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Optical frequency shifters based on cascaded second-order nonlinear processes

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Abstract

We propose a novel scheme for an optical frequency shifter that exploits cascaded second-order nonlinearity in a semiconductor material. The cascade comprises a sum-frequency interaction followed by a difference-frequency conversion in a coupled waveguide-to-vertical-cavity structure. For a 50-μm–long planar waveguide, efficient conversion is supported over an effective −3-dB bandwidth of 39 nm at a pump power density of 3.3 W/μm. A longitudinal in-plane cavity can reduce the required pump power density so that effective conversion occurs over a bandwidth of 20 nm at a pump power density of 6 mW/μm.

© 1996 Optical Society of America

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