[PPT] - Homogenization Without Scattering of Laser Illumination Fergal PowerPoint Presentation

SLIDE 1

Homogenization Without Scattering

f Laser Illumination

Fergal Shevlin, Ph.D. DYOPTYKA, Ireland.

Laser Display and Lighting Conference 2019 Yokohama, Japan.

2019-04-24

1 / 23

SLIDE 2

Diffusers scatter outside apertures

Typical moving diffuser implementation to extend laser source size for intensity homogenization with light guide.

2 / 23

SLIDE 3

Diffusers scatter outside apertures

Typical moving diffuser implementation to extend laser source size for intensity homogenization with light guide. “Efficient” refractive diffusers diffract at microlens apertures.

2 / 23

SLIDE 4

Diffusers scatter outside apertures

Typical moving diffuser implementation to extend laser source size for intensity homogenization with light guide. “Efficient” refractive diffusers diffract at microlens apertures. Intensity profile from 2 ×“2 deg” diffusers outside 4 deg aperture.

2 / 23

SLIDE 5

Deformable Mirror does not scatter

DM active, ν = 50 kHz—1 MHz. ➭ ➭

3 / 23

SLIDE 6

Deformable Mirror does not scatter

DM active, ν = 50 kHz—1 MHz. λ = 50—100 ➭m, A = 0.5—10 ➭m.

3 / 23

SLIDE 7

Deformable Mirror does not scatter

DM active, ν = 50 kHz—1 MHz. λ = 50—100 ➭m, A = 0.5—10 ➭m. DM inactive.

3 / 23

SLIDE 8

Deformable Mirror does not scatter

DM active, ν = 50 kHz—1 MHz. λ = 50—100 ➭m, A = 0.5—10 ➭m. DM inactive. DM surface acts as an extended source.

3 / 23

SLIDE 9

Deformable Mirror does not scatter

DM active, ν = 50 kHz—1 MHz. λ = 50—100 ➭m, A = 0.5—10 ➭m. DM inactive. DM surface acts as an extended source. 2—5 deg “randomized divergence.”

3 / 23

SLIDE 10

Deformable Mirror does not scatter

DM active, ν = 50 kHz—1 MHz. λ = 50—100 ➭m, A = 0.5—10 ➭m. DM inactive. DM surface acts as an extended source. 2—5 deg “randomized divergence.” Intensity profile outside 4 deg aperture.

3 / 23

SLIDE 11

Diffuser scattering versus DM divergence

Thick tails due to scattering from diffusers. Thin tails due to randomized divergence from DM.

4 / 23

SLIDE 12

Small DM projection display apparatus

Nichia LD, 520 nm, 1 W. f=4.51 mm collimating lens. Dyoptyka DM, 3 × 4.5 mm2. f=4.51 mm focusing lens. BK7 lightguide. f /2.4 DLP projector lens. Screen at 5 m for 180× mag. Camera set-up to mimic eye.

5 / 23

SLIDE 13

Small DM projection display apparatus

Nichia LD, 520 nm, 1 W. f=4.51 mm collimating lens. Dyoptyka DM, 3 × 4.5 mm2. f=4.51 mm focusing lens. BK7 lightguide. f /2.4 DLP projector lens. Screen at 5 m for 180× mag. Camera set-up to mimic eye.

5 / 23

SLIDE 14

Small DM projection display apparatus

Nichia LD, 520 nm, 1 W. f=4.51 mm collimating lens. Dyoptyka DM, 3 × 4.5 mm2. f=4.51 mm focusing lens. BK7 lightguide. f /2.4 DLP projector lens. Screen at 5 m for 180× mag. Camera set-up to mimic eye.

5 / 23

SLIDE 15

Small DM projection display apparatus

Nichia LD, 520 nm, 1 W. f=4.51 mm collimating lens. Dyoptyka DM, 3 × 4.5 mm2. f=4.51 mm focusing lens. BK7 lightguide. f /2.4 DLP projector lens. Screen at 5 m for 180× mag. Camera set-up to mimic eye.

5 / 23

SLIDE 16

Small DM projection display apparatus

Nichia LD, 520 nm, 1 W. f=4.51 mm collimating lens. Dyoptyka DM, 3 × 4.5 mm2. f=4.51 mm focusing lens. BK7 lightguide. f /2.4 DLP projector lens. Screen at 5 m for 180× mag. Camera set-up to mimic eye.

