 1.6-mg mir.! (3 m) (6 m) (6 m) modify design buy new

• mir. (1 m)

design setup check new mir. check 1.6-mg mir. (6 m) reach SQL!! write paper re-build setup (6 m) fiber MI test (9 m) build and test LSS (6 m) (2 m) write paper write paper buy items build another setup (3 m) enjoy science!!! write thesis write paper

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 26

4 6 8 10 12 2 4 6 8 10 12 2 4 8 12 3

Phase-0 Phase-1 Phase-2 Phase-3

Schedule

H29年度 (D1) H30年度 (D2) X元年度(D3) theore-cal study

• hor. stab. demo.

design setup

mechanics, op-cs, alignment method

• aux. cavity study

build setup levitate 1.6-mg mir.! (3 m) (6 m) (6 m) modify design buy new

• mir. (1 m)

design setup check new mir. check 1.6-mg mir. (6 m) reach SQL!! write paper re-build setup (6 m) fiber MI test (9 m) build and test LSS (6 m) (2 m) write paper write paper buy items build another setup (3 m) enjoy science!!! write thesis write paper

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 27

At first, let me divide our OL experiment into four phases.

• Phase-0 (we are here)

– Confirma-on of the possibility of the sandwich type OL. (theore-cal study and R&D)

• Phase-1

– Demonstra-on of the OL with sandwich configura-on. – No sensi-vity requirement.

• Phase-2

– Achievement of the sensi-vity reaching SQL.

• Phase-3

– Test of the macroscopic quantum mechanics and the development of the technique to improve the sensi-vity

• f GW detectors.

Applica-ons of op-cal levita-ons

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 28

4 6 8 10 12 2 4 6 8 10 12 2 4 8 12 3

Phase-0 Phase-1 Phase-2 Phase-3

Schedule

H29年度 (D1) H30年度 (D2) X元年度(D3) theore-cal study

• hor. stab. demo.

design setup

mechanics, op-cs, alignment method

• aux. cavity study

build setup levitate 1.6-mg mir.! (3 m) (6 m) (6 m) modify design buy new

• mir. (1 m)

design setup check new mir. check 1.6-mg mir. (6 m) reach SQL!! write paper re-build setup (6 m) fiber MI test (8 m) build and test LSS (6 m) (2 m) write paper write paper buy items build another setup (3 m) enjoy science!!! write thesis write paper : desk work : lab work : exci-ng but uncertain work

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 29

Applica-ons of op-cal levita-ons

光学浮上の応用先

• 古典力学と量子力学を繋ぐモデルの検証
• R. Penrose: Gen. Rel. Grav. 28, 1572 (1996)
• A. Bassi+: Rev. Mod. Phys. 85, 471 (2013)
• 重力デコヒーレンスの観測
• R. Kaltenbaek+: Experimental Astronomy 34, 123 (2012)
• 巨視的量子現象

エンタングルメント、Schrödingerの猫 etc.

• 超高精度力センサ(～10-20 N/rtHz)

重力逆二乗則の検証、Casimir力

• A. A. Geraci+: PRL 105, 101101 (2010)

重力波検出

• A. Arvanitaki, A. A. Geraci: PRL 110, 071105 (2013)
• 量子情報的な応用(回転の自由度を利用)

4

• 重力波検出における量子雑音低減方法の実証
• Y. Michimura,

Seminar slide

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 30

Applica-ons of op-cal levita-ons

光学浮上の応用先

• 古典力学と量子力学を繋ぐモデルの検証
• R. Penrose: Gen. Rel. Grav. 28, 1572 (1996)
• A. Bassi+: Rev. Mod. Phys. 85, 471 (2013)
• 重力デコヒーレンスの観測
• R. Kaltenbaek+: Experimental Astronomy 34, 123 (2012)
• 巨視的量子現象

エンタングルメント、Schrödingerの猫 etc.

