Abstract
We measured the thermal shock fracture and strength degradation of the commercially available BK-7 borosilicate crown optical glass as a function of surface finish prior to thermal shock testing and amount of temperature drop in de-ionized water and a more viscous silicone oil. There is little strength degradation for temperature drops smaller than critical. Post-quenching strength depends on surface finish and the cooling/rinsing medium.
© 2010 OSA, SPIE
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