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报道了一种基于温控倍频KTP晶体的低噪声全固态内腔倍频绿光激光器。实验中,将KTP晶体作为1/4波片,当注入电功率为300W时,控制KTP至19.8℃获得了2.5W连续绿光,其功率不稳定度小于0.9%(10min),相比最差温度点稳定性提高约70%。理论上,从基频纵模偏振态出发,利用Jones矩阵分析了倍频KTP晶体相位延迟对谐振腔纵模振荡的影响,通过调节KTP温度改变相位延迟,有效遏制了基波偏振模耦合从而得到稳定的绿光输出。理论分析与实验结果相均合,这为低噪声全固态内腔倍频绿光激光器提供了一种新的技术途径。
A low-noise all-solid-state double-frequency green laser based on temperature-controlled frequency-doubling KTP crystal is reported. In the experiment, KTP crystal was used as 1/4 wave plate. When the injected power was 300W, 2.5W continuous green light was obtained by controlling KTP to 19.8 ℃, and the power instability was less than 0.9% (10min). Compared with the worst temperature Point stability increased by about 70%. Theoretically, from the fundamental mode polarization state, we use the Jones matrix to analyze the influence of the phase delay of harmonic KTP crystal on the longitudinal mode oscillation of the resonator. By adjusting the KTP temperature and changing the phase delay, we can effectively restrain the fundamental polarization mode coupling Stable green output. The theoretical analysis is in good agreement with the experimental results, which provides a new technical approach for low noise all-solid-state cavity green laser.