Open AccessEvaluation of amplified spontaneous emission in thin disk lasers using the spectral linewidth
Author(s) -
Yongqian Chen,
Guangping Zhu,
Hantian Chen,
Mu Wang,
Keming Chen,
Hailin Wang,
А. Б. Козлов,
Xiao Zhu
Publication year - 2019
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.27.012110
Subject(s) - amplified spontaneous emission , laser linewidth , optics , spontaneous emission , laser , materials science , thin disk , optoelectronics , physics , stars , astronomy
Amplified spontaneous emission (ASE) is important to power scaling of the large-scale, high-gain thin disk laser. In this paper, spectral properties of ASE in Yb:YAG thin disk lasers are deeply studied in both theory and experiment. The experimental results show that the ASE strength is much stronger when emitted from the edge surface than the pumping area. And the spectrum of ASE emitted from the coarsened edge surface is angle independent. Meanwhile, the reabsorption effect in the Yb:YAG crystal on spectral linewidth is analyzed and corrected. Finally, ASE spectral linewidths have been measured. We demonstrate that the spectral linewidths can evaluate ASE strength effectively.