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- Title
Spatial quality improvement of a Ti:Sapphire laser beam by modal filtering.
- Authors
Mahieu, Benoît; Gauthier, David; Perdrix, Michel; Ge, Xunyou; Boutu, Willem; Lepetit, Fabien; Wang, Fan; Carré, Bertrand; Auguste, Thierry; Merdji, Hamed; Garzella, David; Gobert, Olivier
- Abstract
We present a study on the improvement of the spatial quality of a laser beam, called modal filtering, suitable to high-energy lasers. The method is theoretically compared with the classical pinhole filtering technique in the case of an astigmatic Gaussian beam, illustrating, in this particular case, its efficiency for filtering low spatial frequencies. Experimental study of the modal filtering of a temporally chirped beam from a Ti:Sapphire chirped-pulse-amplification system is presented. Beam profile, wavefront and pulse duration after compression were measured, showing a dramatic improvement of beam quality and no modifications of the temporal distribution. High-order harmonic generation in a rare gas, a highly nonlinear process which is phase-matching dependent, was used to test the effect of the filter and showed a clear enhancement of the generation.
- Subjects
TITANIUM; SAPPHIRES; LASER beams; MODAL filtering; PINHOLE photography; COMPARATIVE studies; COMPRESSION loads
- Publication
Applied Physics B: Lasers & Optics, 2015, Vol 118, Issue 1, p47
- ISSN
0946-2171
- Publication type
Article
- DOI
10.1007/s00340-014-5953-4