• 超高精度力センサ(～10-20 N/rtHz)

重力逆二乗則の検証、Casimir力

• A. A. Geraci+: PRL 105, 101101 (2010)

重力波検出

• A. Arvanitaki, A. A. Geraci: PRL 110, 071105 (2013)
• 量子情報的な応用(回転の自由度を利用)

4

• 重力波検出における量子雑音低減方法の実証

Test of macroscopic quantum mechanics

• Y. Michimura,

Seminar slide

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 31

Applica-ons of op-cal levita-ons

提案されている検証方法

2016/01/27 修士論文審査会 9

Ø 巨視的な物体では，直接二重スリット実験をする代わりに それに相当する実験をし，重ね合わせが生じるかどうか検証する。 Ø SQLへの到達が必要条件

LASER

PD PD FI BS

• com. mode
• diff. mode
• com. mode
• com. mode
• diff. mode
• diff. mode

dark port bright port

PRM Single photon PD PD FI BS source Ground state mirror |1⟩ |0⟩m or |1⟩m |0⟩U or |1⟩U |0⟩R or |1⟩R

Müller-Ebhardt+(2008) Marshall+(2003) SQLに到達した振動子 同相モードと差動モード の重ねあわせ状態を観測 基底状態の振動子 (SQL到達が必要) → 単一光子で励起 単一光子源 振動子の or の重ねあわせ状態を観測

0 m 1 m

• Y. Kuwahara, Master

thesis defense, University

• f Tokyo (2016)

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 32

Applica-ons of op-cal levita-ons

光学浮上の応用先

• 古典力学と量子力学を繋ぐモデルの検証
• R. Penrose: Gen. Rel. Grav. 28, 1572 (1996)
• A. Bassi+: Rev. Mod. Phys. 85, 471 (2013)
• 重力デコヒーレンスの観測
• R. Kaltenbaek+: Experimental Astronomy 34, 123 (2012)
• 巨視的量子現象

エンタングルメント、Schrödingerの猫 etc.

• 超高精度力センサ(～10-20 N/rtHz)

重力逆二乗則の検証、Casimir力

• A. A. Geraci+: PRL 105, 101101 (2010)

重力波検出

• A. Arvanitaki, A. A. Geraci: PRL 110, 071105 (2013)
• 量子情報的な応用(回転の自由度を利用)

4

• 重力波検出における量子雑音低減方法の実証

Development

• f the noise

reduc-on technique and GW detec-on

gravity experiment

• Y. Michimura,

Seminar slide

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 33

Applica-ons of op-cal levita-ons

(2017116)

• ← →
• !

Displacement sensiWvity [m/rtHz]

• K. Nagano, Master thesis

defense, University of Tokyo (2017)

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 34

At first, let me divide our OL experiment into four phases.

• Phase-0 (we are here)

– Confirma-on of the possibility of the sandwich type OL. (theore-cal study and R&D)

• Phase-1

– Demonstra-on of the OL with sandwich configura-on. – No sensi-vity requirement.

• Phase-2

– Achievement of the sensi-vity reaching SQL.

• Phase-3

– Test of the macroscopic quantum mechanics and the development of the technique to improve the sensi-vity

• f GW detectors.

Schedule

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 35

4 6 8 10 12 2 4 6 8 10 12 2 4 8 12 3

Phase-0 Phase-1 Phase-2 Phase-3

Schedule

H29年度 (D1) H30年度 (D2) X元年度(D3) theore-cal study

• hor. stab. demo.

design setup

mechanics, op-cs, alignment method

• aux. cavity study

build setup levitate 1.6-mg mir.! (3 m) (6 m) (6 m) modify design buy new

• mir. (1 m)

design setup check new mir. check 1.6-mg mir. (6 m) reach SQL!! write paper re-build setup (6 m) fiber MI test (8 m) build and test LSS (6 m) (2 m) write paper write paper buy items build another setup (3 m) enjoy science!!! write thesis write paper : desk work : lab work : exci-ng but uncertain work

