High speckle reduction rate in a laser projection system

Yue-Xun Song; Jui-Wen Pan

doi:10.1364/AO.440417

Applied Optics
Vol. 60,
Issue 34,
pp. 10564-10569
(2021)
•https://doi.org/10.1364/AO.440417

High speckle reduction rate in a laser projection system

Yue-Xun Song and Jui-Wen Pan

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Yue-Xun Song and Jui-Wen Pan, "High speckle reduction rate in a laser projection system," Appl. Opt. 60, 10564-10569 (2021)

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Abstract

In this paper, we demonstrate a design for a laser picoprojector with a high rate of reduction in the speckle contrast value. The method utilizes a holographic diffuser, deformable mirror, and fast electrically tunable (FET) lens. Then we compare the reduction rate of the speckle contrast value for holographic diffusers with different divergence angles and an FET lens with different optical power ranges combined with a deformable mirror. The increase in reduction rate of speckle contrast value means that the minimum value of the speckle can be reached faster. There reduction rate increases from 4.76 to 5.74 for the ${{5}} \times {{5}}$ holographic diffuser, 3.45 to 5.66 for the ${{10}} \times {{10}}$ holographic diffuser, and 1.52 to 4.58 for the ${{30}} \times {{30}}$ holographic diffuser.

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Data Availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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	Direction of Laser Beam (degrees)
Optical Power of FET Lens	Range of $x$ Axis (Max Error)	Range of $y$ Axis (Max Error)
0–1D	1.28–3.05 (0.27)	1.34–2.41 (0.17)
0–2D	1.16–2.98 (0.29)	1.25–2.28 (0.21)
0–3D	1.12–2.95 (0.32)	1.19–2.22 (0.26)
$- 1 - 3 D$	1.23–2.55 (0.36)	1.37–2.1 (0.32)
$- 2 - 3 D$	1.19–3.11 (0.37)	1.43–2.54 (0.34)

Optical Power of FET Lens	Divergence Angle of Holographic Diffuser
Optical Power of FET Lens	$5 \times 5$	$10 \times 10$	$30 \times 30$
0–1D	5.35	5.14	4.41
0–2D	5.59	5.24	4.47
0–3D	5.64	5.5	4.54
$- 1 - 3 D$	5.66	5.52	4.56
$- 2 - 3 D$	5.74	5.56	4.58

	Divergence Angle of Holographic Diffuser
Component	$5 \times 5$	$10 \times 10$	$30 \times 30$
Deformable mirror [19]	4.76	3.45	1.52
Deformable mirror + FET lens ( $- 2 - 3 D$ )	5.74	5.66	4.58

	Direction of Laser Beam (degrees)
Optical Power of FET Lens	Range of $x$ Axis (Max Error)	Range of $y$ Axis (Max Error)
0–1D	1.28–3.05 (0.27)	1.34–2.41 (0.17)
0–2D	1.16–2.98 (0.29)	1.25–2.28 (0.21)
0–3D	1.12–2.95 (0.32)	1.19–2.22 (0.26)
$- 1 - 3 D$	1.23–2.55 (0.36)	1.37–2.1 (0.32)
$- 2 - 3 D$	1.19–3.11 (0.37)	1.43–2.54 (0.34)

Optical Power of FET Lens	Divergence Angle of Holographic Diffuser
Optical Power of FET Lens	$5 \times 5$	$10 \times 10$	$30 \times 30$
0–1D	5.35	5.14	4.41
0–2D	5.59	5.24	4.47
0–3D	5.64	5.5	4.54
$- 1 - 3 D$	5.66	5.52	4.56
$- 2 - 3 D$	5.74	5.56	4.58

Abstract

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Applied Optics