Affiliation:
1. Stanford University
2. Clemson University
3. University of Illinois at Urbana-Champaign
4. Université Laval
Abstract
The focus of this study was the development of a second generation of
fiber lasers internally cooled by anti-Stokes fluorescence. The laser
consisted of a length of a single-mode fiber spliced to fiber Bragg
gratings to form the optical resonator. The fiber was single-moded at
the pump (1040 nm) and signal (1064 nm) wavelengths. Its core was
heavily doped with Yb, in the initial form of CaF2
nanoparticles, and co-doped with Al to reduce quenching and improve
the cooling efficiency. After optimizing the fiber length (4.1 m) and
output-coupler reflectivity (3.3%), the fiber laser exhibited a
threshold of 160 mW, an optical efficiency of 56.8%, and a
radiation-balanced output power (no net heat generation) of 192 mW. On
all three metrics, this performance is significantly better than the
only previously reported radiation-balanced fiber laser, which is even
more meaningful given that the small size of the single-mode fiber
core (7.8-µm diameter). At the maximum output power (∼2 W), the
average fiber temperature was still barely above room temperature
(428 mK). This work demonstrates that with anti-Stokes pumping, it is
possible to induce significant gain and energy storage in a small-core
Yb-doped fiber while keeping the fiber cool.
Funder
J. E. Sirrine Textile
Foundation
Natural Sciences and Engineering Research
Council of Canada
VINNOVA, Sweden Innovation
Agency
Cited by
2 articles.
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