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Proceedings Paper

Intrinsic limits of the efficiency of 3-μm Er:YAG laser
Author(s): Serban Georgescu; Ovidiu Toma; Horatiu Totia
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Paper Abstract

Mathematical modeling, based on rate equations, is used to estimate the theoretical limits of the emission efficiency of 3-μm Er:YAG laser in various generation regimes. This model uses exclusively spectroscopic data and includes upconversion from both initial (4I11/2) and terminal 4Il3/2) laser levels and cross-relaxation from the 4S3/2 level. The energy transfer processes, very active at high erbium concentrations, assure the re-circulation of the excitation on the metastable levels of Er3+, leading to supraunitary quantum efficiency and high emission efficiency in CW regime. In contrast with the CW (and free-generation) regime, the energy transfer processes are frozen during the generation of the giant pulse in Q-switch regime, limiting severely the access to the stored energy. As a consequence, the efficiency in Q-switch is low. We find simple analytic expressions for the emission efficiency in CW, free-generation and Q-switch regimes. We compare the results of the modeling with the available experimental results. Finally, some suggestions to improve the overall efficiency of the 3-μm erbium lasers working in Q-switch regime are given.

Paper Details

Date Published: 21 October 2004
PDF: 16 pages
Proc. SPIE 5581, ROMOPTO 2003: Seventh Conference on Optics, (21 October 2004); doi: 10.1117/12.582801
Show Author Affiliations
Serban Georgescu, National Institute for Laser, Plasma, and Radiation Physics (Romania)
Ovidiu Toma, National Institute for Laser, Plasma, and Radiation Physics (Romania)
Horatiu Totia, National Institute for Laser, Plasma, and Radiation Physics (Romania)


Published in SPIE Proceedings Vol. 5581:
ROMOPTO 2003: Seventh Conference on Optics
Valentin I. Vlad, Editor(s)

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