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Continuous-wave 1.50-microm thulium cascade laser.

R C Stoneman, L Esterowitz

    Optics Letters
    |September 24, 2009
    PubMed
    Summary
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    Continuous-wave laser emission at 1.50 micrometers was achieved using a cascade laser scheme. This novel approach utilizes thulium (Tm3+) and holmium (Ho3+) ions in YLiF4 for efficient room-temperature operation.

    Area of Science:

    • Laser Physics
    • Materials Science
    • Quantum Electronics

    Background:

    • Thulium (Tm3+) and holmium (Ho3+) doped materials are crucial for infrared laser applications.
    • Self-terminating transitions often limit laser efficiency and continuous-wave operation.
    • Developing efficient room-temperature lasers is a key goal in photonics.

    Purpose of the Study:

    • To achieve continuous-wave (CW) laser emission at 1.50 micrometers.
    • To investigate a cascade laser scheme utilizing Tm3+ and Ho3+ ions.
    • To overcome the limitations of self-terminating transitions in Tm3+ lasers.

    Main Methods:

    • Utilized a cascade laser scheme involving Tm3+ and Ho3+ ions in a YLiF4 crystal.
    • Employed energy transfer mechanisms to quench the Tm3+ (3)F(4) state.

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  • Depopulated the Ho3+ (5)I(7) state via its 2.06-micrometer laser transition.

    • Main Results:

    • Successfully obtained continuous-wave 1.50-micrometer laser emission.
    • Demonstrated efficient room-temperature operation of the Tm3+ laser.
    • Showcased the effectiveness of the cascade scheme and energy transfer for laser performance.

    Conclusions:

    • The cascade laser scheme is effective for achieving CW 1.50-micrometer emission from Tm3+ ions.
    • Energy transfer to Ho3+ ions facilitates depopulation and enhances laser efficiency.
    • This approach offers a promising route for developing practical room-temperature infrared lasers.