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Conference on Lasers and Electro-Optics

Generation of Continuous-Wave Raman Sidebands through Degenerate and Nondegenerate Intracavity Four-Wave Mixing

Shin-ichi Zaitsu, Totaro Imasaka

Published Jan 1, 2011• 0 citations
Publisher

Abstract

The phase-matched intracavity four-wave mixing is controlled by the total dispersion of the optical cavity. Continuous-wave Raman sidebands are generated through three different pathways depending on the phase-matching conditions.
DOI
10.1364/cleo_at.2011.jthb95

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The generation of a multifrequency continuous-wave laser through stimulated Raman scattering and phase-matched four-wave mixing in a medium-filled optical cavity is demonstrated. Three different quantum pathways for the four-wave mixing, two of them degenerate and one of them nondegenerate, can be excited independently by tuning the intracavity dispersion. The results suggest that phase-matched Raman sidebands were generated on the longer wavelength side as well as on the shorter wavelength side, which can be used for the Fourier synthesis of a train of ultrashort optical pulses.
Phase matching is shown to provide a tunable gate that helps discriminate entangled states of light generated by four-wave mixing (FWM) in optical fibers against uncorrelated photons originating from Raman scattering. Two types of such gates are discussed. Phase-matching gates of the first type are possible in the normal dispersion regime, where FWM sidebands can be widely tuned by high-order dispersion management, enhancing the ratio of the entangled-photon output to the Raman noise. The photon-entanglement gates of the second type are created by dual-pump cross-phase-modulation-induced FWM sideband generation and can be tuned by group-velocity mismatch of the pump fields.