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 36

Horizontal op-cal spring demonstra-on

ねじれ振り子の利用

2016/01/27 修士論文審査会 28

YAW 完全な自由質点のmg鏡の代わりに ねじれ振り子を使用

• やわらかい(共振周波数 ~10 mHz)
• サンドイッチ構成の微小な復元力

を感じうる ü ねじれ振り子の運動(YAW)の変化によって サンドイッチ構成の安定性を検証できる

• もとの共振周波数からの上昇を観測

ü g程度の鏡を使用できる

• 0.5inch, 1inch, etc…

鏡の水平並進

• Y. Kuwahara, Master thesis

defense , University of Tokyo (2016)

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 37

At first, let me divide our OL experiment into four phases.

• Phase-0 (we are here)

– Confirma-on of the possibility of the sandwich type OL. (theore-cal study and R&D)

• Phase-1

– Demonstra-on of the OL with sandwich configura-on. – No sensi-vity requirement.

• Phase-2

– Achievement of the sensi-vity reaching SQL.

• Phase-3

– Test of the macroscopic quantum mechanics and the development of the technique to improve the sensi-vity

• f GW detectors.

Schedule

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 38

4 6 8 10 12 2 4 6 8 10 12 2 4 8 12 3

Phase-0 Phase-1 Phase-2 Phase-3

Schedule

H29年度 (D1) H30年度 (D2) X元年度(D3) theore-cal study

• hor. stab. demo.

design setup

mechanics, op-cs, alignment method

• aux. cavity study

build setup levitate 1.6-mg mir.! (3 m) (6 m) (6 m) modify design buy new

• mir. (1 m)

design setup check new mir. check 1.6-mg mir. (6 m) reach SQL!! write paper re-build setup (6 m) fiber MI test (8 m) build and test LSS (6 m) (2 m) write paper write paper buy items build another setup (3 m) enjoy science!!! write thesis write paper : desk work : lab work : exci-ng but uncertain work

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 39

Experimental configura-on in Phase-1

• wave length: 1064 nm
• finesse: 700 (lower, upper)
• input power: 8.5 W (lower)

2.6 W (upper)

• int. reflec-vity: 0.9995 (lev.)

0.992 (l, u)

• freq. noise: 5 x 10-3 Hz/rtHz
• suspension reso. freq.: ~4 Hz
• main cavity servo UGF: ~ 50 Hz(?)
• op-cal zenith angle < 0.02 deg
• pressure: 10-4 Pa
• lev. mirror mass: 1.6 mg
• φ = 3 mm, t = 0.1 mm
• RoC = 30 mm (to be measured)

Under considera-on

(Being modified)

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 40

Experimental configura-on in Phase-1

• wave length: 1064 nm
• finesse: 700 (lower, upper)
• input power: 8.5 W (lower)

2.6 W (upper)

• int. reflec-vity: 0.9995 (lev.)

0.992 (l, u)

• freq. noise: 5 x 10-3 Hz/rtHz
• suspension reso. freq.: ~4 Hz
• main cavity servo UGF: ~ 50 Hz(?)
• op-cal zenith angle < 0.02 deg
• pressure: 10-4 Pa
• lev. mirror mass: 1.6 mg
• φ = 3 mm, t = 0.1 mm
• RoC = 30 mm (to be measured)

Under considera-on これを測るための 共振器に使う鏡と 治具は納品済み

(Being modified)

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 41

Jig for -ny mirror characteriza-on

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 42

Sensi-vity in Phase-1

102 103 104 105 106

Frequency [Hz]

10-20 10-19 10-18 10-17 10-16

Displacement noise spectrum [m/rtHz]

SQL quantum noise coating thermal substrate thermal residual gas thermal frequency noise seismic

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 43

• Use the 1.6-mg mirror, which we have already.
• Use rela-vely high-finesse (~700) cavity.
• Use rela-vely simple laser stabiliza-on system (LSS).
• Light is introduced to the vacuum chamber thought
• p-cal fibers.
• Transmiqed lights in the main cavi-es are extracted by

polarizing beam spliqer (PBS) in the other cavi-es to decouple the cavi-es.

