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- Title
Low-noise transfer of the spectral purity of an optical comb line using a feedforward scheme.
- Authors
Brochard, Pierre; Rudin, Benjamin; Emaury, Florian; Wittwer, Valentin J.; Schilt, Stéphane; Südmeyer, Thomas
- Abstract
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.
- Subjects
NOISE generators (Electronics); FEEDFORWARD amplifiers; SPECTRUM analysis; LASERS; PHASE noise
- Publication
Journal of the European Optical Society, 2020, Vol 16, Issue 1, p1
- ISSN
1990-2573
- Publication type
Article
- DOI
10.1186/s41476-020-0125-0