11.4μm外腔宽调谐量子级联激光器研究

Research on broadly tuning external cavity quantum cascade laser of 11.4μm

光谱法是目前最主要的痕量气体检测手段之一。外腔量子级联激光器因其宽调谐、窄线宽、中红外波段输出等特点成为痕量检测系统中的重要激光光源。针对有毒有害大气污染物检测需求,采用新型Littrow外腔技术,实现中心波长11.4μm中红外波段827.7cm-1~928.7cm-1(波长10.7μm^12.08μm)宽调谐激光输出,线宽小于1cm-1。该波段的宽调谐激光输出是国内首次报道,解决了三氯乙烯、光气、萘等痕量有毒有害气体同时在线检测的难题。

Spectroscopy was one of the most important methods for trace gas detection.External cavity quantum cascade laser(EC-QCL)had become an important laser light source in trace detection system.Because the output of the laser was broadly tuning,narrowly line width,and mid-infrared band.For on-line detection of toxic and harmful atmospheric pollutants,Littrow outer cavity technology was used to realize the laser center-wavelength of 11.4μm broadly tuning 827.7 cm-1~928.7cm-1(10.7μm^12.08μm)in the mid-infrared band,and the line width less than 1cm-1.The narrowly line width and broadly tuning laser output in this band is the first reported in China.The laser solves the problem of simultaneous on-line detection of trace toxic and harmful gases such as trichloroethylene,phosgene and naphthalene.