周期极化KTiOPO4中三重符合非线性的观测
Observation of triply coincident nonlinearities in periodically poled KTiOPO4
摘要：
我们报告的同时准相位匹配的所有三种可能的非线性传播沿X轴的周期极化（PP）KTiOPO4（KTP）的二次谐波产生的745 nm脉冲光从1490 nm亚皮秒脉冲在PPKTP晶体与45.65微米的极化周期。这证实了K. Kato和E. Takaoka [Appl.Opt.41，5040（2002）]。这种重合的非线性对于实现多体连续变量纠缠的紧凑源是重要的[Pfister等人，物理评论A 70，020302（2004）]，我们提出了一个新的更简单的方法纠缠四个领域，基于这种三重符合。
英文摘要：
We report the simultaneous quasi-phase-matching of all three possible nonlinearities for propagation along the X axis of periodocally poled (PP) KTiOPO4 (KTP) for second-harmonic generation of 745 nm pulsed light from 1490nm subpicosecond pulses in a PPKTP crystal with a 45.65 micrometer poling period. This confirms the recent Sellmeier fits of KTP by K. Kato and E. Takaoka [Appl. Opt. 41, 5040 (2002)]. Such coincident nonlinearities are of importance for realizing compact sources of multipartite continuous-variable entanglement [Pfister et al., Phys. Rev. A 70, 020302 (2004)] and we propose a new simpler method for entangling four fields, based on this triple coincidence.
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