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Optical a nd ,·olllmC'tric relaxation s in glass we re st udied after compress ing specimens .f hours at \),000 atmospheres and 210 C. Following re l ea~e of pressure t he refractiv e index waR higher than the o rigin a l val ue a nd decreased with time, recovering its ini tia l valu e wiLhin 12 hour~. Optical-relaxation cun·es for lead and borosilicate glasses ,\·e re complcx, the dcLailed behavior depend in g on composition and thermal histo ry. No corresponding effects we rp obsel"\·ed in fURed silica after expo~ure to even higher pressures. Volumetric cllanges associated wit h index changes were dC'lermi ned interfcrometricall.v and fOll nd to be less than correspo ndin g changp, known to [lccompall!· annpaling. Pos~ible implicat ions of the results are d iscllssc'd.

Optical and volumetric relaxation effects in glass following removal of high hydrostatic pressures