Optical Structure Design of 3.93 <bold>μ</bold>m Laser Heterodyne Spectrometer and N<sub>2</sub>O Measurement

Tianmin Zhang; Jun Huang; Yao Huang; Gang Qi; Zihao Yuan; Zhensong Cao; Yinbo Huang; Ruizhong Rao; Xingji Lu

doi:10.3788/CJL230453

Chinese Journal of Lasers, Volume. 50, Issue 14, 1411001(2023)

Optical Structure Design of 3.93 μm Laser Heterodyne Spectrometer and N₂O Measurement

Tianmin Zhang^1,2,4, Jun Huang^2,4, Yao Huang^2,4, Gang Qi^2,3,4, Zihao Yuan^2,3,4, Zhensong Cao^2,4, Yinbo Huang^2,4, Ruizhong Rao^2,4, and Xingji Lu^2,4、*

Author Affiliations

¹School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, Anhui, China

²Key Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei 230031, Anhui, China

³Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, Anhui, China

⁴Advanced Laser Technology Laboratory of Anhui Province, Hefei 230037, Anhui, China

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Figures & Tables(15)

Fig. 1. Schematic diagram of laser heterodyne spectrum measurement

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Fig. 2. Distribution of light beam on photosensitive surface A_T of detector

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Fig. 3. Geometric relationship between FOV of detector and lens

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Fig. 4. Geometric relationship among beam size, beam focus angle and FOV, effective receiving area in detector

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Fig. 5. Flow chart of N₂O column concentration inversion

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Fig. 6. Laser heterodyne spectrometer. (a) Structure diagram; (b) real picture

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Fig. 7. Simulation results of sunlight beam shaping. (a) Structure diagram of sunlight beam shaping; (b) spot diagram of sunlight spot after beam reduction

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Fig. 8. Optimal SNR of systems with different output sunlight spot sizes. (a) Actual measurement results; (b) relation between SNR and output sunlight spot diameter

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Fig. 9. Measurement results of systems with laser and sunlight spot size matching after beam shaping and without beam shaping. (a) SNR; (b) N₂O absorption spectra

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Fig. 10. Laser heterodyne spectral signal and inversion fitting result with laser and sunlight spot matching

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Fig. 11. N₂O apriori profile and inversion results

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Fig. 12. Column concentration measurement and correlation analysis of N₂O. (a) Column concentration measurement results; (b) correlation analysis of column concentration measurement results

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Table 1. Main parameters of 3.93 μm laser heterodyne system
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Table 1. Main parameters of 3.93 μm laser heterodyne system
Parameter Value
Spectral range /cm^-1 2542.9-2545.0
Filter bandwidth /MHz 88
Scan period /s 36
Integration time /ms 30

Table 2. Main parameters of Zemax simulation design

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Table 2. Main parameters of Zemax simulation design

Surface type		Radius /mm	Thickness /mm	Glass	Semi-diameter /mm
OBJ	Standard	Infinity	Infinity	-	0
STO	Standard	Infinity	200.00	CaF₂	2.250
2	Standard	325.4	2.20	-	12.700U
3	Standard	Infinity	1320.155V	CaF₂	12.700U
4	Standard	216.9	2.40	-	12.700U
5	Standard	Infinity	800.00	-	12.700U
IMA	Standard	Infinity	-	-	1.500U

Table 3. Relationship among distance between lenses L₁ and L₂, output sunlight spot diameter, and system SNR
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Table 3. Relationship among distance between lenses L₁ and L₂, output sunlight spot diameter, and system SNR
Distance between L₁ and L₂ /mm Output sunlight spot diameter /mm System SNR
1590.9 2.2 102.2
1490.6 2.5 115.5
1320.2 3.0 162.1
1184.1 3.4 133.9
944.6 4.1 104.4

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Tianmin Zhang, Jun Huang, Yao Huang, Gang Qi, Zihao Yuan, Zhensong Cao, Yinbo Huang, Ruizhong Rao, Xingji Lu. Optical Structure Design of 3.93 μm Laser Heterodyne Spectrometer and N₂O Measurement[J]. Chinese Journal of Lasers, 2023, 50(14): 1411001

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Paper Information

Category: spectroscopy

Received: Jan. 12, 2023

Accepted: Feb. 27, 2023

Published Online: Jul. 10, 2023

The Author Email: Lu Xingji (xjlu@aiofm.ac.cn)

DOI:10.3788/CJL230453

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Main parameters of 3.93 μm laser heterodyne system

Table 1. Main parameters of 3.93 μm laser heterodyne system

Table 2. Main parameters of Zemax simulation design

Table 2. Main parameters of Zemax simulation design

Table 3. Relationship among distance between lenses L1 and L2, output sunlight spot diameter, and system SNR

Table 3. Relationship among distance between lenses L1 and L2, output sunlight spot diameter, and system SNR

Table 3. Relationship among distance between lenses L₁ and L₂, output sunlight spot diameter, and system SNR

Table 3. Relationship among distance between lenses L₁ and L₂, output sunlight spot diameter, and system SNR