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Optical properties and structure of porous glasses

Evstrapov A. A., Antropova T. V., Drozdova I. A., Yastrebov S. G.

Optica Applicata

2003

Vol. 33, nr 1

45-54

The results of measurements concerning spectral dependences of transmission and reflection coefficients both for porous and two-phase glasses are presented. Relative estimations have been performed for transmission and reflection coefficients of examined samples. Optical characteristics, such as the dispersion of refractive index and absorption coefficient, have been found for porous glasses. Porosity of the material and the sizes of micropores have been determined from the optical characteristics of glasses with the assumption of identity and uniformity of pores.

Porous glass: inhomogeneities and light transmission.

Antropova T.V., Drozdova I.A., Yastrebov S.G., Evstrapov A.A.

Optica Applicata

2000

Vol. 30, nr 4

553-568

Basic optical characteristics were studied to reveal the structure of porous glass samples. Acid leaching technology was used to manufacture porous glasses from the bulk of phase-separated alkali borosilicate glasses. The transmission electron microscopy, selected area diffraction and shadow graph techniques, optical microscopy and spectrophotometry, reflective ellipsometry were used to obtain new information about some inhomogeneities such as strata and spindle-like silica precipitates as well as boron containing microcrystalline phases inside porous glasses.