Compact Diode Laser for Near Infrared Methane Spectroscopy - PowerPoint PPT Presentation

Compact Diode Laser for Near Infrared Methane Spectroscopy Ottillia Ni Me nto r: Dr. K rista n Co rwin Aug ust 5, 2016

Motivation E xpa nd g a s-fille d ho llo w fib e r re fe re nc e s to 1.6 mic ro ns • wa ve le ng ths. o Ab so rptio n spe c tro sc o py a nd sub -Do pple r spe c tro sc o py in me tha ne -fille d ho llo w fib e rs

Challenges of the Diode Laser Using the L ittro w c o nfig ura tio n to c a lc ula te the diffra c tio n • a ng le o ff the diffra c tio n g ra ting . Re c o nstruc ting a nd ma c hining o f a n a da pte d dio de la se r • de sig n a t the ne w g ra ting a ng le . Re de sig ning the mirro r mo unt to a vo id b e a m c lipping , pa ssing • a b e a m ra dius 4x the full width ha lf ma ximum (F WHM). Ne e ding hig h po we r to sa tura te me tha ne fo r sub -Do pple r • spe c tro sc o py

Methane (CH 4 ) 4.0Å ν 3 = 3158.6 c m -1 , 2 ν 3 = 6317.2 c m -1 https:/ / www.re se a rc hg a te .ne t/ fig ure / 278652214_fig 4_F ig ure -18-18-Me tha ne -vib ra tio na l-no rma l-mo d e s http :/ / www.nist.g o v/ pml/ e le c tro ma g ne tic s/ g rp05/ o the r-a c tivitie s.c fm

Assembling a Compact Diode Laser

Interior of the Diode Laser L ittro w Co nfig ura tio n d= line spa c ing α = inc ide nc e a ng le β = diffra c tio n a ng le Θ B = b la ze d a ng le https:/ / e n.wikipe d ia .o rg / wiki/ Bla ze d _g ra ting

Laser Parts T he rmo e le c tric c o o le rs (T E Cs) - he a t pumps use d to c o o l • syste ms. PZT – fine tune po sitio n o f the the la se r • T he rmisto r- e le c tric a l re sisto r use d fo r me a sure me nt a nd he a t • c o ntro l T e mpe ra ture Chip – de te rmine s the te mpe ra ture o f la se r • http://www.ebay.com/itm/400W-12V-Thermoelectric-Cooler-Peltier-Plate-TEC-NEW-/111201613218

Powering the diode laser Cable: 6ft long

Future Works Alig n a nd fib e r-c o uple the la se r, fill a ho llo w c o re fib e r with • me tha ne , a nd tune the la se r to the re so na nc e o f the me tha ne line Co nduc t a b so rptio n spe c tro sc o py a nd sub -Do pple r • spe c tro sc o py a t 1.6 mic ro ns De ve lo p se a le d ho llo w-c o re fib e rs • fille d with me tha ne a b so rb ing la se r lig ht a s a fre q ue nc y re fe re nc e . Ø20 µm https://www.thorlabs.com/thorproduct.cfm?partnumber=HC19-1550

Acknowledgements Spe c ia l tha nks to : Dr. K rista n Co rwin • Dr. Bre tt De Pa o la • Dr. Bria n Wa shb urn • Rya n L ude r • Sa je d Ho sse ini-Za va re h, Ne da Da da shza de h, K usha a n • We e ra sing he , Ma na sa T hirug na na sa mb a nda m F e llo w Physic s RE U Pe e rs • Dr. Bre tt F la nde rs • K im Co y • T his wo rk is pa rtia lly funde d b y the Na tio na l Sc ie nc e F o unda tio n (NSF ) a nd the Air F o rc e Offic e o f Sc ie ntific Re se a rc h (AF OSR) thro ug h NSF g ra nt numb e r PHYS-1461251.

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