Generation of picosecond pulses of amplified spontaneous emission by two-photon excitation in GaAs

Abstract
A strong and uniform picosecond amplified-spontaneous-emission (ASE) pulse train was produced by two-photon excitation in GaAs without a resonant cavity. The frequency bandwidth and the power of the ASE were found to depend upon the pumping power density and the length of the GaAs crystal that was pumped.