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中文摘要：
基于外腔的高效频率转换,尤其是当系统运行在抽运不消耗近似机理下,信号光可实现大于90%的转换,因此无法通过信号光直接获得其到腔模频率锁定的误差信号.本文通过对信号光调制、和频光解调的方法获得了该误差信号,实现了双波长激光到外腔腔模的级联锁定.实验中外部环形腔将1.3 W的1064 nm抽运光放大到约14.3 W.当1583 nm信号光从10μW变化到50 mW,其到636 nm和频光的转化效率约为73%;当从50 mW变化到295 mW时,转换效率呈线性降低到60%,最终获得了440 mW的636 nm激光.
英文摘要：
In recent years, more than 90% of the signal laser power can be up-converted based on the high-efficiency double resonant external cavity sum-frequency generation（SFG）, especially when the whole system runs under the undepleted pump approximation scheme. Therefore it is difficult to directly achieve an error signal with a high signal-to-noise ratio through the signal laser to lock its frequency to the cavity mode. In this paper a novel method, based on the frequency modulation of signal laser and demodulation of the SFG laser, is used to obtain the error signal to realize the cascade frequency locking between the two fundamental lasers and the external cavity. In this experiment, 1064 nm laser is the pump laser and 1583 nm laser is the signal laser. They are coupled into a ring cavity inside which a 5% Mg O-doped PPLN（25 mm × 1 mm × 0.5 mm） is used to produce the SFG laser of 636 nm. When the pump laser is resonant with the external cavity, a circulating power of 14.3 W is obtained with its input power of 1.3 W. The reflectivity of the input coupling mirror of signal laser is 10% to restrain the impendence mismatch. The temperature of PPLN is set at 68.5？C to reach the optimum SFG temperature. In order to keep the signal laser resonance inside the external cavity, one needs to lock its frequency to the cavity mode. A 28.5 k Hz sinusoidal voltage is used to modulate the frequency of the signal laser so that the frequency of 636 nm laser is modulated simultaneously. Then 5% of the output 636 nm laser power is sent into a Si photodiode detector the signal of which is demodulated at the modulation frequency by a lock-in amplifier.Finally the demodulated signal is feedback to the frequency control port of signal laser. Under these conditions, 73% of1583 nm signal laser power can be converted into 636 nm laser power when the incident power varies from 10 μW to50 mW. However it is rather difficult to maintain a long time resonance between the signal laser and the cavity based on demodulation of the transmit
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