Design of Multi‑Channel Photoelastic Depolarizer for Atmospheric Remote Sensing Detection

Yang Zhao; Jiankang Zhou; Qiao Pan; Weimin Shen

doi:10.3788/AOS250536

Acta Optica Sinica, Volume. 45, Issue 12, 1228010(2025)

Design of Multi‑Channel Photoelastic Depolarizer for Atmospheric Remote Sensing Detection

Yang Zhao^1,2, Jiankang Zhou^1,2、*, Qiao Pan^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 215006, Jiangsu , China

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

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Figures & Tables(14)

Fig. 1. Depolarizer structure based on elastic optical effect

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Fig. 2. Optical path structure of the front objective lens

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Fig. 3. Relationship between peak delay of PEM and residual polarization degree of output light

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Fig. 4. Relationship between polarization angle of incident light and residual polarization degree of outgoing light

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Fig. 5. Relationship between the integration time and residual polarization degree of outgoing light under different peak delay

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Fig. 6. Analysis of the influence of the angle between the optical axes of two PEMs on the depolarization effect. （a） Influence of the optical axis angle on the residual polarization degree；（b） variation trend of residual polarization with integration time under different optical axis angles

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Fig. 7. Relationship between peak delay and residual polarization degree of outgoing light under different wavelengths

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Fig. 8. Relationship between depolarization spectrum width and residual polarization degree of output light

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Fig. 9. Depolarization spectrum width of different center wavelengths under different polarization degree

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Fig. 10. Delay dispersion compensation curve. (a) Curve of dispersion term with wavelength; (b) curve of driving term with wavelength

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Table 1. Indicators of multichannel imaging spectrometers for atmospheric exploration

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Table 1. Indicators of multichannel imaging spectrometers for atmospheric exploration

Spectral channel	1	2	3	4
Center wavelength /nm	760	1610	2060	2355
Spectral range /nm	750‒770	1590‒1670	2040‒2080	2330‒2380
SNR	350	340	230	200
Spatial resolution /km	$\leq$ 3
Orbital altitude /km	834
Effective aperture /mm	45

Table 2. Depolarization degree corresponding to different peak delay deviation
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Table 2. Depolarization degree corresponding to different peak delay deviation
Peak delay deviation /rad d_DOP/%
2.405±0 0
2.405±0.002 99.89
2.405±0.004 99.80
2.405±0.006 99.69
2.405±0.008 99.59
2.405±0.010 99.49

Table 3. Optimum depolarization of each channel can be achieved by compensating the drive item

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Table 3. Optimum depolarization of each channel can be achieved by compensating the drive item

Spectral channel	Spectral range /nm	Spectral band width /nm	Center wavelength /nm	$N_{(λ)}$ /μm^-1	$T_{(V_{0})}$ /（μm·rad）	d_DOP /%
1	750‒770	20	760	4.0450	0.5946	98.30
2	1590‒1670	80	1630	1.8436	1.3045	96.80
3	2040‒2080	40	2060	1.4411	1.6689	98.70
4	2330‒2380	50	2355	1.2480	1.9271	98.65

Table 4. The best depolarization effect that can be achieved after dividing channel 2 into two segments
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Table 4. The best depolarization effect that can be achieved after dividing channel 2 into two segments
Spectral channel Spectral range /nm Spectral band width /nm Center wavelength /nm $N_{(λ)}$ $T_{(V_{0})}$ d_DOP /%
2 1590‒1670 40 1610 1.8674 1.2879 98.40
40 1650 1.8203 1.3212 98.45

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Yang Zhao, Jiankang Zhou, Qiao Pan, Weimin Shen. Design of Multi‑Channel Photoelastic Depolarizer for Atmospheric Remote Sensing Detection[J]. Acta Optica Sinica, 2025, 45(12): 1228010

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Paper Information

Category: Remote Sensing and Sensors

Received: Jan. 22, 2025

Accepted: Feb. 27, 2025

Published Online: Jun. 18, 2025

The Author Email: Jiankang Zhou (health@suda.edu.cn)

DOI:10.3788/AOS250536

CSTR:32393.14.AOS250536

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Indicators of multichannel imaging spectrometers for atmospheric exploration

Table 1. Indicators of multichannel imaging spectrometers for atmospheric exploration

Table 2. Depolarization degree corresponding to different peak delay deviation

Table 2. Depolarization degree corresponding to different peak delay deviation

Table 3. Optimum depolarization of each channel can be achieved by compensating the drive item

Table 3. Optimum depolarization of each channel can be achieved by compensating the drive item

Table 4. The best depolarization effect that can be achieved after dividing channel 2 into two segments

Table 4. The best depolarization effect that can be achieved after dividing channel 2 into two segments