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Proceedings Paper

Design of transverse Nd doping profiles in transparent YAG ceramics for edge-pumped laser geometries
Author(s): Jeffrey A. Wisdom; Romain Gaume; Roger Route; Yan Lin Aung; Akio Ikesue; Robert L. Byer
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Paper Abstract

Edge-pumping Nd:YAG laser gain media is a convenient method to couple pump power into a laser cavity. A difficulty with this geometry is that for uniformly doped materials, pump power deposited near the edge of the gain medium cannot be efficiently extracted by a diffraction-limited beam. However, ceramic Nd:YAG with smooth changes in neodymium doping level (doping profiles) can now be fabricated to ameliorate this problem. A slab engineered with a doping profile that has a higher concentration of Nd in the center, and less at the edges, would allow more pump power to be efficiently extracted by a diffraction-limited laser beam. Yet this solution poses its own problem because variations in Nd concentration introduce optical path length distortions that can significantly reduce beam quality. The variations in optical path length are predominantly from changes in the refractive index of the host due to Nd doping and spatially varying temperatures. A genetic-algorithm-based approach is presented that balances improvement in mode-overlap between excited state distribution and the signal laser beam against optical path length distortions. A doping profile was found for an edge-pumped, zig-zag slab amplifier that is expected to yield a 39% improvement in extracted power delivered into a diffraction-limited spot compared to a uniformly doped slab.

Paper Details

Date Published: 14 February 2008
PDF: 12 pages
Proc. SPIE 6871, Solid State Lasers XVII: Technology and Devices, 68711I (14 February 2008); doi: 10.1117/12.784319
Show Author Affiliations
Jeffrey A. Wisdom, Stanford Univ. (United States)
Romain Gaume, Stanford Univ. (United States)
Roger Route, Stanford Univ. (United States)
Yan Lin Aung, World-Lab Co., Ltd. (Japan)
Akio Ikesue, World-Lab Co., Ltd. (Japan)
Robert L. Byer, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 6871:
Solid State Lasers XVII: Technology and Devices
W. Andrew Clarkson; Norman Hodgson; Ramesh K. Shori, Editor(s)

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