Publications

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

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

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(s)
Faculty Center for Nano Structure Research
External organisation(s)
Helmholtz-Institute Jena, Crystalline Mirror Solutions LLC, Deutsches Elektronen-Synchrotron DESY
Journal
Optics Express
Volume
27
Pages
28062-28074
No. of pages
13
ISSN
1094-4087
DOI
https://doi.org/10.1364/OE.27.028062
Publication date
09-2019
Peer reviewed
Yes
Austrian Fields of Science 2012
Optics, Laser physics, Experimental physics
Keywords
Portal url
https://ucris.univie.ac.at/portal/en/publications/tunable-dualcomb-from-an-allpolarizationmaintaining-singlecavity-dualcolor-ybfiber-laser(19865d3c-ea41-47ce-8067-edf9c7c9e8f7).html