Spectral Characteristics of Ultrashort Pulses in Kerr-lens Mode-Locked Lasers
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A number of factors that influence spectral position of the femtosecond pulse in a Kerr-lens modelocked Cr:LiSGaF laser have been identified: high-order dispersion, gain saturation, reabsorption from the ground state, and stimulated Raman scattering. Using the one-dimensional numerical model for the simulation of the laser cavity, the relative contributions of different factors have been compared. The Raman effect provides the largest self-frequency shift from the gain peak (up to 60 nm), followed by the gain saturation (25 nm), while the high-order dispersion contribution is insignificant (5 nm). Comparison with the experimental data confirm that the stimulated Raman scattering is a main cause of the ultrashort pulse self-frequency shift observed in Cr:LiSGaF and Cr:LiSAF lasers
13 pages, 8 figures, 3 tables, LaTeX2e, spie.sty, psfig.sty
13 pages, 8 figures, 3 tables, LaTeX2e, spie.sty, psfig.sty