| Abstract [eng] |
A wide spectrum of laser radiation is useful for two reasons: wider spectrum allows generation of shorter laser pulses, meanwhile, in pump-probe spectroscopy it is prefered to cover the largest possible spectral range with the same source. This work explores white light continuum generation using two-colored (wavelength of 1030 nm and 515 nm) femtosecond laser pulses. Combining these two white light continuums should expand radiation spectrum. However, this research shows that white light continuum generation with two-coloured pulses is not a simple task. Interaction of these two pulses was observed when they overlap in space and time. Conditions for white light continuum generation seems to change. White light continuum generation was investigated in several different cases: when seperatly both pulses do not have enough energy for white light continuum generation, when separatly one of pulses has enough energy for white light continuum generation and when separatly they both have enough energy for white light continuum generation. In all cases pulses interacted. Changes in: sapphire liuminescence track, laser mode image on sapphire after propogation, spectrum and average power after sapphire were captured. Depending on pump energy light suppression or amplification was observed. |
