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Conference on Lasers and Electro-Optics

Slowing and stopping photons using cascaded parametric conversion in QPM waveguides

Jacob B. Khurgin

Published Jan 1, 2005• 0 citations
Publisher

Abstract

A new tunable scheme for slowing down and stopping light using the parametric processes in the phase shifted quasi-phase matched waveguides is proposed and its performance is evaluated.
DOI
10.1109/cleo.2005.201831

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We propose an adiabatic scheme for cascaded fourth-harmonic generation (FHG) in chirped dual-period quasi-phase-matched (QPM) crystals, where adiabatic evolution is introduced into the multi-step frequency conversion process. By engineering two chirped QPM gratings for the fundamental-to-second-harmonic ( FF → SH ) and second-to-fourth-harmonic ( SH → FH ) interactions, efficient harmonic generation is achieved through a continuous adiabatic passage in phase-mismatch space, rather than discrete phase-matching conditions in conventional QPM schemes. This approach enables robust and tunable energy transfer among harmonics, allowing controllable generation of second- and fourth-harmonic signals. Numerical results show a maximum FHG efficiency of 94% and a tunable bandwidth of ∼13 nm under realistic conditions. The tunability originates from the controlled shift of QPM resonances along the propagation direction.