• To keep the op-cal spring effect, main cavi-es are

suspended for vibra-on isola-on to decrease the unity gain frequency (UGF) of their servo (~ a few 10 Hz).

• (If possible) use new digital control system.

Points in Phase-1

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 44

Moku:Lab

hqp://www.liquidinstruments.com ← Venture from ANU

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 45

Moku:Lab

hqp://www.liquidinstruments.com

NOTE: If we use Moku:Lab in control servo, the frequency range is about 1 MHz because of -me delay although sampling frequency is mush higher.

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 46

• How to align the op-cal zenith angle?
• Can we achieve the ver-cal double op-cal spring

where the cavi-es don’t share the op-cal path?

• How to decouple the two main cavi-es from the
• ther?
• How to support the levita-ng mirror before

levita-on?

• How to know the mirror is levitated?
• How to suspend the op-cal bench on which the

main cavi-es are?

Problems(?) in Phase-1

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 47

• How to align the op-cal zenith angle?
• Can we achieve the ver-cal double op-cal spring

where the cavi-es don’t share the op-cal path?

• How to decouple the two main cavi-es from the
• ther?
• How to support the levita-ng mirror before

levita-on?

• How to know the mirror is levitated?
• How to suspend the op-cal bench on which the

main cavi-es are?

Problems(?) in Phase-1

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 48

Zenith angle misalignment effect

m g s i n θ ~0.3 um ~0.02 deg

• Y. Kuwahara, Master thesis

defense , University of Tokyo (2016)

修正

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 49

Zenith angle alignment

• 2つの錘を吊るした紐がアイリスを通るようにする
• アイリスに通るように上下の入射光軸をアライン
• 入射光が浮上鏡の中心(~重心)に当たるよう配置
• 上下共振器の共振が取れるように各鏡をアライン
• 移動させても、再び紐がアイリスを通るよう光学系全体の

水平度を調整すればよいだけ

アラインメント手順案

18

入射光軸 // 重力 入射光軸 // 共振器軸 入射光軸上に重心

2 mm 50 cm 2e-3/0.5 = 4e-3 rad ~ 0.2 deg

• Y. Michimura, Seminar slide

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 50

Zenith angle alignment

100 cm 0.02 deg

QPD Suspended stage Suspended laser source and mirror (Unit)

0.8 mm ※Resolu-on of QPD(S1880): 1.5 um

Fixed to ground

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 51

• Use accelerometer and gyro sensor.

– Accelerometer can detect the gravity direc-on. – Gyro sensor can detect the angle displacement.

• Compare the op-cal cavity axis with the string of

plumb.

– See the transmiqed light axis with IR camera and scaqering something.

Other choices to align op-cal zenith angle

👁 a

scaqering

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 52

• How to align the op-cal zenith angle?
• Can we achieve the ver-cal double op-cal spring

where the cavi-es don’t share the op-cal path?

• How to decouple the two main cavi-es from the
• ther?
• How to support the levita-ng mirror before

levita-on?

• How to know the mirror is levitated?
• How to suspend the op-cal bench on which the

main cavi-es are?

Problems(?) in Phase-1

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 53

Double op-cal spring

• Ordinary case
• Sandwich case

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 54

• Coupled case was demonstrated.

Double op-cal spring

• N. Gordon+,

“Experimental demonstra-on of coupled op-cal springs,” CQG (2017) 10 m prototype in Glasgow

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 55

• How to align the op-cal zenith angle?
• Can we achieve the ver-cal double op-cal spring

where the cavi-es don’t share the op-cal path?

• How to decouple the two main cavi-es from the
• ther?
• How to support the levita-ng mirror before

levita-on?

