In reflection spectroscopy laser light reflected from the sample is studied. We could carry out experiments at temperatures from 1.5 to 300 K and magnetic fields up to 7 T. Laser light sources: broadband femtosecond Ti:Sapphire lasers. Brewster geometry allows to simplify spectra identification and separate determination of radiative width and nonradiative broadening of excitonic resonances in A3B5 quantum wells samples.