Optical design of a compact and high-transmittance compressive sensing imaging system enabled by freeform optics

Dewen Cheng; Hailong Chen; Tong Yang; Jun Ke; Yang Li; Yongtian Wang

doi:10.3788/COL202119.112202

Chinese Optics Letters, Volume. 19, Issue 11, 112202(2021)

Optical design of a compact and high-transmittance compressive sensing imaging system enabled by freeform optics

Dewen Cheng^1,2, Hailong Chen^1,2, Tong Yang^1,2,3、*, Jun Ke¹, Yang Li^1,2, and Yongtian Wang^1,2,3

Author Affiliations

¹School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China

²Beijing Engineering Research Center of Mixed Reality and Advanced Display, School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China

³Beijing Key Laboratory of Advanced Optical Remote Sensing Technology, School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China

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Figures & Tables(11)

Fig. 1. Sketch of the MIR CS system.

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Fig. 2. FOV coverage of the system. (a) Rectangular FOV. (b) The FOV coverage is rotated. (c) The FOV coverage used in the actual design process.

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Fig. 3. Layout of the system using traditional spherical lenses.

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Fig. 4. MTF plots of the traditional design. (a) Entire system. (b) Objective optics.

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Fig. 5. Design result of the freeform objective system. (a) System layout. (b) MTF plot.

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Fig. 6. Design result of the coaxial relay optics. (a) System layout. (b) MTF plot.

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Fig. 7. Final design result of the MIR CS system using freeform surfaces.

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Fig. 8. MTF plots of MIR CS system using freeform surfaces. (a) Entire system (zoom #1). (b) Freeform objective optics (zoom #2).

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Fig. 9. Cumulative probability curves of tolerance for two zooms. (a) and (b) are the results of the tolerance analysis of zoom #1 for MTF in the x and y directions, respectively. (c) and (d) are the results of the tolerance analysis of zoom #2 for MTF in the x and y directions, respectively.

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Table 1. Comparisons of the Two Systems
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Table 1. Comparisons of the Two Systems
Items Traditional Design New Design
FOV $7.5 ° \times 6 °$ $7.5 ° \times 6 °$
Compression $16 \times$ $16 \times$
Number of elements 11 7
System volume $46 mm \times 220 mm \times 245 mm$ $52 mm \times 156 mm \times 200 mm$
Total transmittance 33.3% 52.1%

Table 2. The Tolerance value

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Table 2. The Tolerance value

Location	Tolerance type	Value
All surfaces in the freeform objective optics and relay optics	DLX (single surface x displacement)	0.02 mm
	DLY (single surface y displacement)	0.02 mm
All surfaces in the freeform objective optics	DLZ (single surface z displacement)	0.02 mm
	DLA (single surface α-tilt)	2 arcmin
	DLB (single surface β-tilt)	2 arcmin
	DLG (single surface γ-tilt)	10 arcmin
	RSE (random RMS surface error)	55 nm
All surfaces in the relay optics	DLA (single surface α-tilt)	1 arcmin
	DLB (single surface β-tilt)	1 arcmin
	DLT (thickness delta)	0.02 mm
	DLF (test plate fit-power)	2 fringes (WL: 546.1 nm)
All lenses in the relay optics	DSX (group x decenter)	0.02 mm
	DSY (group y decenter)	0.02 mm
	BTX (barrel β-tilt)	2 arcmin
	BTY (barrel α-tilt)	2 arcmin
	DLN (refractive index delta)	0.001
	DLV ( $v$ -number delta)	0.004

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Dewen Cheng, Hailong Chen, Tong Yang, Jun Ke, Yang Li, Yongtian Wang, "Optical design of a compact and high-transmittance compressive sensing imaging system enabled by freeform optics," Chin. Opt. Lett. 19, 112202 (2021)

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