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Proceedings Paper

Ground State Depleted Laser Experiments
Author(s): R. Beach; R. Solarz; S. Mitchell; L. Brewer; S. Weinzapfel
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Paper Abstract

Ground state depleted (GSD) lasers have been described in an earlier paper as room temperature, four-level, high energy density lasers with uniform gain when pumped either transversely or longitudinally. Spectroscopic measurements have been performed at Livermore in various Nd doped glass and crystalline materials to extract parameters (stark resolved emission spectra, branching ratios, fluorescence lifetimes, and stimulated emission cross sections) important to the design of a GSD laser. This study has allowed us to identify several systems amenable to experimental demonstration. The results of a demonstration in one of these systems consisting of a sample of Nd doped Y2Si05 which is pumped by a flash lamp pumped dye laser will be presented. Measurements are made to document the degree to which the ground state of the laser has been depleted. An important problem present in GSD lasers, illustrated by the results of our demonstration, is holding off the gain of the Nd 4F3/2 - 4I11/2 transition which typically has an emission cross section 5 to 10 times larger than the desired 4F3/2 - 4I11/2 transition cross section. Several possible techniques for holding off the 4F3/2 - 4I 11/2 transition are discussed. These techniques include segmented laser designs, and the co-doping of laser samples with elements having a large absorption cross section in the 1.06 micron region while being relatively free of absorption in the 0.92 micron region of the spectrum. A system based on Y2SiO5 and co-doped with Nd and Sm will be presented as an example of the latter type GSD design along with available experimental results.

Paper Details

Date Published: 6 July 1989
PDF: 15 pages
Proc. SPIE 1040, High Power and Solid State Lasers II, (6 July 1989); doi: 10.1117/12.951172
Show Author Affiliations
R. Beach, Lawrence Livermore National Laboratory (United States)
R. Solarz, Lawrence Livermore National Laboratory (United States)
S. Mitchell, Lawrence Livermore National Laboratory (United States)
L. Brewer, Lawrence Livermore National Laboratory (United States)
S. Weinzapfel, Lawrence Livermore National Laboratory (United States)

Published in SPIE Proceedings Vol. 1040:
High Power and Solid State Lasers II
George Dube, Editor(s)

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