Diffraction Stray Light Analysis and Elimination of VIS-IR Imaging Spectrometer Based on Multi-Zone Grating

Xinhua Chen; Bicen Li; Jiacheng Zhu; Zhicheng Zhao; Weimin Shen

doi:10.3788/AOS202141.1822003

Acta Optica Sinica, Volume. 41, Issue 18, 1822003(2021)

Diffraction Stray Light Analysis and Elimination of VIS-IR Imaging Spectrometer Based on Multi-Zone Grating

Xinhua Chen^1,2、*, Bicen Li³, Jiacheng Zhu^1,2, Zhicheng Zhao^1,2, and Weimin Shen^1,2

¹Key Lab of Modern Optical Technologies of Education Ministry of China, School of Optoelectronic Science and Engineering, Soochow University, Suzhou, Jiangsu 215006, China

²Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province, School of Optoelectronic Science and Engineering, Soochow University, Suzhou, Jiangsu 215006, China

³Beijing Institute of Space Mechanics & Electricity, Beijing 100190, China;

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Figures & Tables(14)

Fig. 1. Optical layouts of VIS-IR imaging spectrometer. (a) Front view; (b) side view

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Fig. 2. Schematic of multi-zone grating

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$Diffraction efficiency of multi-zone grating. (a) VIS-NIR grating; (b) IR grating$

Fig. 3. Diffraction efficiency of multi-zone grating. (a) VIS-NIR grating; (b) IR grating

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Fig. 4. LightTools analysis model

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Fig. 5. Schematic of order-sorting filter. (a) VIS-NIR channel; (b) IR channel

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$Illuminations of different diffraction light in image plane of VIS-NIR channel. (a) -1 order diffraction light of VIR-NIR grating; (b) -2 order diffraction light of IR grating; (c) -3 order diffraction light of IR grating$

Fig. 6. Illuminations of different diffraction light in image plane of VIS-NIR channel. (a) -1 order diffraction light of VIR-NIR grating; (b) -2 order diffraction light of IR grating; (c) -3 order diffraction light of IR grating

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Fig. 7. Reflectance curve of coating

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$Illuminations of different diffraction light in image plane of VIR-NIR channel after stop coating. (a) -1 order diffraction light of VIS-NIR grating; (b) -2 order diffraction light of IR grating; (c) -3 order diffraction light of IR grating$

Fig. 8. Illuminations of different diffraction light in image plane of VIR-NIR channel after stop coating. (a) -1 order diffraction light of VIS-NIR grating; (b) -2 order diffraction light of IR grating; (c) -3 order diffraction light of IR grating

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Table 1. Main parameters of system
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Table 1. Main parameters of system
Parameter Value
VNIR IR
Spectral range /nm 400--1000 1000--5000
Spectral resolution /nm 3.6 9.6
F 6 3
Slit length /mm 10

Table 2. Chief ray position at each diffraction order in image plane of VIS-NIR channel

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Table 2. Chief ray position at each diffraction order in image plane of VIS-NIR channel

Wavelength /μm	Chief ray position /mm
Wavelength /μm	N₁=-1	N₁=-2	N₁=-3	N₂=-1	N₂=-2	N₂=-3	N₂=-4
0.4	0	3.33	6.67	-2.13	-0.93	0.27	1.48
0.55	1.25	5.83	10.43	-1.68	-0.03	1.63	3.28
0.70	2.50	8.34	14.19	-1.23	0.88	2.98	5.09
0.85	3.75	10.84	17.97	-0.78	1.78	4.33	6.89
1.00	5.00	13.36	21.78	-0.33	2.68	5.69	8.70

Table 3. Chief ray position at each diffraction order in image plane of IR channel

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Table 3. Chief ray position at each diffraction order in image plane of IR channel

Wavelength /μm	Chief ray position /mm
Wavelength /μm	N₁=-1	N₁=-2	N₁=-3	N₂=-1	N₂=-2	N₂=-3	N₂=-4
1.00	0	2.99	5.98	8.98	11.98	5.30	13.61
2.00	3.00	8.99	14.99	21.03	25.61	13.62	30.57
3.00	5.99	15.00	24.08	33.54	-	21.99	-
4.00	8.99	21.04	33.54	-	-	30.57	-
5.00	11.99	27.17	47.72	-	-	40.36	-

Table 4. Analytical results for diffraction stray light in image plane of VIR-NIR channel

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Table 4. Analytical results for diffraction stray light in image plane of VIR-NIR channel

