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可调谐单频光参变振荡器是一种非常理想的相干激光光源,具有调谐范围宽、相干性好、效率高和性能稳定可靠的优点,广泛应用于激光干涉计量、差分吸收雷达、光谱分析、光电对抗和生物医疗等各个领域。但是基于准相位匹配的普通光学参变振荡器由于宽的光参量增益和高功率抽运往往是多纵模运转,需要采用多种选频方法[种子注入、光栅及法布里珀罗(FP)标准具]或者利用光学参变振荡器自身的运转特性(抽运阈值比、热自锁效应及热致光波导效应)来实现单频运转。详细分析了实现可调谐单频光学参变振荡器的各种技术和实验装置。
Tunable single-frequency optical parametric oscillator is a very ideal coherent laser light source, with a wide tuning range, good coherence, high efficiency and stable and reliable performance, widely used in laser interferometry, differential absorption radar, spectral analysis , Photoelectric confrontation and biomedical and other fields. However, the conventional optical parametric oscillators based on quasi-phase matching often require multi-longitudinal mode operation due to their wide optical parametric gain and high power pumping. Various frequency selection methods [seed injection, grating and Fabry-Perot (FP ) Etalon] or use the optical parametric oscillator’s own operational characteristics (pumping threshold ratio, thermal self-locking effect and thermally induced waveguide effect) to achieve single-frequency operation. The various technologies and experimental devices for realizing tunable single-frequency optical parametric oscillator are analyzed in detail.