Max-Planck-Institute for Gravitational Physics, Albert-Einstein-Institute, Leibniz Universität Hannover, Hannover, Germany.
Opt Lett. 2011 Sep 1;36(17):3467-9. doi: 10.1364/OL.36.003467.
We report on the observation of high-efficiency frequency doubling of 1550 nm continuous-wave laser light in a nonlinear cavity containing a periodically poled potassium titanyl phosphate crystal (PPKTP). The fundamental field had a power of 1.10 W and was converted into 1.05 W at 775 nm, yielding a total external conversion efficiency of 95±1%. The latter value is based on the measured depletion of the fundamental field being consistent with the absolute values derived from numerical simulations. According to our model, the conversion efficiency achieved was limited by the nonperfect mode matching into the nonlinear cavity and by the nonperfect impedance matching for the maximum input power available. Our result shows that cavity-assisted frequency conversion based on PPKTP is well suited for low-decoherence frequency conversion of quantum states of light.
我们报告了在含有周期性极化磷酸钛氧钾晶体（PPKTP）的非线性腔内观察到 1550nm 连续波激光高效倍频的结果。基频光功率为 1.10W，在 775nm 处转换为 1.05W，总外转换效率为 95±1%。后一个值是基于测量到的基频光的损耗与数值模拟得出的绝对值一致。根据我们的模型，实现的转换效率受到非完美模式匹配进入非线性腔以及最大可用输入功率的非理想阻抗匹配的限制。我们的结果表明，基于 PPKTP 的腔辅助频率转换非常适合光量子态的低退相干频率转换。
