Investigation of the Kerr-lens mode locking ability of Cr~(2+): ZnSe solid-state laser

摘要

The theoretical calculation for nonlinear refractive index n_2 in Cr~(2+): ZnSe - active medium predicts the strong defocusing cascaded second-order nonlinearity within 2 - 3!!m spectral range. On the basis of this result the optimal cavity configuration for Kerr-lens mode locking is proposed that allows to achieve a sub-100 fs pulse duration. The numerical simulations testify about strong destabilizing processes in the laser resulting from a strong self-phase modulation. The stabilization of the ultrashort pulse generation is possible due to spectral filtering that increases the pulse duration up to 300 fs.