Gain dynamics in a heterogeneous terahertz quantum cascade laser
Optics
2019-11-19 v1
Abstract
The gain recovery time of a heterogeneous active region terahertz quantum cascade laser is studied by terahertz-pump,i terahertz-probe spectroscopy. The investigated active region, which is based on a bound-to-continuum optical transition with an optical phonon assisted extraction, exhibits a gain recovery time in the range of 34-50ps dependent on the operation condition of the laser. The recovery time gets shorter for stronger pumping of the laser while the recovery dynamics slows down with increasing operation temperature. These results indicate the important role of the intracavity light intensity for the fast gain recovery.
Cite
@article{arxiv.1911.07611,
title = {Gain dynamics in a heterogeneous terahertz quantum cascade laser},
author = {C. G. Derntl and G. Scalari and D. Bachmann and M. Beck and J. Faist and K. Unterrainer and J. Darmo},
journal= {arXiv preprint arXiv:1911.07611},
year = {2019}
}