Infrared and Laser Engineering, Volume. 46, Issue 4, 406004(2017)
Highly stable compact intra-cavity continuous-wave optical parametric oscillator
An Intra-cavity Continuous-Wave Optical Parametric Oscillator(IC-OPO) was developed in order to resolve problems inherent in IC-OPO such as instability of output power, long-lived bursts of relaxation-oscillations, etc. First, compensative design of thermal lens effect was devised to improve pattern matching. Second, an aperture slot was used to suppress the oscillations of high-order transverse mode. Finally, by placing a KTP crystal in the cavity for the purpose of SHG, the relaxation oscillation was suppressed by nonlinear loss. After these improvements, the compact tunable infrared to mid-infrared(2.2-4.2 μm) continuous source with high-stability was obtained. The amplitude stability of output power is 0.52%(RMS) and peak-to-peak amplitude stability is less than ±1.8%. The beam quality M2 is 1.72. Especially, a series of observations show that the relaxation-oscillation is suppressed effectively. Without KTP crystal, the threshold (808 nm) is as low as 1.5 W.
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Li Yuxin, Li Shifeng, Ju Panpan, Zhao Gang, Lv Xinjie, Qin Yiqiang. Highly stable compact intra-cavity continuous-wave optical parametric oscillator[J]. Infrared and Laser Engineering, 2017, 46(4): 406004
Category: 激光技术及应用
Received: Aug. 14, 2016
Accepted: Sep. 15, 2016
Published Online: Jun. 30, 2017
The Author Email: Yuxin Li (liyuxinddu@126.com)