Modeling of Absorption Induced by Space Radiation on Glass: A Two-Variable Function Depending on Radiation Dose and Post-Irradiation Time

NBK7 and FK51 glass from SCHOTT commonly employed on space optical instrumentation design have been gamma irradiated in order to relate the color centers generated by effect of the radiation to the changes in their optical properties. The effects of gamma radiation on the glass optical properties have been analyzed from transmission measurements and ellipsometric characterization. The absorption bands induced on glass by gamma-radiation were included in the optical model by Gaussian absorption peaks. The variations obtained of the real part of the refractive index and surface roughness were negligible. An exponential function is proposed to describe the absorption increase when the total dose rises. Additionally, a study of the amplitude decrease of these absorption bands with the time is carried out in order to determine relaxation functions. Finally, a two variable function-absorption peak amplitude versus total dose and relaxation time-is proposed in order to link the exponential growth of the absorption peak amplitude with the relaxation function of the absorption bands. The model proposed provides a description of the possible changes produced in the glass optical properties by effect of gamma radiation and predicts the glass behavior with the time

[1]  Corey L. Bungay,et al.  Overview of variable-angle spectroscopic ellipsometry (VASE): I. Basic theory and typical applications , 1999, Optics + Photonics.

[2]  Andrei I. Gusarov,et al.  Modeling of gamma-radiation impact on transmission characteristics of optical glasses , 2002, SPIE Remote Sensing.

[3]  P. Baumeister,et al.  The Radiant Transmittance of Tandem Arrays of Filters , 1972 .

[4]  A. Bishay,et al.  Radiation induced color centers in multicomponent glasses , 1970 .

[5]  Reinhard H. Czichy.  Optical design and technologies for space instrumentation , 1994, Other Conferences.

[6]  Michel Fruit,et al.  Measuring space radiation impact on the characteristics of optical glasses: measurement results and recommendations from testing a selected set of materials , 2002, SPIE Optics + Photonics.

[7]  Michel Fruit,et al.  Prediction of long-term radiation kinetics of transmission spectra of commerical optical glasses , 2002, SPIE Optics + Photonics.

[8]  Michel Fruit,et al.  Space radiation sensitivity of glasses: first results toward a comprehensive dose coefficients database , 2000, SPIE Optics + Photonics.

[9]  D. Aspnes.  Optical properties of thin films , 1982 .

[10]  C. R. A. Catlow,et al.  Point Defects in Materials , 1988 .

[11]  Dominic B. Doyle,et al.  Influences of simulated space radiation on optical glasses , 1994, Other Conferences.

[12]  Zhang,et al.  Fundamental role of creation and activation in radiation-induced defect production in high-purity amorphous SiO2. , 1996, Physical review letters.

[13]  Michel Fruit,et al.  Radiation impact on spaceborne optics: the dose coefficients approach , 1999, Remote Sensing.

[14]  David L. Griscom,et al.  Fractal kinetics of radiation-induced point-defect formation and decay in amorphous insulators: Application to color centers in silica-based optical fibers , 2001 .

[15]  Paul W. Levy,et al.  The Kinetics of Gamma‐Ray Induced Coloring of Glass , 1960 .

[16]  S. Pellicori,et al.  Radiation induced transmission loss in optical materials. , 1979, Applied optics.

[17]  R. Azzam,et al.  Ellipsometry and polarized light , 1977 .

[18]  Harland G. Tompkins,et al.  A User's Guide to Ellipsometry , 1992 .

[19]  Monika J. Liepmann,et al.  Gamma radiation effects on some optical glasses , 1993, Optics & Photonics.

[20]  John A. Woollam,et al.  Overview of variable-angle spectroscopic ellipsometry (VASE): II. Advanced applications , 1999, Optics + Photonics.

[21]  Andrew Holmes-Siedle,et al.  Handbook of Radiation Effects , 1993 .

[22]  Gingerich,et al.  Radiation-induced defects in glasses: Origin of power-law dependence of concentration on dose. , 1993, Physical review letters.