Chinese Journal of Lasers, Volume. 50, Issue 7, 0708012(2023)
Optical System Design of Space-Based Filament LiDAR Spectrometer
Figures & Tables(16)
Fig. 1. Diameter of filament laser after 400 km propagation. (a) Laser pulse width of 50 fs; (b) laser pulse width of 100 fs
Fig. 4. Optical system configuration of spectrometer. (a) X-Z view of integral configuration; (b) X-Y view of integral configuration
Fig. 6. MTF of the spectrometer optical system under different wavelengths. (a) 950 nm; (b) 635 nm; (c) 320 nm
Fig. 7. Energy concentration of the spectrometer optical system under different wavelengths. (a) 320 nm; (b) 630 nm; (c) 950 nm
Fig. 9. Stray light suppression structures. (a) Outer stray light shield; (b) inner stray light suppression structures
Table 1. The number of photons stimulated by filament laser
View tableTable 1. The number of photons stimulated by filament laser
Parameter Value（orbital altitude 400 km） Note Atmospheric density /m-3 2.5×1025 Detection zone background Filament active area /m2 π（3×10-3）2 Simulation result calculation Filament length /km 0.5 Simulation result calculation Ionization rate 0.1% Monopulse excitedphoton yield 1.7×1016
Table 2. The number of photons received by the system (orbital altitude 400 km)
View tableTable 2. The number of photons received by the system (orbital altitude 400 km)
Diameter /m Angle /（°） Solid angle /（°） Photon number 0.2 5×10-7 2×10-13 2.7×102 0.5 1.25×10-6 1.2×10-12 1.6×103 1 2.5×10-6 4.9×10-12 6.6×103 1.5 3.75×10-6 1.1×10-11 1.5×104 2 5×10-6 2.0×10-11 1.9×104
Table 3. Main indexes of the spectrometer system
View tableTable 3. Main indexes of the spectrometer system
Main index Content（20-950 nm） Spectral resolution /nm 2 Linear dispersion /（nm·pixel-1） 0.67 Sampling rate /pixel ~3 Focal length /mm 1750 Diameter /mm 500 F# 3.5 Angle of field 2ω/mrad 0.3 Pixel size /μm 13
Table 4. Main parameters of telescopic optical system
View tableTable 4. Main parameters of telescopic optical system
Mirror Radius /mm Conic coefficient Distance /mm Aperture /mm Primary mirror -1192 -1.002 488.9 500（hole 60 mm） Secondary mirror -247 -1.726 -738.9 73 Folding mirror 70 71×38
Table 5. Spots diagram of telescopic optical system
View tableTable 5. Spots diagram of telescopic optical system
Field of view Spot diagram RMS radius /μm GEO radius /μm (0°, 0°) 14.15 31.3 (0.0050°, 0°) 14.14 31.2 (0.0010°, 0°) 14.15 31.3
Table 6. Structural parameters of the spectrometer system
View tableTable 6. Structural parameters of the spectrometer system
Item Radius /mm Thickness /mm Aperture /mm Decentration /mm Tilt /（°） Collimating mirror 378.81 226.1 22.6×20.72 72.4 6.61 Optical grating 100 22 5 Imaging mirror 1 258.81 130.56 38×23 10.92 18.9 Imaging mirror 2 187.63 133.7 101×50 54.81 18.7
Table 7. Color distortion value of the spectrometer
View tableTable 7. Color distortion value of the spectrometer
Wavelength /nm Color distortion /μm 320 0.9（≈0.06 pixel） 477.5 0.8（≈0.05 pixel） 635 0.9（≈0.06 pixel） 792.5 1.0（≈0.06 pixel） 950 1.1（≈0.07 pixel）
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Xiaolin Liu, Xun Liu, Wei Li, Tingcheng Zhang, Dewei Sun, Li Zhang, Yuhui Lin. Optical System Design of Space-Based Filament LiDAR Spectrometer[J]. Chinese Journal of Lasers, 2023, 50(7): 0708012
Paper Information
Category: nonlinear optics
Received: Dec. 15, 2022
Accepted: Mar. 13, 2023
Published Online: Apr. 14, 2023
The Author Email: Liu Xun (liuxun_laby@163.com)
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