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Proceedings Paper

Phase-coupled CO2 laser array performance and lossless beam shaping
Author(s): Gilbert L. Bourdet; Guillaume Lescroart
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Paper Abstract

Phase coupling of medium power high beam quality lasers are of great interest for achieving high power diffraction limited beam with high gain lasers. This make it possible to set up compact and efficient sources. In this paper, we review the work performed in our laboratory concerning the coherent array of CO2 waveguide lasers. We report the various techniques used for phase coupling like Talbot effect, intra-cavity spatial filtering and anti-guiding effect and we give the relevant performances in terms of beam quality and efficiency. After, we discuss the advantages and drawbacks brought by each one. The far field diffraction pattern supplied by a series of coherent independent lasers is made of several asymmetric lobes. We then present lossless techniques making it possible to convert this multilobe asymmetric far field diffraction patterns into a single lobe symmetric beam. Last, we discuss the capability of slab CO2 laser with a graded-phase mirror cavity for generating large stable mode and, then, improving the energy extraction efficiency.

Paper Details

Date Published: 7 August 1998
PDF: 11 pages
Proc. SPIE 3549, High-Power Lasers: Solid State, Gas, Excimer, and Other Advanced Lasers II, (7 August 1998); doi: 10.1117/12.344136
Show Author Affiliations
Gilbert L. Bourdet, Ecole Polytechnique/ENSTA (France)
Guillaume Lescroart, Ecole Polytechnique/ENSTA (France)

Published in SPIE Proceedings Vol. 3549:
High-Power Lasers: Solid State, Gas, Excimer, and Other Advanced Lasers II
Sui-Sheng Mei; Keith A. Truesdell, Editor(s)

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