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- Title
22 W average power multiterawatt femtosecond laser chain enabling 10<sup>19</sup> W/cm<sup>2</sup> at 100 Hz.
- Authors
Clady, R.; Azamoum, Y.; Charmasson, L.; Ferré, A.; Utéza, O.; Sentis, M.
- Abstract
We measure the wavefront distortions of a high peak power ultrashort (23 fs) laser system under high average power load. After 6 min—100 Hz operation of the laser at full average power (> 22 W after compression), the thermally induced wavefront distortions reach a steady state and the far-field profile of the laser beam no longer changes. By means of a deformable mirror located after the vacuum compressor, we apply a static pre-compensation to correct those aberrations allowing us to demonstrate a dramatic improvement of the far-field profile at 100 Hz with the reduction of the residual wavefront distortions below λ/16 before focusing. The applied technique provides 100 Hz operation of the femtosecond laser chain with stable pulse characteristics, corresponding to peak intensity above 1019 W/cm2 and average power of 19 W on target, which enables the study of relativistic optics at high repetition rate using a moderate f-number focusing optics (f/4.5).
- Subjects
WAVEFRONTS (Optics); WAVEFRONT sensors; LASER beams; ULTRASHORT laser pulses; FRAUNHOFER region (Electromagnetism)
- Publication
Applied Physics B: Lasers & Optics, 2018, Vol 124, Issue 5, p1
- ISSN
0946-2171
- Publication type
Article
- DOI
10.1007/s00340-018-6958-1