Abstract
We present simulation results of second-harmonic generation based on the combination of group-velocity dispersion and phase modulations in a type-I potassium dihydrogen phosphate crystal for a femtosecond ytterbium-doped solid-state laser operating under ultrahigh intensities. We demonstrate numerically that a nearly linear and positive chirp parasitic on the second-harmonic pulse can be used to further compress the second-harmonic duration using an additional pulse compressor. We report the optimized crystal thickness and corresponding second-harmonic properties for generating a second-harmonic pulse near 25 fs.
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