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Proceedings Paper

Time-varying M2 in Q-switched lasers
Author(s): Andrea L. Caprara; Giancarlo C. Reali
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Paper Abstract

Numerical simulations of the pulse build-up in a Q-switched laser reveal a considerable change in the beam spatial profile during the pulse evolution, on a nanosecond time scale. Such changes were measured experimentally, and the measured temporal evolution of the beam profile is shown to be in good agreement with the theoretical results. The time evolution of the spatial profile translates into an evolution of the beam quality parameter M2; for typical experimental conditions, in a Nd:YAG laser utilizing a variable reflectivity mirror resonator1, M2 is very close to a value of 1 at the beginning of the pulse, and increases smoothly throughout the pulse to reach a value of approximately 2 in correspondence of the pulse trailing edge.

Paper Details

Date Published: 1 June 1992
PDF: 10 pages
Proc. SPIE 1625, Design, Modeling, and Control of Laser Beam Optics, (1 June 1992); doi: 10.1117/12.58958
Show Author Affiliations
Andrea L. Caprara, Continuum International, Inc. (United States)
Giancarlo C. Reali, Univ. di Pavia (Italy)

Published in SPIE Proceedings Vol. 1625:
Design, Modeling, and Control of Laser Beam Optics
Youssef Kohanzadeh; George N. Lawrence; John G. McCoy; Hugo Weichel, Editor(s)

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