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

Nicolas Sanner; Nicolas Huot; Eric Audouard; Christian Larat; Jean-Pierre Huignard

doi:10.1117/12.590353

12 April 2005 Spatial beam shaping of femtosecond pulses with an optically addressed light valve

Nicolas Sanner, Nicolas Huot, Eric Audouard, Christian Larat, Jean-Pierre Huignard

Proceedings Volume 5708, Laser Resonators and Beam Control VIII; (2005) https://doi.org/10.1117/12.590353
Event: Lasers and Applications in Science and Engineering, 2005, San Jose, California, United States

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.

Citation Download Citation

Nicolas Sanner, Nicolas Huot, Eric Audouard, Christian Larat, and Jean-Pierre Huignard "Spatial beam shaping of femtosecond pulses with an optically addressed light valve", Proc. SPIE 5708, Laser Resonators and Beam Control VIII, (12 April 2005); https://doi.org/10.1117/12.590353

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