Tunable dual-comb from an all-polarization-maintaining single-cavity dual-color Yb:fiber laser

Autor(en)

Jakob Fellinger, Aline Mayer, Georg Winkler, Wilfrid Grosinger, Gar-Wing Truong, Stefan Droste, Chen Li, Christoph M. Heyl, Ingmar Hartl, Oliver H. Heckl

Abstrakt

We demonstrate dual-comb generation from an all-polarization-maintaining dual-color ytterbium (Yb) fiber laser. Two pulse trains with center wavelengths at 1030 nm and 1060 nm respectively are generated within the same laser cavity with a repetition rate around 77 MHz. Dual-color operation is induced using a tunable mechanical spectral filter, which cuts the gain spectrum into two spectral regions that can be independently mode-locked. Spectral overlap of the two pulse trains is achieved outside the laser cavity by amplifying the 1030-nm pulses and broadening them in a nonlinear fiber. Spatially overlapping the two arms on a simple photodiode then generates a down-converted radio frequency comb. The difference in repetition rates between the two pulse trains and hence the line spacing of the down-converted comb can easily be tuned in this setup. This feature allows for a flexible adjustment of the tradeoff between non-aliasing bandwidth vs. measurement time in spectroscopy applications. Furthermore, we show that by fine-tuning the center-wavelengths of the two pulse trains, we are able to shift the down-converted frequency comb along the radio-frequency axis. The usability of this dual-comb setup is demonstrated by measuring the transmission of two different etalons while the laser is completely free-running.

Organisation(en)

Fakultätszentrum für Nanostrukturforschung

Externe Organisation(en)

Helmholtz-Institute Jena, Thorlabs Crystalline Solutions, Deutsches Elektronen-Synchrotron DESY

Journal

Optics Express

Band

27

Seiten

28062-28074

Anzahl der Seiten

13

ISSN

1094-4087

DOI

https://doi.org/10.1364/OE.27.028062

Publikationsdatum

09-2019

Peer-reviewed

Ja

ÖFOS 2012

103016 Laserphysik, 103021 Optik, 103008 Experimentalphysik

Schlagwörter

ASJC Scopus Sachgebiete

Atomic and Molecular Physics, and Optics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/19865d3c-ea41-47ce-8067-edf9c7c9e8f7