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Radiation-induced changes in refractive index and absorption coefficient for several optical materials.

D R Olson, H D Dieselman, J B Schroeder

    Applied Optics
    |January 23, 2010
    PubMed
    Summary

    X-radiation alters optical properties of materials. Calcium fluoride and various optical glasses showed measurable changes in refractive index and absorption coefficient after a 10(5) rad dose, indicating radiation-induced effects.

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    Area of Science:

    • Materials Science
    • Optical Physics
    • Radiation Effects

    Background:

    • Optical materials are crucial for various applications.
    • Understanding their response to radiation is essential for performance and longevity.
    • X-radiation can induce changes in material properties, affecting their optical performance.

    Purpose of the Study:

    • To quantify the changes in refractive index and absorptivity of optical materials after X-ray exposure.
    • To assess the radiation sensitivity of different optical glasses and calcium fluoride.
    • To establish baseline data for radiation-induced optical property changes.

    Main Methods:

    • Samples of calcium fluoride, several optical glasses (LaK 8, PSK 53, FK 50, SF 8, KzFS 5), and a silica control (SiO(2) Suprasil 2B) were irradiated.
    • A radiation dose of 10(5) rad was applied.
    • Changes in refractive index and absorption coefficient were measured at specific wavelengths (lambda = 0.5330 microm and lambda = 0.5000 microm, respectively).

    Main Results:

    • Calcium fluoride exhibited changes of ~5.8 x 10(-6) in refractive index and ~0.1 cm(-1) in absorption coefficient.
    • Optical glasses showed varying degrees of change: LaK 8 (~5.8 x 10(-6), ~1.1 cm(-1)), PSK 53 (~4.3 x 10(-6), ~1.7 cm(-1)), FK 50 (~5.1 x 10(-6), ~1.4 cm(-1)), and SF 8 (~6.0 x 10(-6), ~1.0 cm(-1)).
    • KzFS 5 showed an absorption coefficient change of ~0.52 cm(-1), while the SiO(2) control sample showed minimal changes below measurement capability.

    Conclusions:

    • X-radiation induces measurable changes in the refractive index and absorption coefficient of optical materials, including calcium fluoride and various optical glasses.
    • The extent of these changes varies depending on the specific material composition.
    • These findings are critical for selecting radiation-hardened optical materials for applications involving X-ray exposure.