Heng Jiaxing, Liu Pei, Zhang Zhaowei
Opt Lett. 2020 Sep 15;45(18):5085-5088. doi: 10.1364/OL.404580.
We report a chirped-pulse optical parametric oscillator (CPOPO) based on a (KTA) crystal. Due to the relatively low ratio between its second-order and third-order nonlinear susceptibility, a single KTA crystal could provide parametric gain and intra-cavity spectral broadening simultaneously in a CPOPO. Numerical simulations show that a signal-bandwidth of 390 nm can be obtained from a KTA-based CPOPO, and the pulses can be de-chirped with a width of ∼20 outside the OPO cavity. Experimentally, from a fiber-laser-pumped OPO with a 3-mm-long KTA crystal, we obtained a signal wave covering 1332-1667 nm, with a -20 bandwidth of 45.3 THz, around 12 times as much as the gain-bandwidth of the KTA crystal.
我们报道了一种基于磷酸钛氧钾（KTA）晶体的啁啾脉冲光学参量振荡器（CPOPO）。由于其二阶和三阶非线性极化率之间的比值相对较低，单个KTA晶体能够在CPOPO中同时提供参量增益和腔内光谱展宽。数值模拟表明，基于KTA的CPOPO可获得390 nm的信号带宽，并且脉冲在光参量振荡器（OPO）腔外可进行去啁啾处理，脉宽约为20 。实验上，在一个由光纤激光器泵浦、采用3 mm长KTA晶体的OPO中，我们获得了覆盖1332 - 1667 nm的信号波，其 -20带宽为45.3 THz，约为KTA晶体增益带宽的12倍。
