Observation of triply coincident nonlinearities in periodically poled KTiOPO4.
Observation of triply coincident nonlinearities in periodically poled KTiOPO4.
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DOI：
10.1364/ol.30.002635
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发表时间：
2005-05
期刊：
影响因子：
3.6
通讯作者：
R. Pooser;O. Pfister
中科院分区：
文献类型：
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作者：
R. Pooser;O. Pfister
我们报道了在极化周期为45.65 μ m的PPKTP晶体中，利用1490 nm亚皮秒脉冲产生745 nm脉冲光，在沿X轴沿着传播的三种可能的非线性效应的同时准相位匹配.这证实了Kato和Takaoka最近的Sellmeier适合KTP [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）]，我们提出了一种新的更简单的方法纠缠四个领域的基础上，这种三重符合。
We report the simultaneous quasi-phase-matching of all three possible nonlinearities for propagation along the X axis of periodically poled (PP) KTiOPO4 (KTP) for second-harmonic generation of 745 nm pulsed light from 1490 nm subpicosecond pulses in a PPKTP crystal with a 45.65 microm poling period. This confirms the recent Sellmeier fits for KTP by Kato and 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 on the basis of this triple coincidence.