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首页> 外文期刊>Journal of atmospheric and solar-terrestrial physics >High spectral resolution test and calibration of an ultra-narrowband Faraday anomalous dispersion optical filter for use in daytime mesospheric resonance Doppler lidar
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High spectral resolution test and calibration of an ultra-narrowband Faraday anomalous dispersion optical filter for use in daytime mesospheric resonance Doppler lidar

机译：用于日中层共振多普勒激光雷达的超窄带法拉第反常色散滤光镜的高光谱分辨率测试和校准

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摘要

We present a high-spectral-resolution test and calibration station for precision measurement of ultra-narrow bandwidth optical filters, and how this is used in the processing of daytime measurements from a resonance Doppler potassium lidar at Arecibo. The test station consists of Doppler-free saturation-absorption spectroscopy coupled with a small free-spectral-range Fabry-Perot etalon, which produces a precise measurement of the filter passband over a range of 20. GHz (40. pm) or more with a resolution of under 2. MHz. This setup is used to measure the bandpass function of a Faraday anomalous dispersion optical filter with a band center at 770. nm and full width at half maximum of about 3.64. GHz (~7.2. pm), which is the principal spectral filter in the Arecibo lidar. This bandpass function is then used to calibrate the Doppler-broadened returns from the K lidar. As the Faraday filter passband is narrow enough, the return lidar signals in both the resonance fluorescence and Rayleigh scattering are affected. We describe a calibration process to deconvolve the measured filter function from the return signals in order to achieve accurate temperature measurements. Our approach is demonstrated with actual lidar measurements.
机译：我们提供了一个高光谱分辨率的测试和校准站，用于超窄带宽光学滤波器的精密测量，以及如何将其用于在Arecibo的共振多普勒钾激光雷达进行的日间测量中。该测试站由无多普勒饱和吸收光谱仪和较小的自由光谱范围Fabry-Perot标准具组成，可对20 GHz（40. pm）或更高范围内的滤波器通带进行精确测量。分辨率低于2 MHz。此设置用于测量法拉第反常色散滤光器的带通功能，该带的中心位于770. nm，半峰全宽约为3.64。 GHz（〜7.2。pm），这是Arecibo激光雷达中的主要频谱滤波器。然后使用该带通功能来校准来自K激光雷达的多普勒增宽的回波。由于法拉第滤波器的通带足够窄，因此共振荧光和瑞利散射中的返回激光雷达信号都会受到影响。我们描述了一种校准过程，用于将测量的滤波器功能与返回信号进行反卷积，以实现准确的温度测量。我们的方法通过实际的激光雷达测量得到了证明。

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