脉冲量子级联激光器吸收谱扫描方法

Absorption Spectroscopy Scanning Method for Pulsed Quantum Cascade Lasers

针对近年来脉冲量子级联激光器吸收光谱的研究进展,系统地综述了脉冲量子级联激光器吸收光谱扫描方法,如脉间光谱扫描法、脉内光谱扫描法和中脉冲光谱扫描法等,并对这些方法的扫描原理、实现方案、应用场合及存在的问题进行了详细的分析,同时从频率扫描方式、采样带宽和分辨率等角度对这三种扫描方法进行比较。分析指出,最早提出的脉间光谱扫描方法具有操作简单和采样带宽低等特点,依然是今后常规的吸收谱测量方法;中脉冲光谱扫描方法复杂,只是在特定条件下的一种临时的替代方案;而脉内光谱扫描技术具有扫描速度快和光谱分辨率高等优点,将成为未来吸收谱扫描的主要方法。

Based on the recent research progress of the absorption spectroscopy of pulsed quantum cascade lasers,the absorption spectroscopy scanning methods for pulsed quantum cascade lasers are systematically summarized,such as the interpulse spectroscopy scanning method,intrapulse spectroscopy scanning method,intermediate-size pulse spectroscopy scanning method and so on.The scanning principle,implementation,application range and existing problems are analyzed in detail,and the three scanning methods are also compared from the aspects of the frequency scanning mode,sampling bandwidth and resolution.The analysis shows that the earliest proposed interpulse spectroscopy scanning method has the advantages of simple operation and low sampling bandwidth,and remains a conventional absorption spectroscopy scanning method.The intermediatesize pulse spectroscopy scanning method is complex and just a temporary replacement scheme under certain conditions.And the intrapulse spectroscopy scanning method has the advantages of fast scanning speed and higher spectroscopy resolution,and will become the main method of the absorption spectroscopy scanning.