Low-cost mirror substrates: manufacturing process evolution

Francois Rosala; Michele Meyer; Jean-Sebastien Bes de Berc; Andre Roussel; Emmanuel Beriot

doi:10.1117/12.294273

8 December 1997 Low-cost mirror substrates: manufacturing process evolution

Francois Rosala, Michele Meyer, Jean-Sebastien Bes de Berc, Andre Roussel, Emmanuel Beriot

Proceedings Volume 3047, Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference; (1997) https://doi.org/10.1117/12.294273
Event: Second International Conference on Solid State Lasers for Application to ICF, 1996, Paris, France

Abstract

In the framework of the Megajoule Laser project driven by the French Atomic Energy Board, one of the most valuable optical programs in term of material volume as well as in term of component size, the actual glasses and production means appear to be inconsistent with the economical objectives. Corning proposed an alternative, based on the use of a low cost glass, together with an evolution of the production process. Combining its experience in quality optical glasses manufacturing and its mastery of forming processes, Corning conducted a production cost reduction program; the objective of this program was to validate the concept of large slab melting (about 2000 kg each), where blocks are cut off, versus the conventional single block (about 100 kg) melting. Economical improvements are based on a reduction of lost time (mold change) and production lead- time by increasing the feeding yield, on a better glass utilization, and a reduced number of molds. The technical issues were: increase the feeding yield maintaining a given glass quality level, reduce the glass allowance, improve the materials of the molds, reinforce the thermal process control, automatism of critical operations, especially at the start-up and at the end of the mold feeding. Despite the long production cycle, about 3 months including melting and annealing, the first results carry the technological options set-up.

Citation Download Citation

Francois Rosala, Michele Meyer, Jean-Sebastien Bes de Berc, Andre Roussel, and Emmanuel Beriot "Low-cost mirror substrates: manufacturing process evolution", Proc. SPIE 3047, Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference, (8 December 1997); https://doi.org/10.1117/12.294273

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KEYWORDS

Glasses

Optics manufacturing

Mirrors

Manufacturing

Yield improvement

Annealing

Control systems

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