Intrinsic linewidth of quantum cascade laser frequency combs
Optics
2015-11-18 v1
Abstract
The frequency noise power spectral density of a free-running quantum cascade laser frequency comb is investigated. A plateau is observed at high frequencies, attributed to the quantum noise limit set by the Schawlow-Townes formula for the total laser power on all comb lines. In our experiment, a linewidth of 292 Hz is measured for a total power of 25 mW. This result proves that the four-wave mixing process, responsible for the comb operation, effectively correlates the quantum noise of the individual comb lines.
Cite
@article{arxiv.1506.06262,
title = {Intrinsic linewidth of quantum cascade laser frequency combs},
author = {Francesco Cappelli and Gustavo Villares and Sabine Riedi and Jerome Faist},
journal= {arXiv preprint arXiv:1506.06262},
year = {2015}
}
Comments
13 pages, 3 figures