用中心波长为850 nm, 重复频率为76 MHz, 脉宽为130 fs的飞秒脉冲光产生二次谐波, 泵浦TEM01模的同步光学参量振荡器, 实验上获得了TEM01模大约4倍的经典增益, 并给出了理论分析。这是产生高阶模飞秒脉冲光非经典频率梳的重要步骤, 理论预计该增益下可以得到-220 dB的TEM01模脉冲压缩光。

With the ultra-short mode-locked femtosecond pulse at 850 nm, and the repetitionrates of 76 MHz and the pulse width of 130 fs, through a singly resonant synchronously pumped optical parametric oscillator, periodzcally poled potassium titanyl phosphate crystal pumped by the second harmonic can generate about 4 times gain for the spatial mode TEM01.Theoretically the signal gain of the mode TEM00 is higher than that of the mode TEM01 when pumped by the mode TEM00.This is important for the generation of the non-classical frequency combs, for it can generate about -220 dB theoretical squeezing light.