Design of an off-axis reflective beam expander for multi-wavelength Raman lidar

Kaifeng Zhang; Xiaoguang Chen; Shengli Sun; Nanchao Wang; Jiang Wu; Jing Yang; Dong Liu

doi:10.1117/12.2625045

27 March 2022 Design of an off-axis reflective beam expander for multi-wavelength Raman lidar

Kaifeng Zhang, Xiaoguang Chen, Shengli Sun, Nanchao Wang, Jiang Wu, Jing Yang, Dong Liu

Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 121697N (2022) https://doi.org/10.1117/12.2625045
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China

Abstract

Lidar has been proven to be a powerful tool for the atmospheric detection due to the advantage of high spatial and temporal resolution. And multi-wavelength lidar can obtain more atmospheric optical properties, which can be inverted to the particle microphysical properties. However, in the multi-wavelength lidar, classical transmission beam expanders of simple structure are difficult to achieve simultaneous beam expansion at multiple wavelengths because of the impact brought by chromatic aberration. To solve this problem, we design an off-axis reflective beam expander with only two spherical mirrors and applied it in the multi-wavelength Raman lidar system. The main parameters of the beam expander have been analyzed in detail and optimized by the Zemax software. And we also design a simple mechanical structure for adjustment of the beam expander which was demonstrated experimentally. According to the receiver field-of-view (FOV), the divergence angle of the emitted laser is less than 0.4 mrad. The experimental results show that the beam expander can be applied well in the multi-wavelength Raman lidar system. Keywords: Off-axis beam expander, Multi-wavelength Raman

Citation Download Citation

Kaifeng Zhang, Xiaoguang Chen, Shengli Sun, Nanchao Wang, Jiang Wu, Jing Yang, and Dong Liu "Design of an off-axis reflective beam expander for multi-wavelength Raman lidar", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 121697N (27 March 2022); https://doi.org/10.1117/12.2625045

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KEYWORDS

Beam expanders

LIDAR

Mirrors

Signal detection

Raman spectroscopy

Off axis mirrors

Reflectivity

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