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Polarization instabilities in a two-photon laser

Olivier Pfister, William J. Brown, Michael D. Stenner, Daniel J. Gauthier

quant-pharXiv:quant-ph/0103125

Abstract

We describe the operating characteristics of a new type of quantum oscillator that is based on a two-photon stimulated emission process. This two-photon laser consists of spin-polarized and laser-driven 39K atoms placed in a high-finesse transverse-mode-degenerate optical resonator, and produces a beam with a power of 0.2 μW at a wavelength of 770 nm. We observe complex dynamical instabilities of the state of polarization of the two-photon laser, which are made possible by the atomic Zeeman degeneracy. We conjecture that the laser could emit polarization-entangled twin beams if this degeneracy is lifted.

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