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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Solid State Physics

    Background:

    • Transparent materials are crucial in optical systems.
    • Understanding their optical properties under thermal stress is essential for device reliability and performance.
    • Optical anisotropy in nominally isotropic materials can arise from various physical phenomena.

    Purpose of the Study:

    • To experimentally and theoretically investigate the induction of optical anisotropy in transparent materials subjected to continuous-wave (CW) laser heating.
    • To elucidate the underlying physical mechanisms, specifically uniaxial thermally induced strain and the elasto-optic effect.
    • To assess the applicability of this phenomenon for analyzing the absorptive properties of transparent optical materials.

    Main Methods:

    • Experimental: Heating optically isotropic materials (glasses, lithium niobate crystals) with CW pump beams and probing the induced optical anisotropy.
    • Theoretical: Developing a model to explain the observed anisotropy based on thermo-elastic and elasto-optic principles.
    • Material Characterization: Analyzing the relationship between heating, induced strain, and optical anisotropy.

    Main Results:

    • Demonstrated that CW pump beam heating induces significant optical anisotropy in primarily isotropic transparent materials.
    • Confirmed the role of uniaxial thermally induced strain coupled with the elasto-optic effect as the primary mechanism.
    • Observed and quantified the anisotropy in both amorphous (glasses) and crystalline (lithium niobate) materials.
    • Established a correlation between material absorption and the magnitude of the induced anisotropy.

    Conclusions:

    • Heating transparent materials with CW beams is a viable method to induce measurable optical anisotropy.
    • The elasto-optic effect acting on thermally induced strain is the key physical mechanism.
    • This discovered effect offers a novel pathway for characterizing the absorptive properties of transparent optical materials, crucial for advanced optical technologies.