Optical parametric oscillator at 1.6 μm based on non-critical phase matching RTP crystal
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摘要: 采用非临界相位匹配切割,尺寸4 mm4 mm20 mm的磷酸钛氧铷（RTP）晶体作为非线性光学晶体,进行了半导体激光端面抽运Nd:YAG/RTP的内腔式光参量振荡获得人眼安全激光的实验研究。对比了不同声光调Q重复频率下的信号光输出特性。在10.5 W的抽运功率和15 kHz的重复频率下,获得了最高900 mW的1.62 m人眼安全激光输出,光光转换效率达8.6%。1.62 m信号光和对应的1.06 m基频光的脉冲宽度分别为4.6和8.2 ns。信号光中心波长在1618 nm,谱线宽度小于0.5 nm。Abstract: This paper reports an intra-cavity rubidium titanyl phosphate(RTP) optical parametric oscillator producing the eye-safe light driven by LD end-pumping Nd:YAG laser. A non-critical phase matching RTP crystal with 4 mm4 mm20 mm in size was adopted for nonlinear optics crystal. The signal light output characteristics with different pulse repetition frequencies of Q-switcher were compared. With a diode pump power of 10.5 W and a pulse repetition frequency of 15 kHz, a maximum output power of 900 mW eye-safe laser at 1.62 m were achieved, with a diode to signal conversion efficiency up to 8.6%. The pulse widths for the 1.62 m signal light and 1.06 m fundamental light were about 4.6 and 8.2 ns, respectively. The center wavelength of signal light was about 1618 nm with a line-width less than 0.5 nm.
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