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连续波可调谐中红外相干光源在光谱分析、传感与探测等领域具有重要的应用价值。基于准相位匹配(QPM)的差频产生(DFG)技术是获取高效中红外激光输出的有效途径,其具有结构简单、调谐方便、室温运转和无阈值限制等优点。本文介绍了连续波中红外差频产生激光光源的基本原理及在高转换效率、宽带调谐、多波长运转和系统小型化方面的国内外研究进展,并对多种典型DFG激光系统的设计方案、技术特点和输出性能展开讨论,最后对连续波中红外DFG激光光源的发展前景进行了展望。
Continuous wave tunable mid-infrared coherent light source has important application value in the fields of spectrum analysis, sensing and detection. Differential Frequency Generation (DFG) based on Quasi-Phase Matching (QPM) is an effective way to obtain high efficiency mid-infrared laser output. It has the advantages of simple structure, convenient tuning, room temperature operation and no threshold limit. This paper introduces the basic principle of continuous wave infrared difference frequency generation laser source and the research progress at home and abroad in high conversion efficiency, broadband tuning, multi-wavelength operation and system miniaturization. The design scheme of many typical DFG laser systems, Technical characteristics and output performance are discussed. Finally, the prospect of CW DFIR laser source is prospected.