Max-Born-Institute for Nonlinear Optics and Ultrafast Spectroscopy, Berlin, Germany.
Opt Lett. 2013 Sep 1;38(17):3344-6. doi: 10.1364/OL.38.003344.
Low-threshold, efficient optical parametric generation at ~4.64 μm is demonstrated using CdSiP2 nonlinear crystal pumped by 150 ps Raman shifted pump pulses at 1198 nm in noncritical configuration at 1 kHz repetition rate. Maximum single pulse idler energy of 6 μJ and total conversion efficiency of 30% are achieved. Seeding at the signal wavelength with a distributed feedback laser diode enables ~25 fold narrowing of the bandwidths down to ~10 GHz, resulting in a Fourier product of ~1 for the ~100 ps long signal (1615 nm) and idler (4.64 μm) pulses.
采用非临界结构，在 1 kHz 重复率下，用 150 ps 的 Raman 移频泵浦脉冲（1198nm）泵浦 CdSiP2 非线性晶体，实现了阈值低、效率高的4.64μm 光参量产生。获得了 6μJ 的最大单脉冲闲频光能量和 30%的总转换效率。在信号波长处用分布反馈半导体激光器进行种子注入，可将带宽压缩25 倍，至10GHz，从而使100ps 长的信号（1615nm）和闲频光（4.64μm）脉冲的傅里叶乘积接近 1。
