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为解决双波长布里渊激光雷达进行海洋探测用的多波长激光光源的需求,采用四波混频周期极化铌酸锂激光谐振腔与分束光纤圈的理论与技术方法,建立四波混频过程的相位匹配条件与频率匹配条件方程,解决了四波混频频率与波矢的匹配问题,实现了四波混频的发生。具体包括:设计了S型整体光路,研制了信号光480nm四波混频周期极化铌酸锂激光谐振腔,由信号光480nm、闲频光1600nm、泵浦光Ⅰ600nm与泵浦光Ⅱ960nm进入信号光480nm四波混频周期极化铌酸锂激光谐振腔,实现了频率匹配与相位匹配,发生四波混频效应,产生信号光480nm输出,还分别设置分束光纤圈,分别将闲频光1600nm、泵浦光Ⅰ600nm与泵浦光Ⅱ960nm引出并输出,结果:输出了1600nm、600nm、960nm与480nm四波长光纤激光,结论:满足了海洋探测的需求。
In order to solve the need of multiwavelength laser source for dual-wavelength Brillouin Lidar exploration, a four-wave mixing periodic polarization LiNbO3 laser resonator and split optical fiber ring Phase matching condition and frequency matching condition equation of the frequency process, the matching problem of the four-wave mixing frequency and the wave vector is solved, and the occurrence of the four-wave mixing is realized. Specifically includes: S-shaped overall design of the optical path, developed a signal light 480nm four-wave mixing periodic polarization lithium niobate laser cavity, the signal light 480nm, idler 1600nm, pump light I600nm and pump light II960nm into the signal Light 480nm four-wave mixing periodic polarization lithium niobate laser cavity, to achieve the frequency matching and phase matching, the occurrence of four-wave mixing effect, resulting in 480nm output signal light, respectively, set the split optical fiber ring, respectively idler light 1600nm, the pump light I600nm and pump light II960nm leads and outputs, the result: The output of 1600nm, 600nm, 960nm and 480nm four-wavelength fiber laser, the conclusion: to meet the needs of marine exploration.