• How to know the mirror is levitated?
• How to suspend the op-cal bench on which the

main cavi-es are?

Problems(?) in Phase-1

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 56

Decoupling two main cavi-es

• r

Lossy

eg) Thorlabs: high-power cube PBS (PBS12-1064-HP), T = 0.988

• Can we use prism

instead of PBS?

eg1) Thorlabs: plate PBS (PBSW-1064), Tp = 0.993, Ts = 5.5e-5 (1-Ts = 0.999945) eg2) Thorlabs: plate FPB (FPB1059-43), Tp = 0.992, Ts = 6e-7 (1-Ts = 0.9999994)

This PBS has been

• bought. Its reflec-vity

will be measured. (when I have -me…)

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 57

• How to align the op-cal zenith angle?
• Can we achieve the ver-cal double op-cal spring

where the cavi-es don’t share the op-cal path?

• How to decouple the two main cavi-es from the
• ther?
• How to support the levita-ng mirror before

levita-on?

• How to know the mirror is levitated?
• How to suspend the op-cal bench on which the

main cavi-es are?

Problems(?) in Phase-1

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 58

Levita-ng mirror support

• On torsion pendulum - On fixed stage
• On torsion balance (case1) - On torsion balance (case2)

電磁石 磁性体

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 59

• Advantage of torsion pendulum and balance

– mirror posi-on can be adjusted. – ver-cal and horizontal op-cal spring effect can be measured.

• Disadvantage of torsion pendulum and balance

– mirror posi-on is not stable without control. – requirement for mirror displacement RMS

• ver-cal: << 50 pm (free running torsion bar: 50 um)
• horizontal: << 0.6 um (free running torsion bar: 1 mm)

– very strong servo control and damping is required. – low noise sensing for roll is also required.

Levita-ng mirror support

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 60

• Sensing method of torsion pendulum

Auxiliary cavity

roll (ver-cal): cavity magnet

• long. (horizontal):

photosensor yaw (horizontal):

• p-cal lever

for actua-on (coil magnet)

for damping (coil (resistor) magnet)

Auxiliary cavity trans. (horizontal): photosensor

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 61

• How to align the op-cal zenith angle?
• Can we achieve the ver-cal double op-cal spring

where the cavi-es don’t share the op-cal path?

• How to decouple the two main cavi-es from the
• ther?
• How to support the levita-ng mirror before

levita-on?

• How to know the mirror is levitated?
• How to suspend the op-cal bench on which the

main cavi-es are?

Problems(?) in Phase-1

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 62

• Not levitated

How to detect the mirror levita-on

• Levitated

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 63

• When the mirror levitate, the mirror’s

mechanical response should change drama-cally. Thus, we can know the mirror levita-on by measuring the open loop transfer func-on.

• Moreover, if we add the line signal into the PZT
• n which the mirror is (or the aux. cavity incident

light power) and shake the mirror,

– when the mirror is not levitated, the signal can be detected with the main cavity – when the mirror is levitated, the signal can NOT be detected with the main cavity

How to detect the mirror levita-on

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 64

• How to align the op-cal zenith angle?
• Can we achieve the ver-cal double op-cal spring

where the cavi-es don’t share the op-cal path?

• How to decouple the two main cavi-es from the
• ther?
• How to support the levita-ng mirror before

levita-on?

• How to know the mirror is levitated?
• How to suspend the op-cal bench on which the

main cavi-es are?

Problems(?) in Phase-1

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 65

Blade spring or spring?

• Blade spring
• Spring
• r
• Target resonant frequency is 1 Hz for horizontal

and ver-cal.

