Abstract

We report the simultaneous quasi-phase-matching of all three possible nonlinearities for propagation along the X axis of periodically poled (PP) ${\mathrm{KTiOPO}}_4$ (KTP) for second-harmonic generation of 745 nm pulsed light from 1490 nm subpicosecond pulses in a PPKTP crystal with a $45.65\mu \mathrm{m}$ 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

Observation of triply coincident nonlinearities in periodically poled KTiOPO4

Raphael C. Pooser and Olivier Pfister
Opt. Lett. 31(1) 128-128 (2006)

Source of polarization entanglement in a single periodically poled KTiOPO₄ crystal with overlapping emission cones

Marco Fiorentino, Christopher E. Kuklewicz, and Franco N. C. Wong
Opt. Express 13(1) 127-135 (2005)

Efficient third-harmonic generation in partly periodically poled KTiOPO₄ crystal

Xiaodong Mu and Yujie J. Ding
Opt. Lett. 26(9) 623-625 (2001)

Broadband nondegenerate optical parametric amplification in the mid infrared with periodically poled KTiOPO₄

A. Fragemann, V. Pasiskevicius, and F. Laurell
Opt. Lett. 30(17) 2296-2298 (2005)

3 dB squeezing by single-pass parametric amplification in a periodically poled KTiOPO₄ crystal

T. Hirano, K. Kotani, T. Ishibashi, S. Okude, and T. Kuwamoto
Opt. Lett. 30(13) 1722-1724 (2005)