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 800  W−1 m−1 to 1400  W−1 m−1, consistently with an estimated material nonlinearity n2=3.5×10−18  W−1 m2. The roles of the residual absorption and the related thermal effects are discussed.
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