Programmable focal spot shaping of amplified femtosecond laser pulses

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 programmabl...

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Veröffentlicht in:	Optics letters 2005-06, Vol.30 (12), p.1479-1481
Hauptverfasser:	SANNER, Nicolas, HUOT, Nicolas, AUDOUARD, Eric, LARAT, Christian, HUIGNARD, Jean-Pierre, LOISEAUX, Brigitte
Format:	Artikel
Sprache:	eng
Schlagworte:	Beam characteristics: profile, intensity, and power spatial pattern formation Exact sciences and technology Fundamental areas of phenomenology (including applications) Laser optical systems: design and operation Optics Physics
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Beschreibung
Zusammenfassung:	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.
ISSN:	0146-9592 1539-4794
DOI:	10.1364/ol.30.001479