Theoretic Optimization of Supercontinuum Spectral Stability in Bulk Material

The filamentation and supercontinuum generation with femtosecond laser pulse in bulk material were discussed by using variational method. The influences of the supercontinuum bandwidth and spectral stability caused by the length and the relative positions of the medium and lens were discussed. When the input power is several times to that of selffocus threshold, the spectral stability is the best. The result provides the theoretic guidance for obtaining the stabile supercontinuum spectral.