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Advances in Optical Sciences Congress

High brightness, tunable diode laser based continuous-wave biphoton source for two photon absorption at 976 nm

Andreas Jechow, Axel Heuer, Ralf Menzel

Published Jan 1, 2009• 0 citations
Publisher

Abstract

A compact all solid state biphoton source based on a frequency doubled diode laser and a PPLN waveguide crystal is presented. More than 1011 photon pairs per second in one transversal mode could be generated.
DOI
10.1364/nlo.2009.jtub21

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A compact all solid state continuous-wave biphoton source, tunable around 488 nm, for quantum spectroscopic applications based on a frequency doubled diode laser system is presented. Copolarized photon pairs in the fundamental transversal mode could be generated at 976 nm by spontaneous parametric down conversion inside a type-0 quasi phase matched periodically poled lithium niobate waveguide crystal with an efficiency of 8-10(-6). A high flux rate greater than 10(7) photon pairs per second has been achieved at pump powers in the muW range resulting in more than 7-10(9) photon pairs/s-mW. Further a detailed investigation of the spectral behavior and the flux rate as a function of the detuning from the degenerated case is presented.
Photon pairs generated by spontaneous parametric down-conversion (SPDC) are essential for a number of quantum-optics experiments. By utilizing periodically poled (PP) waveguide structures high flux rates of biphotons in one transversal mode can be obtained. The biphoton source presented here is explicitly designed for quantum spectroscopic application and is based on a frequency doubled broad area external cavity diode laser (BA-ECDL) that pumps SPDC inside a PPLN waveguide crystal. A time correlated single photon counting device has been used for the correlation measurements.