5 / 23

SLIDE 17

Small DM projection display apparatus

Nichia LD, 520 nm, 1 W. f=4.51 mm collimating lens. Dyoptyka DM, 3 × 4.5 mm2. f=4.51 mm focusing lens. BK7 lightguide. f /2.4 DLP projector lens. Screen at 5 m for 180× mag. Camera set-up to mimic eye.

5 / 23

SLIDE 18

Small DM projection display apparatus

Nichia LD, 520 nm, 1 W. f=4.51 mm collimating lens. Dyoptyka DM, 3 × 4.5 mm2. f=4.51 mm focusing lens. BK7 lightguide. f /2.4 DLP projector lens. Screen at 5 m for 180× mag. Camera set-up to mimic eye.

5 / 23

SLIDE 19

Small DM projection display apparatus

Nichia LD, 520 nm, 1 W. f=4.51 mm collimating lens. Dyoptyka DM, 3 × 4.5 mm2. f=4.51 mm focusing lens. BK7 lightguide. f /2.4 DLP projector lens. Screen at 5 m for 180× mag. Camera set-up to mimic eye.

5 / 23

SLIDE 20

Small DM projection display apparatus

Nichia LD, 520 nm, 1 W. f=4.51 mm collimating lens. Dyoptyka DM, 3 × 4.5 mm2. f=4.51 mm focusing lens. BK7 lightguide. f /2.4 DLP projector lens. Screen at 5 m for 180× mag. Camera set-up to mimic eye.

5 / 23

SLIDE 21

Projected image, 1.4 m diagonal, DM inactive 6 × 4.8 × 60 mm3 LG

6 / 23

SLIDE 22

Projected image, 1.4 m diagonal, DM active 6 × 4.8 × 60 mm3 LG

7 / 23

SLIDE 23

DM inactive versus active

Mean intensities 52.4% vs. 46.8%.

8 / 23

SLIDE 24

DM inactive versus active

Mean intensities 52.4% vs. 46.8%. Regions of relatively homogeneous intensity.

8 / 23

SLIDE 25

DM inactive versus active

Mean intensities 52.4% vs. 46.8%. Regions of relatively homogeneous intensity. Speckle contrast ratios 16.3% vs. 6.5%.

8 / 23

SLIDE 26

DM inactive versus active

Mean intensities 52.4% vs. 46.8%. Regions of relatively homogeneous intensity. Speckle contrast ratios 16.3% vs. 6.5%.

DM active: Intensity ×90%; SCR ×50% (approximately.)

8 / 23

SLIDE 27

Projected image, 1.4 m diagonal, DM inactive 6 mm × 150 mm LG

9 / 23

SLIDE 28

Projected image, 1.4 m diagonal, DM active 6 mm × 150 mm LG

10 / 23

SLIDE 29

DM inactive versus active

Mean intensities 44.4% vs. 40.8%.

11 / 23

SLIDE 30

DM inactive versus active

Mean intensities 44.4% vs. 40.8%. Regions of relatively homogeneous intensity.

11 / 23

SLIDE 31

DM inactive versus active

Mean intensities 44.4% vs. 40.8%. Regions of relatively homogeneous intensity. Speckle contrast ratios 8.7% vs. 3.8%.

11 / 23

SLIDE 32

DM inactive versus active

Mean intensities 44.4% vs. 40.8%. Regions of relatively homogeneous intensity. Speckle contrast ratios 8.7% vs. 3.8%.

DM active: Intensity ×90%; SCR ×50% (approximately.)

11 / 23

SLIDE 33

Lightguide exit face at 0.5 m, DM inactive

12 / 23

SLIDE 34

Lightguide exit face at 0.5 m, DM active: 3 deg

13 / 23

SLIDE 35

Lightguide exit face at 0.5 m, DM active: 5 deg

14 / 23

SLIDE 36

Moving diffuser implementation

“ 2 deg” diffuser at 10,000 rev./min.

15 / 23

SLIDE 37

Moving diffuser implementation

“ 2 deg” diffuser at 10,000 rev./min. LD homogenization and projection apparatus with

ne stationary and one moving “ 2 deg” diffusers.

