Large aspherical focusing and beam-deviating square lens: manufacturing and tests results

Roland Geyl; Francois Lepretre; Andre Roussel; Genevieve Chabassier

doi:10.1117/12.294279

8 December 1997 Large aspherical focusing and beam-deviating square lens: manufacturing and tests results

Roland Geyl, Francois Lepretre, Andre Roussel, Genevieve Chabassier

Proceedings Volume 3047, Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference; (1997) https://doi.org/10.1117/12.294279
Event: Second International Conference on Solid State Lasers for Application to ICF, 1996, Paris, France

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.

Citation Download Citation

Roland Geyl, Francois Lepretre, Andre Roussel, and Genevieve Chabassier "Large aspherical focusing and beam-deviating square lens: manufacturing and tests results", Proc. SPIE 3047, Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference, (8 December 1997); https://doi.org/10.1117/12.294279

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