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In this study, the nature of electronic transport in quantum cascade lasers (QCLs) has been extensively investigated using an ultrafast time-resolved, degenerate, pump-probe optical technique. Our investigations enable a comprehensive understanding of the gain recovery dynamics in terms of a coupling of the electronic transport to the oscillating intracavity laser intensity. In QCLs that have a lasing...
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...
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