Optimization of the referential laser signal to a Fourier transform spectrometer

Huandong Wei; Jianwen Hua; Zuoxiao Dai; Yafei Yuan; Zhanhu Wang; Dayu Li; Xinghui Duan; Xiaoqiang Jin

doi:10.1117/12.835069

28 August 2009 Optimization of the referential laser signal to a Fourier transform spectrometer

Huandong Wei, Jianwen Hua, Zuoxiao Dai, Yafei Yuan, Zhanhu Wang, Dayu Li, Xinghui Duan, Xiaoqiang Jin

Proceedings Volume 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging; 73820W (2009) https://doi.org/10.1117/12.835069
Event: International Symposium on Photoelectronic Detection and Imaging 2009, 2009, Beijing, China

Abstract

The vertical atmospheric sounding interferometer is based on the classical Michelson Interferometer mechanics. To keep the uniformity of the speed and the alignment of the movable plane mirror, it introduces the referential optical path. As the metrological standard, it is very important to get high-quality referential signals. Because of the complexity of the interference system, the referential signals will degenerate when arriving at the laser detectors. In this paper, three factors that impact the quality of the referential signals and countermeasures are presented. Firstly because the laser speckle is not ideally proportioned and the laser beam is not ideally vertically reflected by the movable mirror, the laser speckle swings with the movement of the movable mirror, resulting in the fluctuating of the power radiated on the laser detectors. Secondly, when the initial angle between the fixed mirror and the movable mirror is too large, the modulation depth ripples in a large scale with the small misalignment of the movable mirror. Lastly, the light reflected back to the semiconductor laser will engender impact on the light source. By taking countermeasures, usable, accurate enough referential laser signals are finally acquired.

Citation Download Citation

Huandong Wei, Jianwen Hua, Zuoxiao Dai, Yafei Yuan, Zhanhu Wang, Dayu Li, Xinghui Duan, and Xiaoqiang Jin "Optimization of the referential laser signal to a Fourier transform spectrometer", Proc. SPIE 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, 73820W (28 August 2009); https://doi.org/10.1117/12.835069

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