# 1.5 μm lasers with sub 10 mHz linewidth

@article{Legero201715L,
title={1.5 $\mu$m lasers with sub 10 mHz linewidth},
author={Thomas Legero and Dan G. Matei and Sebastian H{\"a}fner and Christian Grebing and R. Weyrich and Fritz Riehle and Uwe Sterr and W. Zhang and John M. Robinson and Lindsay Sonderhouse and Eric Oelker and J. Ye},
journal={2017 Conference on Lasers and Electro-Optics (CLEO)},
year={2017},
pages={1-2}
}
• Published 15 February 2017
• Physics
• 2017 Conference on Lasers and Electro-Optics (CLEO)
We report on two ultrastable lasers stabilized to single-crystal silicon Fabry-Pérot cavities at 124 K. The lasers show unprecedented thermal noise-limited frequency instabilities of 4×10<sup>−17</sup> and linewidths below 10 mHz.

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