Tunable dual-color operation of Yb:fiber laser via mechanical spectral subdivision

Author(s)

Jakob Fellinger, Georg Winkler, Aline Mayer, Laurin Steidle, Oliver H. Heckl

Abstract

We present a versatile method to generate a dual-color laser from a single fiber laser cavity by spectral subdivision using a tunable mechanical filter. As a proof-of-principle, we implement the concept in a nonlinear polarization evolution (NPE)-mode-locked ytterbium (Yb)-fiber laser. The division into two independent spectral regions is achieved by inserting a narrow blade-shaped beam block into the free-space grating compressor section of the cavity, where the spectrum is spatially dispersed. By mode-locking both spectral regions, two pulse trains, with different repetition rates around 23 MHz, are generated. Each pulse train has a FWHM of ~10 nm. The method presented here enables tuning of the difference in repetition rate as well as the spectral separation of the two independent pulse trains. The difference in repetition rates originates from intracavity dispersion and can be tuned over a large range (650 Hz - 3 kHz in this setup) by changing the length of the grating compressor. By changing the effective width of the beam block the spectral separation can be dynamically adjusted. This approach’s simplicity holds great promises for the development of single-cavity dual-comb lasers featuring tunable sampling rates.

Organisation(s)

Faculty Center for Nano Structure Research

Journal

Optics Express

Volume

27

Pages

5478-5486

No. of pages

9

ISSN

1094-4087

DOI

https://doi.org/10.1364/OE.27.005478

Publication date

02-2019

Peer reviewed

Yes

Austrian Fields of Science 2012

103016 Laser physics, 103021 Optics, 103040 Photonics, 103008 Experimental physics

Keywords

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

Portal url

https://ucrisportal.univie.ac.at/en/publications/4e7e9525-ef7a-4e4c-aa1d-2424b1f3a102