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 66

• Design of blade spring with COMSOL

– 材質: ベリリウム銅 – 厚さ: 2.5 mm, 長さ: 17.5 cm, 幅: 5 cm (根本), 3.5 mm (先端) – 一枚あたりの荷重: 5 kg (4本で20 kgを懸架)

Blade spring design

厚さ: 2.5 mm

固定方法などの細かい点は川崎くんが設計中。

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 67

• 5 kgを懸架したときの最大応力と変位量

– 最大応力: 166 MPa, 変位量: 1.4 cm (CuBeのバネ限界値>500 MPa)

Blade spring design

166 MPa 1.4 cm 50 N 50 N

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 68

• 5 kgを懸架したときの基本モード周波数変化

– 無荷重時: 95 Hz → 5 kg荷重時: 4 Hz

Blade spring design

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 69

• Not considered problems

– How to make a stable detuning. – Vacuum system.

• To do

– Build high power laser system.

• I consulted Mio-sensei a bit.

– Make frequency reference for frequency stabiliza-on. – Design Laser Stabilizing System, suspension.

• To buy

– Fiber op-cs compa-ble with 1064-nm laser.

• fiber (covered and bare), EOM x2, AOM x2, fiber op-cs (BS,

collimator, FI, and so on), fiber feed through, fiber amp., (laser source?), and so on.

– Cavity mirror (for main and aux.) – Suspension system and op-cal bench.

Other things in Phase-1

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 70

At first, let me divide our OL experiment into four phases.

• Phase-0 (we are here)

– Confirma-on of the possibility of the sandwich type OL. (theore-cal study and R&D)

• Phase-1

– Demonstra-on of the OL with sandwich configura-on. – No sensi-vity requirement.

• Phase-2

– Achievement of the sensi-vity reaching SQL.

• Phase-3

– Test of the macroscopic quantum mechanics and the development of the technique to improve the sensi-vity

• f GW detectors.

Schedule

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 71

4 6 8 10 12 2 4 6 8 10 12 2 4 8 12 3

Phase-0 Phase-1 Phase-2 Phase-3

Schedule

H29年度 (D1) H30年度 (D2) X元年度(D3) theore-cal study

• hor. stab. demo.

design setup

mechanics, op-cs, alignment method

• aux. cavity study

build setup levitate 1.6-mg mir.! (3 m) (6 m) (6 m) modify design buy new

• mir. (1 m)

design setup check new mir. check 1.6-mg mir. (6 m) reach SQL!! write paper re-build setup (6 m) fiber MI test (8 m) build and test LSS (6 m) (2 m) write paper write paper buy items build another setup (3 m) enjoy science!!! write thesis write paper : desk work : lab work : exci-ng but uncertain work

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 72

Experimental configura-on in Phase-2

• wave length: 1064 nm
• finesse: 100 (lower, upper)
• input power: 10 W (lower)

2.1 W (upper)

• lev. mirror mass: 0.2 mg
• int. reflec-vity: 0.975 (lev.)

0.962 (l, u)

• freq. ref. : asymmetric FMI
• Passive stabilizing cavity (double pass)
• - length: 3 m (FSR: 100 MHz)
• - finesse: 3 x 104
• - cavity pole: 1.6 kHz
• - Intracavity power: ~ 300 kW!!

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 73

Sensi-vity in Phase-2

102 103 104 105 106

Frequency [Hz]

10-20 10-19 10-18 10-17 10-16

Displacement noise spectrum [m/rtHz]

SQL quantum noise coating thermal substrate thermal residual gas thermal frequency noise seismic

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 74

• Use new 0.2-mg mirror.
• Use 100-m asymmetric fiber Michelson

interferometer (AFMI) for frequency stabiliza-on around 10 kHz.

• Use passive laser stabilizing cavity (PSC), that

is the cavity with low cavity pole (~ 1 kHz).

• To get effec-ve (2nd order) passive laser

stabiliza-on, the transmiqed light is reflected back to the PSC. (Double-pass configura-on)

Points in Phase-2

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 75

• Such (0.2-mg) small mirror can be made?
• Is the frequency stabiliza-on using AFMI at 10

kHz possible?

• Circula-ng power in the PSC is more than 100 kW

which could burn its mirrors.

