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Proceedings Paper

Numerical simulating of diode-side-pumped Nd3+:YAG rod laser performance
Author(s): A. J. Abazadze; J. M. Kolbatskov; G. M. Zverev
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Paper Abstract

Previously we carried out experiments with diode-side-pumped Nd 3+:YAG rod lasers with varies configurations of pumping module. All the important output laser characteristics -free-running (FR) and Q-switched (QS) pulse energy, slope and light-to light efficiency, beam divergence were investigated as a functions of diodes parameters, pumping module and a rod geometry, neodymium concentration and resonator configuration. In result of this study we determined an optimal pumping module and resonator parameters witch provide the most effective laser operation. To achieve sufficiently high effective transmission from laser diodes (LD) into a rod we used multy-sectioned pumping modules with four- and eightfold symmetry in which LD's were mounted close-coupled to an active element (AE) (Fig.1 a, b). Really we realized laser free-running operation with slope efficiency of 55% in case of eightfold module geometry and of 45% in case of fourfold one. These results were achieved thanks to high exciting emission density obtained near the central axes of a rod. The same time as a visualization of spontaneous emission showed spatial distribution of inversed population was very nonuniform and it should be a reason of low quality of output beam. Further experimental study of Nd3+:YAG 5-mm-rod laser output in far field showed the possibility to decrease sufficiently a beam divergence of about 2-3 times within negligible losing of slope efficiency despite on gain nonuniformity. This result evidenced that output laser emission spatial distribution in far field depended mainly on the resonator configuration and the slope and the overall efficiencies mainly depended on overlap of the beam and the gain distributions.

Paper Details

Date Published: 4 April 2007
PDF: 4 pages
Proc. SPIE 6610, Laser Optics 2006: Solid State Lasers and Nonlinear Frequency Conversion, 661003 (4 April 2007); doi: 10.1117/12.739816
Show Author Affiliations
A. J. Abazadze, M.F. Stel'makh Polyus Research and Development Institute (Russia)
J. M. Kolbatskov, M.F. Stel'makh Polyus Research and Development Institute (Russia)
G. M. Zverev, M.F. Stel'makh Polyus Research and Development Institute (Russia)

Published in SPIE Proceedings Vol. 6610:
Laser Optics 2006: Solid State Lasers and Nonlinear Frequency Conversion
Vladimir I. Ustyugov, Editor(s)

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