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    Area of Science:

    • Materials Science
    • Laser Physics
    • Solid-State Spectroscopy

    Background:

    • Chromium-doped magnesium silicate (Mg(2)SiO(4):Cr) is a crystalline material with potential applications in laser technology.
    • Understanding its optical properties, particularly near-infrared absorption, is crucial for developing new laser devices.
    • Saturable absorbers are key components for passive Q-switching and mode-locking in lasers.

    Purpose of the Study:

    • To investigate the near-infrared absorption characteristics of Mg(2)SiO(4):Cr.
    • To determine the absorption cross-section of Mg(2)SiO(4):Cr at 1.08 micrometers.
    • To evaluate the performance of Mg(2)SiO(4):Cr as a saturable absorber for laser applications.

    Main Methods:

    • Optical absorption spectroscopy was used to study Mg(2)SiO(4):Cr in the near-infrared region.
    • The absorption cross-section was calculated from the observed saturation behavior.
    • The material was employed as a saturable absorber in a Nd:YAG laser cavity to demonstrate Q-switching and passive mode-locking.

    Main Results:

    • Saturation of near-infrared absorption in Mg(2)SiO(4):Cr was successfully observed.
    • The absorption cross-section at 1.08 micrometers was estimated to be sigma(alpha) = (2.3 +/- 0.3) x 10(-18) cm(2).
    • Both Q-switching and passive mode-locking of a Nd:YAG laser were achieved using Mg(2)SiO(4):Cr as the saturable absorber.

    Conclusions:

    • Mg(2)SiO(4):Cr exhibits significant saturable absorption in the near-infrared, making it a promising material for laser applications.
    • The quantified absorption cross-section provides essential data for laser design and modeling.
    • The successful demonstration of Q-switching and mode-locking validates the efficacy of Mg(2)SiO(4):Cr as a passive laser modulator.