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Using a modified ABCD matrix approach accounting for nonlinear refraction in active medium, the ranges of cavity parameters that provide a mode locking of Yb∶KYW laser in usual z fold cavity configuration are determined. Taking the cavity parameters that provide a most efficient mode locking and based on fluctuation model, a numerical simulation of laser operation is performed. In the calculations the side band pump power of 6W at 982 nm is used in 1 cm length KYW crystal with 1 cm×0 005 cm beam cross section. Calculations show that self starting operation is possible with these parameters and dispersion compensation allows for bandwidth limited ultrashort pulse generation. The shortest pulse duration was determined to be about 200 fs with self starting buid up time of 130 μs. Such a built up time is comparable and even shorter than that one for the lasers with semiconductor saturable absorbers. The region of negative dispersion provided by prism pair for a stable ultrashort pulse generation was determined to be (-17000～-42000)fs 2.
Using a modified ABCD matrix approach accounting for nonlinear refraction in active medium, the ranges of cavity parameters that provide a mode locking of Yb: KYW laser in usual z fold cavity configuration are. Taking the cavity parameters that provide a most efficient mode locking and based on fluctuation model, a numerical simulation of laser operation is performed. In the calculations the side band pump power of 6W at 982 nm is used in 1 cm length KYW crystal with 1 cm × 0 005 cm beam cross section. Calculations show that self starting operation is possible with these parameters and dispersion compensation allows for bandwidth limited ultrashort pulse generation. The shortest pulse duration was determined to be about 200 fs with self starting buid up time of 130 μs. Such a built up time is is comparable and even shorter than that one for the lasers with semiconductor saturable absorbers. The region of negative dispersion provided by prism pair fo r a stable ultrashort pulse generation was determined to be (-17000 ~ -42000) fs 2.