Programmable spatial beam shaping of a 100 kHz amplified femtosecond laser

Nicolas Sanner (1) , Nicolas Huot (1) , Eric Audouard (1) , Christian Larat (2) , Brigitte Loiseaux (2) , Jean-Pierre Huignard (2)

1 LHC - Laboratoire Hubert Curien
2 Thales Research and Technology [Palaiseau]

We present programmable spatial beam-shaping of 100-kHz, 4-µJ amplified femtosecond pulses in a focal plane using wavefront modulation. Phase distributions are determined by a numerical iterative procedure. A non-pixelated optically-addressed liquid crystal light valve is used as a programmable wavefront tayloring device. Top-hat, doughnut, square and triangle shapes with a 20-Μm size are obtained in a focal plane. The suitability for femtosecond laser machining is demonstrated.

Domaines: Optique [physics.optics]

Nicolas Sanner, Nicolas Huot, Eric Audouard, Christian Larat, Brigitte Loiseaux, et al.. Programmable spatial beam shaping of a 100 kHz amplified femtosecond laser. Optics Letters, 2005, 30, pp.1479-1481. ⟨ujm-00118057⟩