Polarization dependent output spectrum due to a single filament in BK7 glass using focused femtosecond pulses

We present experimental results on the effect of incident beam polarization on the spectral and polarization characteristics of the output spectrum due to a single filament generated in BK7 glass using focused femtosecond laser pulses. It is observed that the spectral characteristics of the output spectrum are different both in the spectral content as well as the peak wavelength of the spectrum due to the two input laser polarizations (linear and circular). The polarization properties of the output spectrum due to a single filament for the two polarizations have also been studied.