• Effect of the displacement of PSC on the effect of

the passive stabilizing should be considered.

• Since cavity pole of main cavi-es is very high (~8

MHz), RF side band can enter the cavi-es to some extent.

• Is there any science which can be done using only
• ne cavity reaching SQL?

Problems in Phase-2

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 76

• Such (0.2-mg) small mirror can be made?
• Is the frequency stabiliza-on using AFMI at 10

kHz possible?

• Circula-ng power in the PSC is more than 100 kW

which could burn its mirrors.

• Effect of the displacement of PSC on the effect of

the passive stabilizing should be considered.

• Since cavity pole of main cavi-es is very high (~8

MHz), RF side band can enter the cavi-es to some extent.

• Is there any science which can be done using only
• ne cavity reaching SQL?

Problems in Phase-2

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 77

• As small as possible mirror is beqer.
• About 1-mg mirror may be upper limit, considering

feasible incident power (lower: 40 W, upper: 12 W, finesse 100).

Mass of levitated mirror

102 103 104 105 106

Frequency [Hz]

10-20 10-19 10-18 10-17 10-16

Displacement noise spectrum [m/rtHz]

SQL quantum noise coating thermal substrate thermal residual gas thermal frequency noise seismic

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 78

• Such (0.2-mg) small mirror can be made?
• Is the frequency stabiliza-on using AFMI at 10

kHz possible?

• Circula-ng power in the PSC is more than 100 kW

which could burn its mirrors.

• Effect of the displacement of PSC on the effect of

the passive stabilizing should be considered.

• Since cavity pole of main cavi-es is very high (~8

MHz), RF side band can enter the cavi-es to some extent.

• Is there any science which can be done using only
• ne cavity reaching SQL?

Problems in Phase-2

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 79

AFMI vs Reference cavity

• r
• K. Nagano, Master thesis,

University of Tokyo (2017) S(?). Takahashi, Master thesis, University of Tokyo (2008)

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 80

• Requirement of the frequency noise is 1 x 10-4

Hz/rtHz at 10 kHz.

• For the ac-ve stabiliza-on, it is relaxed to be

~5 x 10-3 Hz/rtHz at 10 kHz thanks to the PSC.

• Displacement sensi-vity requirement.

– For AFMI (with 100-m asymmetry)

• xAFMI = 1.7 x 10-15 m/rtHz

– For reference cavity (cavity length 20 cm)

• xRC = 3.3 x 10-18 m/rtHz

– Suspended mirror cavity (like KAGRA’s input mode cleaner) can be used?

AFMI vs Reference cavity

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 81

Asymmetric fiber MI sensi-vity

NOTE: In this measurement, laser source was 1550-nm DFB fiber laser, which may be more noisy than 1064-nm NPRO laser.

S(?). Takahashi, Master thesis, University of Tokyo (2008)

NOTE2: Asymmetry was 100 m.

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 82

Asymmetric fiber MI sensi-vity

NOTE: In this measurement, laser source was 1540-nm RIO fiber laser, which is more noisy than 1064-nm NPRO laser.

• R. Šmíd+, “Frequency Noise Suppression of a Single Mode Laser with an Unbalanced

Fiber Interferometer for Subnanometer Interferometry,“ Sensors (2015) NOTE2: Asymmetry was 2.09 km.

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 83

• Such (0.2-mg) small mirror can be made?
• Is the frequency stabiliza-on using AFMI at 10

kHz possible?

• Circula-ng power in the PSC is more than 100 kW

which could burn its mirrors.

• Effect of the displacement of PSC on the effect of

the passive stabilizing should be considered.

• Since cavity pole of main cavi-es is very high (~8

MHz), RF side band can enter the cavi-es to some extent.

• Is there any science which can be done using only
• ne cavity reaching SQL?

Problems in Phase-2

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 84

• Circula-ng power in PSC will be very large, more

than 100 kW.

