Open AccessASE in thin disk lasers: theory and experiment
Author(s) -
P. Peterson,
A. Gavrielides,
T.C. Newell,
N. Vretenar,
W. P. Latham
Publication year - 2011
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.19.025672
Subject(s) - optics , amplified spontaneous emission , gain , physics , laser , self pulsation , spontaneous emission , net gain , power (physics) , active laser medium , materials science , laser power scaling , optoelectronics , quantum mechanics , amplifier , cmos
We derive equations for the ASE intensity, decay time, and heat load. The crux of our development is frequency integration over the gain lineshape followed by a spatial integration over the emitters. These integrations result in a gain length that is determined from experiment. We measure the gain as a function of incident pump power for a multi-pass pumped Yb:YAG disk doped at 9.8 at.% with an anti-ASE cap. The incident pump powers are up to 3kW. Our fit to the measured gain is within 10% of the measured gain up to pump powers where the gain starts to flatten out and roll over. In this comparison we extract the gain length that turns out to be 43% of the pump spot size of 7mm.