Frequency-noise measurements of optical frequency combs by multiple fringe-side discriminator.

Abstract:

:The frequency noise of an optical frequency comb is routinely measured through the hetherodyne beat of one comb tooth against a stable continuous-wave laser. After frequency-to-voltage conversion, the beatnote is sent to a spectrum analyzer to retrive the power spectral density of the frequency noise. Because narrow-linewidth continuous-wave lasers are available only at certain wavelengths, heterodyning the comb tooth can be challenging. We present a new technique for direct characterization of the frequency noise of an optical frequency comb, requiring no supplementary reference lasers and easily applicable in all spectral regions from the terahertz to the ultraviolet. The technique is based on the combination of a low finesse Fabry-Perot resonator and the so-called "fringe-side locking" method, usually adopted to characterize the spectral purity of single-frequency lasers, here generalized to optical frequency combs. The effectiveness of this technique is demonstrated with an Er-fiber comb source across the wavelength range from 1 to 2 μm.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Coluccelli N,Cassinerio M,Gambetta A,Laporta P,Galzerano G

doi

10.1038/srep16338

subject

Has Abstract

pub_date

2015-11-09 00:00:00

pages

16338

issn

2045-2322

pii

srep16338

journal_volume

5

pub_type

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