| Issue |
J. Eur. Opt. Soc.-Rapid Publ.
Volume 16, Number 1, 2020
|
|
|---|---|---|
| Article Number | 4 | |
| Number of page(s) | 5 | |
| DOI | https://doi.org/10.1186/s41476-020-0125-0 | |
| Published online | 07 February 2020 | |
Research
Low-noise transfer of the spectral purity of an optical comb line using a feedforward scheme
1
Laboratoire Temps-Fréquence, Institut de Physique, Université de Neuchâtel, CH-2000, Neuchâtel, Switzerland
2
Menhir Photonics AG, Thiersteinerallee 71, CH-4053, Basel, Switzerland
Received:
11
November
2019
Accepted:
27
January
2020
We present a detailed frequency noise analysis of a feedforward scheme used to faithfully transfer the spectral properties of an individual line of an optical frequency comb spectrum to a single-mode laser and in this way indirectly amplify it, which is applicable to any arbitrary comb mode spacing. In contrast to previously reported implementation of the feedforward method for a similar purpose, we present a more thorough noise study, including the measurement of the additive noise of the setup. The reported experimental investigation was performed using two low-noise ultrafast mode-locked lasers with different repetition rates (~ 1 GHz and 250 MHz) and show a faithful transfer of the comb mode frequency noise to the auxiliary laser with a sub-radian additive phase noise integrated from 1 Hz to 1 MHz. We discuss the present limitations of the method that is able to transfer optical comb lines with sub-Hz linewidth and propose simple improvements.
Key words: Feedforward / Optical frequency comb / Frequency noise
© The Author(s) 2020
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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