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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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Single-frequency, end-pumped Nd:YLF laser excited by a 12-mJ diode-laser array.

C F Rae, J A Terry, B D Sinclair

    Optics Letters
    |October 3, 2009
    PubMed
    Summary

    A diode-laser-pumped neodymium-doped yttrium lithium fluoride (Nd:YLF) laser achieved over 2 mJ pulse energy and 118 kW peak power. This laser system also enabled efficient optical parametric oscillator operation.

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    Area of Science:

    • Laser physics
    • Nonlinear optics
    • Solid-state lasers

    Background:

    • Diode-laser pumping offers an efficient method for exciting solid-state laser gain media.
    • Neodymium-doped yttrium lithium fluoride (Nd:YLF) lasers are suitable for high-energy pulsed applications.
    • Optical parametric oscillators (OPOs) are versatile sources for generating tunable laser light.

    Purpose of the Study:

    • To report the development and performance of a diode-laser-pumped Nd:YLF laser.
    • To investigate the Q-switching characteristics of the Nd:YLF laser.
    • To demonstrate the use of this laser as a pump source for a singly resonant optical parametric oscillator (SRO).

    Main Methods:

    • Utilized a 12-mJ, 60-W quasicw diode-laser bar for end-pumping an Nd:YLF laser rod.

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  • Employed Q-switching techniques, including prelase Q-switching, to achieve high peak powers.
  • Pumped a potassium titanyl phosphate (KTP) crystal within a singly resonant cavity to generate parametric oscillation.

    • Main Results:

    • Achieved multilongitudinal-mode, TEM(00) pulse energies exceeding 2 mJ.
    • Observed Q-switched peak output powers greater than 118 kW.
    • Demonstrated single-longitudinal-mode peak powers exceeding 90 kW using prelase Q-switching.
    • Reported low-threshold operation of a KTP OPO at 1.539 micrometers pumped by the Nd:YLF laser.

    Conclusions:

    • The diode-laser-pumped Nd:YLF laser provides a high-energy, high-peak-power source.
    • Q-switching techniques effectively enhance the peak power of the Nd:YLF laser.
    • The developed Nd:YLF laser is a viable pump source for efficient optical parametric oscillation.