Hollow waveguide-miniaturized quantum cascade laser heterodyne spectro-radiometer.
Hollow waveguide-miniaturized quantum cascade laser heterodyne spectro-radiometer.
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DOI：
10.1364/oe.415371
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发表时间：
2021-01
期刊：
影响因子：
3.8
通讯作者：
Iain Robinson;Helen L. Butcher;N. Macleod;D. Weidmann
中科院分区：
文献类型：
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作者：
Iain Robinson;Helen L. Butcher;N. Macleod;D. Weidmann
介绍了一种基于混合光学集成的小型热红外激光外差辐射计。本机振荡器采用953 cm-1(10.5μm)的量子级联激光器。集成是通过在铜衬底上刻入中空波导来实现的，其中缝隙封装的光学组件的位置保持了基本的混合模式耦合。在实验室中对演示器的性能进行了研究，显示出的噪声水平低于理想情况的1.6倍。给出了太阳掩星中二氧化碳和水蒸气的大气高分辨率透射谱。得出了总柱浓度以及测量不确定度，二氧化碳为399.5±2.2ppm，H2O为1066±62ppm。微型激光外差光谱辐射计演示为基于纳卫星的高光谱分辨率热红外大气探测开辟了前景。
A miniature thermal infrared laser heterodyne spectro-radiometer based on hybrid optical integration is demonstrated. A quantum cascade laser emitting at 953 cm-1 (10.5 μm) is used as the local oscillator. Integration is achieved using hollow waveguides inscribed in a copper substrate, with slot-encapsulated optical components positioned to maintain fundamental hybrid mode coupling. The demonstrator performances are studied in the laboratory and show a noise level within 1.6 times of the ideal case. Atmospheric high-resolution transmittance spectroscopy of carbon dioxide and water vapor in solar occultation is demonstrated. The total column concentrations are derived as well as measurement uncertainties, 399.5 ± 2.2 ppm for CO2 and 1066 ± 62 ppm for H2O. The miniature laser heterodyne spectro-radiometer demonstration opens the prospect for nanosatellite-based high spectral resolution thermal infrared atmospheric sounding.