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Single-mode cw Cr(3+):LiSrAlF(6) laser using an external fiber grating.

N J Vasa, T Okada, M Maeda

    Optics Letters
    |November 3, 2009
    PubMed
    Summary

    Researchers achieved efficient single-mode operation in a chromium-doped lithium strontium aluminum fluoride (Cr(3+):LiSAF) laser. This was accomplished by self-injection locking the laser oscillator with a specialized fiber grating, optimizing laser performance.

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    Area of Science:

    • Laser Physics
    • Materials Science

    Background:

    • Cr(3+):LiSAF lasers are valuable for tunable laser applications.
    • Achieving stable single-mode operation in such lasers can be challenging.
    • External cavity configurations are often used to control laser output.

    Purpose of the Study:

    • To develop a Cr(3+):LiSAF laser oscillator with stable single-mode operation.
    • To investigate the effectiveness of fiber gratings for laser self-injection locking.
    • To optimize laser performance through controlled feedback.

    Main Methods:

    • Constructed a Cr(3+):LiSAF laser oscillator.
    • Utilized an externally coupled fiber grating for self-injection locking.
    • Fabricated the fiber grating using holographic techniques with KrF UV laser exposure.

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  • Employed a 67% reflectivity fiber grating for single-mode selection.

    • Main Results:

    • Successfully achieved stable single-mode operation in the Cr(3+):LiSAF laser.
    • Demonstrated the efficacy of fiber grating self-injection locking for mode control.
    • The holographic fabrication technique allowed for precise grating reflectivity.

    Conclusions:

    • Self-injection locking with a fiber grating is an effective method for achieving single-mode operation in Cr(3+):LiSAF lasers.
    • The use of a fiber grating with optimized reflectivity is crucial for efficient single-mode performance.
    • This technique offers a practical approach for developing high-performance tunable lasers.