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Opt Lett. 2005 Jun 15;30(12):1479-81.

Programmable focal spot shaping of amplified femtosecond laser pulses.

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  • 1Laboratoire Traitement du Signal et Instrumentation, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5516, 10 Rue Barrouin, Bât. F, 42000 Saint-Etienne, France.


We describe the programmable spatial beam shaping of 100-kHz, 4-microJ amplified femtosecond pulses in a focal plane by wave-front modulation. Phase distributions are determined by a numerical iterative procedure. A nonpixelated optically addressed liquid-crystal light valve is used as a programmable wave-front tailoring device. Top-hat, doughnut, square, and triangle shapes of 20-microm size are obtained in a focal plane. Their suitability for femtosecond laser machining is demonstrated.

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