Phase noise characterization of sub-hertz linewidth lasers via digital cross correlation
Abstract
Phase noise or frequency noise is a key metrics to evaluate the short term stability of a laser. This property is of a great interest for the applications but delicate to characterize, especially for narrow line-width lasers. In this letter, we demonstrate a digital cross correlation scheme to characterize the absolute phase noise of sub-hertz line-width lasers. Three 1,542 nm ultra-stable lasers are used in this approach. For each measurement two lasers act as references to characterize a third one. Phase noise power spectral density from 0.5 Hz to 0.8 MHz Fourier frequencies can be derived for each laser by a mere change in the configuration of the lasers. This is the first time showing the phase noise of sub-hertz line-width lasers with no reference limitation. We also present an analysis of the laser phase noise performance.
Keywords
Cite
@article{arxiv.1703.05983,
title = {Phase noise characterization of sub-hertz linewidth lasers via digital cross correlation},
author = {Xiaopeng Xie and Romain Bouchand and Daniele Nicolodi and Michel Lours and Christophe Alexandre and Yann Le Coq},
journal= {arXiv preprint arXiv:1703.05983},
year = {2017}
}
Comments
4 pages, 5 figures