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Proceedings Paper

Polishing and coating of a F1250mm 90° off-axis parabola for PW lasers
Author(s): A. Hervy; A. Dussourd; G. Chaussat; D. Mouricaud; G. Chériaux; L. Gallais; R. Geyl
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Paper Abstract

The peak power handling capability of ultra-short pulse lasers is main concern for new facilities, like those for the French Apollon 10P, and European Extreme Light Infrastructure (ELI) projects. Indeed, these last generation lasers require complex, large (Ø1m) and resistant optical components with optimized thin-film coatings. Using on one hand the recent development of high laser resistant broadband high reflective coatings through a joint project with the Laboratoire d’Optique Appliquée and Fresnel Institute, and on the other hand its long time experience with polishing and measuring large and complex optical components, Reosc decided to demonstrate the feasibility of a Ø500mm aperture, 90° deviation, F/2.5 high output NA Off-Axis Parabola (OAP) dedicated to focus fs ultra-intense laser beams. The prototype of the 90° OAP has a concave surface with 20mm of aspherisation for focal length of F1250mm. The OAP is coated with a hybrid Metal/Multi-Layer-Dielectric coating. It provides a reflectivity up to 98%, an absolute Group Delay Dispersion (GDD) below 100fs² and a Laser-Induced Damage Threshold (LIDT) up to 0.5J/cm², at 15fs and under vacuum. These performances are achieved on the whole surface and on the 200nm spectral range required by the sub 20fs PW-systems. In this paper, Reosc report the developments required for the polishing, the coating and the measurements of the OAP and we will show the performances achieved on the prototype.

Paper Details

Date Published: 23 September 2015
PDF: 6 pages
Proc. SPIE 9627, Optical Systems Design 2015: Advances in Optical Thin Films V, 962719 (23 September 2015); doi: 10.1117/12.2191061
Show Author Affiliations
A. Hervy, REOSC (France)
A. Dussourd, REOSC (France)
G. Chaussat, REOSC (France)
D. Mouricaud, REOSC (France)
G. Chériaux, Lab. pour l'Utilisation des Lasers Intenses (France)
L. Gallais, Institut Fresnel, CNRS, Aix Marseille Univ. (France)
R. Geyl, REOSC (France)

Published in SPIE Proceedings Vol. 9627:
Optical Systems Design 2015: Advances in Optical Thin Films V
Michel Lequime; H. Angus Macleod; Detlev Ristau, Editor(s)

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