Open AccessThermal characteristics of an end-pumped high-power ytterbium-sensitized erbium-doped fiber laser under natural convection
Author(s) -
Yoonchan Jeong,
Seungin Baek,
P. Dupriez,
J.-N. Maran,
J.K. Sahu,
Johan Nilsson,
B. Lee
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.019865
Subject(s) - materials science , fiber laser , fiber bragg grating , optics , ytterbium , laser , core (optical fiber) , slope efficiency , optical fiber , laser power scaling , fiber , erbium , optoelectronics , doping , wavelength , composite material , physics
We investigate the thermal characteristics of a polymer-clad fiber laser under natural convection when it is strongly pumped up to the damage point of the fiber. For this, we utilize a temperature sensing technique based on a fiber Bragg grating sensor array. We have measured the longitudinal temperature distribution of a 2.4-m length ytterbium-sensitized erbium-doped fiber laser that was end-pumped at approximately 975 nm. The measured temperature distribution decreases exponentially, approximately, decaying away from the pump-launch end. We attribute this to the heat dissipation of absorbed pump power. The maximum temperature difference between the fiber ends was approximately 190 K at the maximum pump power of 60.8 W. From this, we estimate that the core temperature reached approximately 236 degrees C.