Optical parameter oscillator for extremely pumped alkali vapor lasers
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摘要: 以电光调Q的Nd:YAG激光器为泵浦源，以磷酸氧钛钾（KTP）为非线性晶体，搭建了调谐范围为750~800 nm的光参量振荡器。信号光在中心波长780.2 nm处获得单脉冲能量113 mJ、脉宽15.43 ns、光斑直径5.5 mm的输出。用光栅单色仪测量信号光光谱宽度（FWHM）为0.38 nm。信号光通过120 ℃的铷蒸气池，观察到清晰的荧光轨迹。证明信号光能有效泵浦铷蒸气，可为铷激光器提供峰值功率7 MW的高强度脉冲泵浦源，进而研究铷激光器在高强度泵浦条件下的动力学过程和基础物理机制。Abstract: An optical parameter oscillator (OPO) based on a Nd:YAG laser and two pieces of KTiOPO4 (KTP) nonlinear crystal that could be tuned from 750-800 nm was built for alkali vapor lasers high-intensity pumping experiment. It can provide 113 mJ each pulse at the central wavelength of 780.2 nm with a duration of 15.43 ns. This means the peak power could be as high as 7 MW. The spectral line width is about 0.38 nm and the beam diameter is 5.5 mm. Clear fluorescence can be observed when the signal light passes through the 10 cm long Rb cell with Ar buffer gas at a temperature of 120 ℃, which demonstrates the validity of this OPO system to be used in alkali laser studies.
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