Gain recovery dynamics: femtosecond time resolved spectral hole burning and carrier capture in a separate confinement QW laser structure

Summary form only given. The dynamics of spectral hole burning, gain saturation and carrier capture in the gain region are important in the design of semiconductor lasers and amplifiers; especially in high-speed applications. Using a femtosecond three-pulse white light pump-probe technique, we have clearly observed spectral hole burning. The relaxation of the spectral hole and the gain recovery limited by carrier capture are directly observable in our spatially and temporally resolved experiment. The data are consistent with Monte Carlo simulations.