基于Mie散射的CO<sub>2</sub>激光大气传输特性测量

张合勇; 王挺峰; 邵俊峰; 赵帅; 郭劲

Volume 3 Issue 4

Sep. 2010

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Article Contents

Chinese Optics > 2010 > 3(4): 353-362.

ZHANG He-yong, WANG Ting-feng, SHAO Jun-feng, ZHAO Shuai, GUO Jin. Measurement of CO2 laser atmospheric transmission property based on Mie scattering[J]. Chinese Optics, 2010, 3(4): 353-362.

Citation:

ZHANG He-yong, WANG Ting-feng, SHAO Jun-feng, ZHAO Shuai, GUO Jin. Measurement of CO₂ laser atmospheric transmission property based on Mie scattering[J]. Chinese Optics, 2010, 3(4): 353-362.

ZHANG He-yong, WANG Ting-feng, SHAO Jun-feng, ZHAO Shuai, GUO Jin. Measurement of CO2 laser atmospheric transmission property based on Mie scattering[J]. Chinese Optics, 2010, 3(4): 353-362.

Citation:

ZHANG He-yong, WANG Ting-feng, SHAO Jun-feng, ZHAO Shuai, GUO Jin. Measurement of CO₂ laser atmospheric transmission property based on Mie scattering[J]. Chinese Optics, 2010, 3(4): 353-362.

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Measurement of CO₂ laser atmospheric transmission property based on Mie scattering

State Key Laboratory of Laser Interaction with Matter,Changchun Institute of Optics, Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China

Received Date: 12 Mar 2010
Rev Recd Date: 13 Jun 2010
Publish Date: 25 Aug 2010

Abstract

Abstract

In order to calculate the atmospheric transmittance more correctly, the empirical expression of atmosphere transmittance which should be considered in the design of lidar systems based on Mie theory was analyzed in this paper, and the disadvantage of the empirical expression was demonstrated. In consideration of the merits both the empirical expression and MODTRAN software, they were combined to calculate the atmospheric transmittance. As a result, a modified transmittance expression was achieved. The atmospheric transmittance experiments of CO2 laser were completed under the theory above. The actual results and the theory have some differences without considering the atmosphere turbulence, but there is no impact on the practicability of the theory. The experimental results show that the energy drift ratio of the laser is 6.18% at the output window, and 8.3% and 50.2% at the distances of 50 m and 1000 m, respectively, which means the ratios increase with the enlargement of distance. The main reason of the drift is the atmospheric transmission according to the experimental environments. Excluding the drift ratios at the output window of the CO2 laser, the energy drift ratios are 2.12% and 44.02% at 50 m and 1 000 m, respectively. The experimental results demonstrate that the energy twitter has been so fiercely at 1 000 m, therefore, the adaptive optics compensation is very important in the long-range atmospheric transmission.
- atmosphere transmission,
- Mie scattering,
- MODTRAN software,
- CO2 laser,
- energy drift ratio

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