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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Optimization of photon pair generation in dual-element PPKTP waveguide

Oliver Slattery, Lijun Ma, Xiao Hong Tang

Published Aug 20, 2009• 1 citation
Publisher

Abstract

A compact scheme for high-speed frequency doubling and down-conversion on a single dual-element PPKTP waveguide is investigated. Optimal temperature is achieved and photon pair coincidence is observed at over GHz repetition rate with pulsed pump input scheme.
DOI
10.1117/12.831220

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The implementation of a bright frequency correlated photon pairs source based on a PPKTP requires two principal parts: the process of Spontaneous Parametric Down-Conversion SPDC taking into account the quasi-phase-matching conditions and a single-frequency-mode laser source with a Gaussian profile. In this project, a theoretical approach of the SPDC process and the conditions needed to have an intense source of correlated photon pairs source are studied; especially, the process dependence of the temperature of the crystal and the pump wavelength. A single-frequency-mode pump laser source is implemented and focused to a PPKTP crystal. The photon pairs source is characterized spatially, in intensity and frequency. Through this, a bright photon pairs source with a coincidence rate per mW of pump power of 199 +- 1 kHz/mW is obtained, which is at least three times bigger than the rate of coincidences of the SPDC process using a traditional nonlinear crystal as a BBO.