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Intracavity phase element improves laser mode stability
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Paper Abstract

We demonstrate an approach for stabilizing the transverse mode structure in cases where there is strong coupling between the longitudinal and the transverse modes. In this approach, an intracavity phase element that discriminates and selects a specific transverse mode is inserted into the laser resonator. We show that the discrimination can be so strong that the selection of the single transverse mode remains stable despite changes of the resonator length. We calculated the ratio of the small-signal gain and the gain threshold value for the fundamental and (1,0) Hermite-Gaussian modes, as function of a tiny change &Dgr;z of the resonator length, with and without the phase element. Without the phase element, the tiny change of the axial coordinate z of one of the mirrors of CO2 laser leads to periodical change of different transverse modes. Introducing intracavity phase element preserves a single transverse mode, which is kept practically unchanged with the change of the axial coordinate z, except for a slight periodical change of the output power and the beam quality, due to the periodicity of the resonance conditions.

Paper Details

Date Published: 26 April 2007
PDF: 8 pages
Proc. SPIE 6346, XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 63462Z (26 April 2007); doi: 10.1117/12.739316
Show Author Affiliations
G. Machavariani, Soreq Nuclear Research Ctr. (Israel)
N. Davidson, Weizmann Institute of Science (Israel)
A. A. Ishaaya, Weizmann Institute of Science (Israel)
A. A. Friesem, Weizmann Institute of Science (Israel)

Published in SPIE Proceedings Vol. 6346:
XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers
Dieter Schuöcker, Editor(s)

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