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Low-pump-threshold continuous-wave singly resonant optical parametric oscillator.

D J Stothard, M Ebrahimzadeh, M H Dunn

    Optics Letters
    |December 20, 2007
    PubMed
    Summary
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    We developed a compact, all-solid-state optical parametric oscillator (SRO) requiring minimal pump power. This efficient device operates robustly and offers tunable mid-infrared output, ideal for various applications.

    Area of Science:

    • Optics and Photonics
    • Nonlinear Optics
    • Laser Technology

    Background:

    • Optical parametric oscillators (SROs) are crucial for generating tunable laser light.
    • Miniature, low-power, and robust SROs are highly desirable for practical applications.
    • Previous SRO designs often required higher pump powers and complex setups.

    Purpose of the Study:

    • To demonstrate a compact, all-solid-state continuous-wave singly resonant optical parametric oscillator (SRO) with significantly reduced pump-power requirements.
    • To achieve efficient operation and broad tunability in the mid-infrared region.
    • To develop a robust, turnkey system with stable performance.

    Main Methods:

    • Utilized periodically poled lithium niobate (PPLN) as the nonlinear material.

    Related Experiment Videos

  • Employed intracavity pumping within a 50-mm crystal.
  • Pumped the SRO using a 1-W diode-pumped Nd:YVO4 minilaser at 1.064 µm.

    • Main Results:

    • Achieved SRO operation threshold at a low diode pump power of 310 mW.
    • Delivered 70 mW of idler output power at 3.66 µm with 55% photon conversion efficiency at 1 W input power.
    • Demonstrated multiparameter tuning, yielding signal wavelengths from 1.45 to 1.60 µm and idler wavelengths from 3.16 to 4.02 µm.

    Conclusions:

    • The developed compact SRO offers a low-threshold, high-efficiency, and tunable source in the mid-infrared.
    • The device exhibits robust turnkey operation and long-term amplitude stability.
    • This work presents a significant advancement in miniaturized, low-power parametric oscillator technology.