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International conference on fiber optics and photonics

Analysis of Phase reversed QPM structure for parametric three wave mixing

Toijam Sunder Meetei, Shanmugam Boomadevi, Krishnamoorthy Pandiyan

Published Jan 1, 2014• 0 citations
Publisher

Abstract

We analyze the periodically phase reversed quasi-phase matching structure for efficient parametric three wave mixing process. We present a detailed description to engineer the separation between peaks and efficient parametric three wave mixing.
DOI
10.1364/photonics.2014.t3a.29

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An incomplete period of the last quasi-phase-matching (QPM) segment in a periodically poled nonlinear crystal represents a key problem in implementing a nonlinear wavelength-conversion device with round-trip or oscillating waves of interaction. Such a segment at the crystal end implies broken QPM periodicity for the reflected waves of interaction. We demonstrate numerically that with a grating structure at the crystal end for the reflecting signal the wavelength-dependent phase shift at Bragg reflection can compensate for the phase mismatch of the reflected signal, idler, and pump of an optical parametric process. Therefore, by slightly shifting the signal wavelength we can maintain the phase-matching condition with any length of the last QPM segment. It is shown that with a grating structure the conversion efficiency of the round-trip optical parametric process can always be optimized.