15 / 23

SLIDE 38

MD versus DM, low gain screen

Mean intensities 30% vs. 47%. SCR 6% (LG length 50 mm.)

DM active: Intensity ×150%; SCR equal (approximately.)

16 / 23

SLIDE 39

MD versus DM, low gain screen

Mean intensities 30% vs. 47%. SCR 6% (LG length 50 mm.)

DM active: Intensity ×150%; SCR equal (approximately.)

16 / 23

SLIDE 40

MD versus DM, high gain metallic 3-D cinema screen

Mean intensities 43% vs. 65%. SCR 16% (LG length 50 mm.)

DM active: Intensity ×150%; SCR equal (approximately.)

17 / 23

SLIDE 41

MD versus DM, high gain metallic 3-D cinema screen

Mean intensities 43% vs. 65%. SCR 16% (LG length 50 mm.)

DM active: Intensity ×150%; SCR equal (approximately.)

17 / 23

SLIDE 42

Multiple LDs, multiple small DMs

Each small DM can have coating optimized for LD wavelength.

18 / 23

SLIDE 43

Multiple LDs, multiple small DMs

Design of 7 × 4.5 × 3 mm3 module with fully integrated electronics. Functional prototype with approx. 6 W damage threshold.

18 / 23

SLIDE 44

Multiple LDs, single large DM

Large DM can have coating optimized for several wavelengths.

19 / 23

SLIDE 45

Multiple LDs, single large DM

Design of 50 × 40 × 10 mm3 module with fully integrated electronics. Functional R,G,B prototype with

approx. 200 W damage threshold.

19 / 23

SLIDE 46

Large DM projection display apparatus.

Incident illumination 25 mm on prototype large DM. Focusing lenses 30 mm, effective f ≈ 30 mm. Lightguides 6 × 8 × 50 mm3 and 6 × 8 × 150 mm3.

20 / 23

SLIDE 47

Large DM projection display apparatus.

Incident illumination 25 mm on prototype large DM. Focusing lenses 30 mm, effective f ≈ 30 mm. Lightguides 6 × 8 × 50 mm3 and 6 × 8 × 150 mm3.

20 / 23

SLIDE 48

Large DM projection display apparatus.

Incident illumination 25 mm on prototype large DM. Focusing lenses 30 mm, effective f ≈ 30 mm. Lightguides 6 × 8 × 50 mm3 and 6 × 8 × 150 mm3.

20 / 23

SLIDE 49

Projected image, 1.4 m diagonal, large DM

DM inactive, LG length 50 mm.

21 / 23

SLIDE 50

Projected image, 1.4 m diagonal, large DM

DM inactive, LG length 50 mm. DM active, LG length 50 mm.

21 / 23

SLIDE 51

Projected image, 1.4 m diagonal, large DM

DM inactive, LG length 50 mm. DM active, LG length 50 mm. DM inactive, LG length 150 mm.

21 / 23

SLIDE 52

Projected image, 1.4 m diagonal, large DM

DM inactive, LG length 50 mm. DM active, LG length 50 mm. DM inactive, LG length 150 mm. DM active, LG length 150 mm.

21 / 23

SLIDE 53

Conclusions

DM “randomized divergence” doesn’t overfill apertures. Image intensity ×150% versus an MD implementation. Homogeneity good but LG artefacts visible with single LD. Speckle contrast ratio equal to MD (at theoretical limit.)

22 / 23

SLIDE 54

Conclusions

DM “randomized divergence” doesn’t overfill apertures. Image intensity ×150% versus an MD implementation. Homogeneity good but LG artefacts visible with single LD. Speckle contrast ratio equal to MD (at theoretical limit.)

22 / 23

SLIDE 55

Conclusions

DM “randomized divergence” doesn’t overfill apertures. Image intensity ×150% versus an MD implementation. Homogeneity good but LG artefacts visible with single LD. Speckle contrast ratio equal to MD (at theoretical limit.)

22 / 23

SLIDE 56

Conclusions

DM “randomized divergence” doesn’t overfill apertures. Image intensity ×150% versus an MD implementation. Homogeneity good but LG artefacts visible with single LD. Speckle contrast ratio equal to MD (at theoretical limit.)

22 / 23

SLIDE 57

Thank You!

23 / 23