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Diode-pumped eye-safe laser source exceeding 1% efficiency.

L R Marshall, J Kasinski, R L Burnham

    Optics Letters
    |September 29, 2009
    PubMed
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    Researchers developed an all-solid-state, diode-pumped laser source at 1.61 micrometers. This eye-safe laser achieves high energy conversion efficiency and is scalable for future applications.

    Area of Science:

    • Laser Physics
    • Nonlinear Optics
    • Solid-State Lasers

    Background:

    • Diode-pumped lasers offer efficient and compact solutions for various applications.
    • Eye-safe laser sources are crucial for applications where human exposure is possible.
    • Optical Parametric Oscillators (OPOs) provide tunable laser output.

    Purpose of the Study:

    • To develop an all-solid-state, diode-pumped, eye-safe laser source operating at 1.61 micrometers.
    • To investigate the performance and scalability of a KTP-based optical parametric oscillator (OPO).
    • To achieve high energy conversion efficiency for the generated laser signal.

    Main Methods:

    • Utilized a Nd:YAG laser as the pump source.
    • Employed a noncritically phase-matched Potassium Titanyl Phosphate (KTP) crystal in an optical parametric oscillator (OPO) configuration.

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  • Investigated tunability by rotating the KTP crystal.

    • Main Results:

    • Achieved total energy conversion efficiencies approaching 50% from the 1.064-micrometer pump to the 1.61-micrometer signal and 3.1-micrometer idler.
    • Demonstrated 35% energy conversion efficiency specifically to the 1.61-micrometer signal.
    • Produced 1.6 mJ of energy at 1.61 micrometers with a wallplug efficiency of 1.1%.
    • Obtained tunability from 1.6 to 1.54 micrometers.

    Conclusions:

    • The developed all-solid-state, diode-pumped laser source is eye-safe and efficient.
    • The KTP-based OPO system demonstrates high performance and is readily scalable to higher energies.
    • Noncritical phase matching in KTP enables efficient generation of eye-safe laser wavelengths.