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Proceedings Paper

Large aspherical focusing and beam-deviating square lens: manufacturing and tests results
Author(s): Roland Geyl; Francois Lepretre; Andre Roussel; Genevieve Chabassier
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Paper Abstract

Large aspherical focusing and beam deviating square lenses will be used in the framework of the Laser Megajoules project developed by the French Atomic Energy Commission. In order to validate the associated manufacturing processes a half scale prototype lens has been manufactured and tested by REOSC (SFIM subsidiary). Specific aspherical generating process and computer controlled micro-polishing technology have been used in order to demonstrate the faisability of a mass production on an industrial basis (approximately 1300 lenses in 6 years). A 250 mm square lens in Fused Silica with a convex hyperboloid profile (250 microns difference with respect to the best sphere) has been manufactured and REOSC reached a transmitted wavefront better than 130 nm Peak-peak, 11 nm rms. Moreover residual micro-oscillations amplitudes (spatial frequency 0.5 to 30 mm) have been limited to 60 nm PTV and 8 nm rms. The total work duration for this exploratory lens remained below 60 hours.

Paper Details

Date Published: 8 December 1997
PDF: 8 pages
Proc. SPIE 3047, Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference, (8 December 1997); doi: 10.1117/12.294279
Show Author Affiliations
Roland Geyl, REOSC (France)
Francois Lepretre, REOSC (France)
Andre Roussel, Ctr. d'Etudes de Limeil-Valenton/CEA (France)
Genevieve Chabassier, Ctr. d'Etudes de Limeil-Valenton/CEA (France)

Published in SPIE Proceedings Vol. 3047:
Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference
Michel L. Andre, Editor(s)

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