Vs. Doladugina et Ya. Shvechenkov, EFFECT OF HYDROGEN ON THE OPTICAL HOMOGENEITY OF KU-1 QUARTZ GLASS, Journal of optical technology, 61(2), 1994, pp. 154-158
Variability of the optical homogeneity in not only magnitude but also
form is measured along the axis of a brock of quartz glass. It is show
n that remelting KU-1 quartz glass in a hydrogen atmosphere improves i
ts optical homogeneity. The optical inhomogeneity of the quartz glass
before remelting was caused by an excess concentration of free oxygen.