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Proceedings Paper

Spatial beam shaping of femtosecond pulses with an optically addressed light valve
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Paper Abstract

We propose a versatile set-up dedicated to programmable beam shaping of femtosecond pulses in a focal plane. A non-pixelated liquid-crystal light valve is used as the phase-front modulator. We demonstrate active and adaptive wavefront correction of a 4-μJ, 100-kHz amplified laser chain, where residual wavefront distorsions are decreased down to λ/15 peak-valley and λ/100 rms. The subsequent improvement for micromachining applications is investigated, and diffraction-limited holes are demonstrated on various materials. Moreover, beam patterning in the focal plane is also presented. Theoretical calculations of the required phase modulation are proposed, and experimental shapes are demonstrated, like square and circular top-hats, as well as triangle or doughnut shapes.

Paper Details

Date Published: 12 April 2005
PDF: 8 pages
Proc. SPIE 5708, Laser Resonators and Beam Control VIII, (12 April 2005); doi: 10.1117/12.590353
Show Author Affiliations
Nicolas Sanner, Lab. Traitement du Signal et Instrumentation, CNRS, and Univ. Jean Monnet Saint-Etienne (France)
Nicolas Huot, Lab. Traitement du Signal et Instrumentation, CNRS, and Univ. Jean Monnet Saint-Etienne (France)
Eric Audouard, Lab. Traitement du Signal et Instrumentation, CNRS, and Univ. Jean Monnet Saint-Etienne (France)
Christian Larat, Thales Research and Technology (France)
Jean-Pierre Huignard, Thales Research and Technology (France)


Published in SPIE Proceedings Vol. 5708:
Laser Resonators and Beam Control VIII
Alexis V. Kudryashov; Alan H. Paxton, Editor(s)

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