Efficiency of magnetorheological fluid finishing on the elimination of defects in fused silica optics

R. Catrin; D. Taroux; P. Cormont; C. Maunier; T. Corbineau; G. Razé; J. Néauport

doi:10.1117/12.2029388

15 October 2013 Efficiency of magnetorheological fluid finishing on the elimination of defects in fused silica optics

R. Catrin, D. Taroux, P. Cormont, C. Maunier, T. Corbineau, G. Razé, J. Néauport

Proceedings Volume 8884, Optifab 2013; 88840A (2013) https://doi.org/10.1117/12.2029388
Event: SPIE Optifab, 2013, Rochester, New York, United States

Abstract

The MegaJoule laser being constructed at the CEA near Bordeaux (France) is designed to focus more than 1 MJ of energy of UV light, on a millimeter scale target in the centre of an experiment chamber. After amplification and transport at the wavelength of 1053 nm, frequency conversion at 351 nm is done with KH₂PO₄ crystals. The final optic assembly of this system is made up of large fused silica optics, working in transmission, that are used to convey, focus or shape the laser beam. When exposed to fluences of some joules per square centimeter at 351 nm within nanosecond pulse duration, fused silica optics can exhibit localized damage. Damage sites grow exponentially after further laser exposition and therefore dramatically limit the optic lifetime. The nature of the surface finishing process has been established to determine the lifetime of these components under high UV fluences (i.e. more than 5 J/cm² for 3 ns pulses). Being able to reduce or eliminate the damage initiators such as subsurface cracks present in subsurface damage (SSD) layer of conventionally polished optical components aims this study. Magneto-rheological fluid finishing (MRF) is chosen as a final polishing tool to remove layers of material without inducing further damages. MRF enables to process optics with very small normal stresses applied to the surface during material removal and thus permits the elimination of the residual subsurface cracks. This study offers a better understanding of the efficiency of MRF polishing on the elimination of subsurface cracks in SSD layers.

Citation Download Citation

R. Catrin, D. Taroux, P. Cormont, C. Maunier, T. Corbineau, G. Razé, and J. Néauport "Efficiency of magnetorheological fluid finishing on the elimination of defects in fused silica optics", Proc. SPIE 8884, Optifab 2013, 88840A (15 October 2013); https://doi.org/10.1117/12.2029388

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