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Efficient blue cw Nd:YAG microchip laser with two intracavity frequency doublers.

V Gaebler, B Liu, H J Eichler

    Optics Letters
    |December 11, 2007
    PubMed
    Summary

    Researchers developed a compact blue laser using a Nd:YAG-KNbO3 microchip cavity. This novel laser achieves 30 mW output power at 473 nm and offers tunable mode operation with low noise.

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    Area of Science:

    • Laser Physics
    • Nonlinear Optics
    • Solid-State Lasers

    Background:

    • Development of compact and efficient solid-state lasers is crucial for various applications.
    • Frequency-doubled lasers offer compact solutions for generating visible light.
    • Potassium niobate (KNbO3) is a well-known material for nonlinear optical applications, including frequency doubling.

    Purpose of the Study:

    • To present a novel half-monolithic microchip laser cavity.
    • To achieve efficient blue light generation at 473 nm.
    • To demonstrate tunable longitudinal mode operation in a compact laser system.

    Main Methods:

    • Fabrication of a half-monolithic microchip laser cavity integrating Nd:YAG and KNbO3.
    • Utilizing a 1-W, 808-nm diode laser for pumping.

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  • Employing a second KNbO3 crystal for frequency doubling, with angular tuning for mode control.

    • Main Results:

    • Achieved an output power of up to 30 mW at 473 nm.
    • Demonstrated successful operation in both single-longitudinal and multi-longitudinal modes.
    • Observed continuous-wave (cw) output noise below 2% in both operational modes.

    Conclusions:

    • The presented microchip laser design offers an efficient and compact source of blue light.
    • Tunable mode operation is readily achievable by adjusting the orientation of the nonlinear crystal.
    • The system exhibits low noise characteristics, making it suitable for various optical applications.