Cha M
Opt Lett. 1998 Feb 15;23(4):250-2. doi: 10.1364/ol.23.000250.
I propose a method for enhancing the cascaded phase shift of the fundamental wave associated with second-harmonic generation in aperiodic quasi-phase matched (QPM) gratings. The position and length of one of the domains were varied to maximize the cascaded phase shift. A maximum enhancement of 84% in the cascaded phase shift relative to a perfectly periodic QPM grating was obtained at a moderate fundamental input intensity without initial seeding of the second-harmonic wave. All-optical intensity modulation is also proposed with another optimized aperiodic QPM grating.
我提出了一种用于增强非周期准相位匹配（QPM）光栅中与二次谐波产生相关的基波级联相移的方法。改变其中一个畴的位置和长度，以使级联相移最大化。在适度的基波输入强度下，且无二次谐波波的初始种子注入时，相对于完美周期性QPM光栅，级联相移最大增强了84%。还提出了使用另一种优化的非周期QPM光栅进行全光强度调制。
