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1.5-mum emissions from laser-diode-pumped Nd-doped microchip solid-state lasers.

S L Hwong, J L Chern, K Otsuka

    Optics Letters
    |December 8, 2007
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    Researchers observed 1.5-micrometer emissions from microchip lasers using Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG) and other materials. These emissions result from modified lattice vibrations and stimulated Raman scattering within the laser configuration.

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    Area of Science:

    • Laser Physics
    • Materials Science

    Background:

    • Neodymium-doped lasers are crucial for various optical applications.
    • Microchip laser configurations offer compact and efficient laser sources.
    • Understanding emission mechanisms is key to optimizing laser performance.

    Purpose of the Study:

    • To investigate and characterize 1.5-micrometer emissions from specific Neodymium-doped microchip lasers.
    • To identify the underlying physical mechanisms responsible for these emissions.
    • To explore the potential of these lasers for generating new wavelengths.

    Main Methods:

    • Utilized Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG), Neodymium-doped Yttrium Orthovanadate (Nd:YVO4), and Lithium Neodymium Tetraphosphate (LiNdP4O12) microchip lasers.
    • Pumped the microchip lasers using laser diodes.
    • Analyzed the observed 1.5-micrometer emissions using spectroscopic techniques.
    • Identified the generation mechanism through analysis of lasing fields and Stokes components.

    Main Results:

    • Successfully observed coherent 1.5-micrometer emissions from Nd:YAG, Nd:YVO4, and LiNdP4O12 microchip lasers.
    • Attributed the emissions to high-energy modified lattice vibrations due to Neodymium ions.
    • Identified stimulated intracavity Raman scattering, enhanced by the microchip design, as a contributing factor.
    • Determined that a four-wave mixing process involving lasing and Stokes fields generates new adjacent 1.5-micrometer emissions.

    Conclusions:

    • Neodymium-doped microchip lasers can produce significant 1.5-micrometer emissions.
    • Modified lattice vibrations and stimulated Raman scattering are key mechanisms.
    • Four-wave mixing plays a role in generating adjacent emission lines, broadening spectral possibilities.