Observation of Supercontinuum Generation and Darkening Effect in Bro-Silicate Glass under 800 nm Femtosecond Irradiations

In this paper, we report the experimental observations of supercontinuum generation and darkening effect in bro‐silicate glasses under 200 femtosecond pulses at wavelength of 800 nm. The spectrum of supercontinuum emission from the sample is recorded in the UV wavelength range. The length of filamentation or white light and darkening are investigated at different incident laser pulse energies. The begging position of the generated white light and darkening moves inside glass bulk with decreasing of incident pulse energy. The pulse energy threshold for supercontinuum generation and the laser‐induced darkening in this material has been measured. By controlling of the laser‐induced darkening in borosilicate glasses prepares a promising technique for designing optical devices.