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利用激光二极管(LD)阵列侧面抽运声光(AO)调Q的Nd∶YAG激光器作为抽运源,研究了在不同声光重复频率和输出镜透过率的情况下,内腔式KTA-光参量振荡器(OPO)的输出特性。通过对单谐振光参量振荡器阈值公式的讨论,采用平凹腔的结构以及较短的腔长,降低了光参量振荡器的振荡阈值。当声光重复频率为4 kHz,输出镜透过率为30%,抽运电流为14.5 A时,光参量振荡器的1570 nm激光输出脉冲峰值功率达到5.6×104W,脉冲宽度为2.5 ns,实验中最大平均输出功率为560.3 mW。结果表明,具有良好热性能的非线性晶体KTA是制造小型、轻便光参量振荡激光器的理想材料。
Using the laser-diode (LD) array to pump the acousto-optic (AO) Q-switched Nd: YAG laser as the pump source, the cavity KTA- Optical parametric oscillator (OPO) output characteristics. Through the discussion of the single resonant optical parametric oscillator threshold formula, using the structure of the flat cavity and the shorter cavity length, the oscillation threshold of the optical parametric oscillator is reduced. When the acousto-optic repetition frequency is 4 kHz, the output mirror transmittance is 30%, and the pumping current is 14.5 A, the peak power of 1570 nm laser output pulse of the optical parametric oscillator reaches 5.6 × 104 W and the pulse width is 2.5 ns. The maximum average output power is 560.3 mW. The results show that KTA with good thermal properties is an ideal material for the fabrication of small, lightweight optical parametric oscillating lasers.