Stray light analysis and suppression of broad-band spectral imaging system

Kaiyi Ji; Yujie Xing; Xinshang Niu; Chunling He; Xiong Dun; Xinbin Cheng

doi:10.3788/IRLA20220645

Infrared and Laser Engineering, Volume. 52, Issue 5, 20220645(2023)

Stray light analysis and suppression of broad-band spectral imaging system

Kaiyi Ji^1,2, Yujie Xing^1,2、*, Xinshang Niu^1,2, Chunling He^1,2, Xiong Dun^1,2,3,4, and Xinbin Cheng^1,2,3,4

¹MOE Key Laboratory of Advanced Micro-Structured Materials, Institute of Precision Optical Engineering, Tongji University, Shanghai 200092, China

²School of Physics Science and Engineering, Tongji University, Shanghai 200092, China

³Shanghai Frontiers Science Center of Digital Optics, Shanghai 200092, China

⁴Shanghai Professional Technical Service Platform for Full-Spectrum and High-Performance Optical Thin Film Devices and Applications, Shanghai 200092, China

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Figures & Tables(18)

Fig. 1. Optical path diagram of optical system

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Fig. 2. 3D diagram of a broad band spectral imaging system

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Fig. 3. TracePro software optical simulation process

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$(a) Normalized spectral curve; (b) Detector quantum efficiency curve; (c) Diffraction efficiency curves of grating orders$

Fig. 4. (a) Normalized spectral curve; (b) Detector quantum efficiency curve; (c) Diffraction efficiency curves of grating orders

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Fig. 5. Stray light coefficient of the system

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Fig. 6. (a) Signal light propagation path at 0.8 μm; (b) Stray light propagation path at 0.8 μm

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Fig. 7. Ray tracing at 0.4 μm

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Fig. 8. Sub-area filter

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Fig. 9. Spectrogram of the sub-area filter

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Fig. 10. System stray light coefficient before and after suppression

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Fig. 11. Linear variable bandpass filter

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Fig. 12. Footprint diagram on the front surface of the filter

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Fig. 13. Spectrogram of the linear variable bandpass filter

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Fig. 14. System stray light coefficient before and after suppression

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Table 1. Design parameters of optical system
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Table 1. Design parameters of optical system
Parameter Value
Spectral range 0.4-1.7
F/# 3.2
Spectral sampling interval/nm 2.6
Magnification 1∶1
Slit W×H/mm² 12.8×0.02
Diffraction order k −1

Table 2. Detector characteristic parameters
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Table 2. Detector characteristic parameters
Parameter Value
Detector type InGaAs
Number of pixels 640×512
Spectral response/μm 0.4-1.7
Detector pixel size/μm² 20×20
Quantum efficiency >80% （peak）

Table 3. Theoretical signal energy at normalized light source energy, stray light energy and stray light coefficient

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Table 3. Theoretical signal energy at normalized light source energy, stray light energy and stray light coefficient

Wavelength/ μm	−1 order	−2 order	−3 order	−4 order	Stray light coefficient
1.0	0.1735	0.0011	-	-	0.0063
1.1	0.1502	0.0041	-	-	0.0266
1.2	0.1320	0.0157	0.000019	-	0.1064
1.3	0.1131	0.0383	0.0012	-	0.2588
1.4	0.0922	0.0640	0.0060	-	0.4316
1.5	0.0737	0.0862	0.0134	-	0.5747
1.6	0.0597	0.0979	0.0194	0.0008	0.6642

Table 4. The onset and cutoff wavelengths of the passband at different positions on the filter

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Table 4. The onset and cutoff wavelengths of the passband at different positions on the filter

Location/mm	Onset wavelength/nm	Cutoff wavelength/nm
4.741	430	520
4.461	500	610
3.780	560	700
3.139	630	790
2.497	700	880
1.854	770	970
1.210	840	1060
0.485	900	1140
–0.162	970	1230
–1.133	1040	1320
–1.783	1110	1410
–2.434	1180	1500
–3.128	1260	1590
–3.703	1320	1670
–4.362	1390	1760
–5.068	1470	1 850
–5.348	1500	1 890
–5.668	1540	1 930

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Kaiyi Ji, Yujie Xing, Xinshang Niu, Chunling He, Xiong Dun, Xinbin Cheng. Stray light analysis and suppression of broad-band spectral imaging system[J]. Infrared and Laser Engineering, 2023, 52(5): 20220645

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Paper Information

Category: Optical design

Received: Sep. 8, 2022

Accepted: --

Published Online: Jul. 4, 2023

The Author Email: Xing Yujie (2110692@tongji.edu.cn)

DOI:10.3788/IRLA20220645

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Design parameters of optical system

Table 1. Design parameters of optical system

Table 2. Detector characteristic parameters

Table 2. Detector characteristic parameters

Table 3. Theoretical signal energy at normalized light source energy, stray light energy and stray light coefficient

Table 3. Theoretical signal energy at normalized light source energy, stray light energy and stray light coefficient

Table 4. The onset and cutoff wavelengths of the passband at different positions on the filter

Table 4. The onset and cutoff wavelengths of the passband at different positions on the filter