量子光频梳产生实验研究

Research on Experimental Generation of Quantum Optical Frequency Comb

利用中心波长为815nm的锁模飞秒激光的二次谐波抽运单共振同步抽运光学参量振荡器(SPOPO),实现了压缩真空态量子光频梳的产生。通过平衡零拍探测系统,测得0阶超模脉冲的压缩度为3dB,实际压缩度为5.15dB,理论模型得到的压缩度与实验结果吻合良好。理论分析了单共振SPOPO的输出耦合镜透过率、内腔损耗及探测装置效率对压缩度的影响,为优化量子光频梳的实验测量提供了指导。

The generation of squeezed vacuum quantum optical frequency comb is realized from a singly resonant synchronously pumped optical parametric oscillator（SPOPO）pumped by the second harmonic of a mode-locked femtosecond laser with a central wavelength of 815 nm.With the balanced homodyne detection system,the squeezing degree of the zero-order super-mode pulse is 3 dB and the real squeezing degree is 5.15 dB,which indicates that the experimental result is well consistent with that obtained by the theoretical model.The effects of the transmissivity of the output coupling mirror and the loss of the intra-cavity for the singly resonant SPOPO and the efficiency of the detection device on the squeezing degree are theoretically analyzed,which provides a guidance for the optimization of the experimental measurement of the quantum optical combs.