使用带间级联激光器的多外差光谱学
Multiheterodyne spectroscopy using interband cascade lasers
摘要：
虽然中红外辐射可用于识别和量化许多化学物质，但当代宽带中红外光谱系统通常受到大占地面积、移动部件和高功耗的阻碍。在这项工作中，我们演示了多外差光谱使用带间级联激光器，它结合了宽带光谱覆盖率与高光谱分辨率和节能操作。激光器产生高达30 mW的连续波光功率，同时消耗不到0.5 W的电功率。计算相位和定时校正算法用于获得kHz线宽的多外差拍音符和高达30 dB的改善信噪比。通过对低压乙烯进行快速扫频吸收和色散光谱评估，证明了多外差技术的多功能性（C $_2$ H $_4$）是通过从多外差信号中提取单个拍音而获取的，以及甲烷的宽带多外差光谱（CH $_4$），其利用微秒时间分辨率和240 GHz的瞬时光学带宽的所有可用拍音获取。该技术显示了在中红外操作的便携式和高分辨率固态光谱化学传感器的优异潜力。
英文摘要：
While mid-infrared radiation can be used to identify and quantify numerous chemical species, contemporary broadband mid-IR spectroscopic systems are often hindered by large footprints, moving parts and high power consumption. In this work, we demonstrate multiheterodyne spectroscopy using interband cascade lasers, which combines broadband spectral coverage with high spectral resolution and energy-efficient operation. The lasers generate up to 30 mW of continuous wave optical power while consuming less than 0.5 W of electrical power. A computational phase and timing correction algorithm is used to obtain kHz linewidths of the multiheterodyne beat notes and up to 30 dB improvement in signal-to-noise ratio. The versatility of the multiheterodyne technique is demonstrated by performing both rapidly swept absorption and dispersion spectroscopic assessments of low-pressure ethylene (C$_2$H$_4$) acquired by extracting a single beat note from the multiheterodyne signal, as well as broadband multiheterodyne spectroscopy of methane (CH$_4$) acquired with all available beat notes with microsecond temporal resolution and an instantaneous optical bandwidth of 240 GHz. The technology shows excellent potential for portable and high-resolution solid state spectroscopic chemical sensors operating in the mid-infrared.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
