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OCIS codes: (230.4320) Nonlinear optical devices; (070.4550) Correlators; (230.7370) Waveguides.
Abstract:
We present a fiber-coupled balanced optical cross-correlator
using waveguides in periodically-poled KTiOPO4 (PPKTP). The
normalized conversion efficiency of the waveguide device is measured to be
η0 = 1.02% / [W·cm2], which agrees well with theory and simulation. This
result represents an expected improvement of a factor of 20 over previous
bulk-optic devices. The sensitivity of the cross-correlator is characterized
and shown to be comparable to the free-space bulk-optic version, with the
potential for significant performance enhancements in the future.