– For example, circula-ng power in KAGRA’s PMC with high power (~100 W) laser is less than 10 kW. – With pulse laser (10 ps and 250 MHz repe--on rate), 670 kW of average power was demonstrated.

• Is it OK? Or can we resolve it?

– Make beam size large? (smaller intensity) – Make longer cavity? (smaller finesse) – Cool the cavity with liquid nitrogen?

• Anyway, very careful treatment is required to

avoid contamina-on, for example dust.

Circula-ng power in PSC

• H. Carstens+,
• Opt. Leq. (2014)

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 85

• Such (0.2-mg) small mirror can be made?
• Is the frequency stabiliza-on using AFMI at 10

kHz possible?

• Circula-ng power in the PSC is more than 100 kW

which could burn its mirrors.

• Effect of the displacement of PSC on the effect of

the passive stabilizing should be considered.

• Since cavity pole of main cavi-es is very high (~8

MHz), RF side band can enter the cavi-es to some extent.

• Is there any science which can be done using only
• ne cavity reaching SQL?

Problems in Phase-2

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 86

• Such (0.2-mg) small mirror can be made?
• Is the frequency stabiliza-on using AFMI at 10

kHz possible?

• Circula-ng power in the PSC is more than 100 kW

which could burn its mirrors.

• Effect of the displacement of PSC on the effect of

the passive stabilizing should be considered.

• Since cavity pole of main cavi-es is very high (~8

MHz), RF side band can enter the cavi-es to some extent.

• Is there any science which can be done using only
• ne cavity reaching SQL?

Problems in Phase-2

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 87

• Such (0.2-mg) small mirror can be made?
• Is the frequency stabiliza-on using AFMI at 10

kHz possible?

• Circula-ng power in the PSC is more than 100 kW

which could burn its mirrors.

• Effect of the displacement of PSC on the effect of

the passive stabilizing should be considered.

• Since cavity pole of main cavi-es is very high (~8

MHz), RF side band can enter the cavi-es to some extent.

• Is there any science which can be done using only
• ne cavity reaching SQL?

Problems in Phase-2

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 88

• All science ideas using op-cal levita-on which

I have so far require two cavi-es reaching SQL.

• However, it takes a lot of -me and effort to

build another cavity.

• Thus I’d like to do some scien-fic works with
• nly one cavity reaching SQL.
• I believe interes-ng science must exist.
• If you have any idea, please share it with me.

Science of op-cal levita-on experiment

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 89

• Not considered problems

– The effect of the upper cavity’s radia-on pressure noise.

• To do

– Design suspension, op-cs arrangement. – Discuss the possibility of the small mirror with manufacturing company (Sigma, CVI, …).

• To buy

– New small mirror, cavity mirrors.

Other things in Phase-2

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 90

Conclusion

Extended Uchiyama Lab. mee-ng (University of Toyama, Aug. 4th, 2017) 91

4 6 8 10 12 2 4 6 8 10 12 2 4 8 12 3

Phase-0 Phase-1 Phase-2 Phase-3

Summary

H29年度 (D1) H30年度 (D2) X元年度(D3) theore-cal study

• hor. stab. demo.

design setup

mechanics, op-cs, alignment method

• aux. cavity study

build setup levitate 1.6-mg mir.! (3 m) (6 m) (6 m) modify design buy new

• mir. (1 m)

design setup check new mir. check 1.6-mg mir. (6 m) reach SQL!! write paper re-build setup (6 m) fiber MI test (8 m) build and test LSS (6 m) (2 m) write paper write paper buy items build another setup (3 m) enjoy science!!! write thesis write paper : desk work : lab work : exci-ng but uncertain work

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End

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OMAKE

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Phase-0 Phase-1 Phase-2 Phase-3

Confirma2on of the possibility of the

• p2cal levita2on

with sandwich configura2on

• Inves-ga-on of

the sandwich configura-on

• Component

technology development

Schedule

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How to align the op-cal zenith angle?