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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• 作者：Jonathan S. Friedman^a ; ^{jonathan@naic.edu} ; Darlene Maldonado-Nieves^a ; Israel Gonzá ; lez^a ; Jens Lautenbach^b ; Xinzhao Chu^c ; John A. Smith^c ; Wentao Huang^c
• 关键词：Resonance Doppler lidar ; Daytime lidar ; Mesosphere ; Faraday filter
• 刊名：Journal of Atmospheric and Solar-Terrestrial Physics
• 出版年：2012
• 期刊代码：41_13646826
• 类别：ear
• 出版时间：May, 2012
• 卷：80
• 期：Complete
• 页码：187-194
• 文件大小：2743 K

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 (鈭?.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.