Abstract

The third-order Kerr nonlinear response in gallium phosphide nanoscale waveguides is measured through continuous-wave (CW) four-wave mixing. The extracted nonlinear coefficient ranges from about 800W1m1 to 1400W1m1, consistently with an estimated material nonlinearity n2=3.5×1018W1m2. The roles of the residual absorption and the related thermal effects are discussed.

© 2019 Optical Society of America

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