Xie Xiuping, Huang Jie, Fejer M M
Edward L. Ginzton Laboratory, Stanford University, CA 94305, USA.
Opt Lett. 2006 Jul 15;31(14):2190-2. doi: 10.1364/ol.31.002190.
We demonstrate narrow-linewidth near-degenerate optical parametric generation in reverse-proton-exchange lithium niobate waveguides with quasi-group-velocity-matching, which is realized by using wavelength-selective directional couplers and tight-radius bends. With appropriate designs for 1.6 ps long pump pulses at 785.1 nm we obtained near-degenerate signal (idler) pulses with a time-bandwidth product as low as 1.1, compared with 10.5 for conventional devices without quasi-group-velocity-matching. This improvement in the temporal property is a result of both a pulse compression effect and a filter effect coming from our scheme of quasi-group-velocity-matching.
我们展示了在具有准群速度匹配的反向质子交换铌酸锂波导中实现窄线宽近简并光学参量产生，这是通过使用波长选择性定向耦合器和小半径弯曲来实现的。通过对785.1 nm处1.6 ps长的泵浦脉冲进行适当设计，我们获得了近简并信号（闲频）脉冲，其时带积低至1.1，而对于没有准群速度匹配的传统器件，该值为10.5。时间特性的这种改善是脉冲压缩效应和来自我们的准群速度匹配方案的滤波效应共同作用的结果。
