The nonlinear refractive index n_(2) of Yb~(3+):KY(WO_(4))_(2) crystal has been measured using picosecond Z-scan technique. The magnitude of n_(2) was found to be 8.7×10~(-16) cm~(2)/W at wavelength of 1.08 μm. The numerical modeling based on fluctuation model showed a great potential of this crystal as active medium for Kerr-lens mode-locking.
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