Diffraction order	Illumination /(W·mm^-2)
Diffraction order	Wavelengthof 1.00 μm	Wavelengthof 0.85 μm	Wavelengthof 0.70 μm	Wavelengthof 0.55 μm	Wavelengthof 0.40 μm
-1 order of VIS-NIR grating	1.73×10^-5	2.84×10^-5	2.83×10^-5	3.23×10^-5	1.96×10^-5
-1 order of IR grating	1.18×10^-7	1.17×10^-7	9.45×10^-8	1.27×10^-7	1.44×10^-7
-2 order of IR grating	4.70×10^-8	5.71×10^-8	1.83×10^-5	6.83×10^-6	3.56×10^-5
-3 order of IR grating	2.49×10^-5	1.26×10^-5	3.02×10^-5	2.66×10^-5	1.22×10^-7
-4 order of IR grating	9.58×10^-6	6.99×10^-7	5.92×10^-6	1.28×10^-7	9.62×10^-9
Total illumination caused by IR grating	3.47×10^-5	1.36×10^-5	5.45×10^-5	3.37×10^-5	3.59×10^-5
Diffraction stray light coefficient	200.53%	47.64%	192.24%	104.28%	183.46%

Table 5. Distance between -1 order diffraction light spot of VIR-NIR grating and -3 order diffraction light spot of IR grating on detector window glass
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Table 5. Distance between -1 order diffraction light spot of VIR-NIR grating and -3 order diffraction light spot of IR grating on detector window glass
Wavelength /μm 0.40 0.55 0.70 0.85 1.00
Distance /mm 0.120 0.233 0.340 0.450 0.555
Maximum bandwidth /nm 42.1 69.22 94.9 121.3 146.5

Table 6. Analytical results for diffraction stray light in image plane of VIS-NIR channel after stop coating

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Table 6. Analytical results for diffraction stray light in image plane of VIS-NIR channel after stop coating

Diffraction order	Illumination /(W·mm^-2)
Diffraction order	Wavelengthof 0.40 μm	Wavelengthof 0.55 μm	Wavelengthof 0.70 μm	Wavelengthof 0.85 μm	Wavelength of 1.00 μm
-1 order of VIS-NIR grating	3.11×10^-5	3.55×10^-5	3.35×10^-5	3.11×10^-5	1.41×10^-5
-1 order of IR grating	0	4.85×10^-9	1.36×10^-8	1.39×10^-8	8.70×10^-9
-2 order of IR grating	8.14×10^-8	9.25×10^-9	8.55×10^-9	2.34×10^-8	2.08×10^-8
-3 order of IR grating	4.82×10^-10	4.88×10^-8	8.81×10^-8	2.36×10^-8	6.08×10^-9
-4 order of IR grating	0	4.42×10^-14	1.03×10^-8	1.09×10^-12	4.40×10^-8
Total illumination caused by IR grating	8.19×10^-8	6.29×10^-8	1.21×10^-7	6.10×10^-8	7.97×10^-8
Diffraction stray light coefficient	0.26%	0.18%	0.36%	0.19%	0.57%

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Xinhua Chen, Bicen Li, Jiacheng Zhu, Zhicheng Zhao, Weimin Shen. Diffraction Stray Light Analysis and Elimination of VIS-IR Imaging Spectrometer Based on Multi-Zone Grating[J]. Acta Optica Sinica, 2021, 41(18): 1822003

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Paper Information

Category: Optical Design and Fabrication

Received: Mar. 12, 2021

Accepted: Apr. 12, 2021

Published Online: Sep. 3, 2021

The Author Email: Chen Xinhua (xinhua_chen@suda.edu.cn)

DOI:10.3788/AOS202141.1822003

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Main parameters of system

Table 1. Main parameters of system

Table 2. Chief ray position at each diffraction order in image plane of VIS-NIR channel

Table 2. Chief ray position at each diffraction order in image plane of VIS-NIR channel

Table 3. Chief ray position at each diffraction order in image plane of IR channel

Table 3. Chief ray position at each diffraction order in image plane of IR channel

Table 4. Analytical results for diffraction stray light in image plane of VIR-NIR channel

Table 4. Analytical results for diffraction stray light in image plane of VIR-NIR channel

Table 5. Distance between -1 order diffraction light spot of VIR-NIR grating and -3 order diffraction light spot of IR grating on detector window glass

Table 5. Distance between -1 order diffraction light spot of VIR-NIR grating and -3 order diffraction light spot of IR grating on detector window glass

Table 6. Analytical results for diffraction stray light in image plane of VIS-NIR channel after stop coating

Table 6. Analytical results for diffraction stray light in image plane of VIS-NIR channel after stop coating