Abstract

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 45.65μm 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.

© 2005 Optical Society of America

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