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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Noncollinear-pumped KTP optical parametric oscillator.

M Gong1, Z Li, J Wang

  • 1Digital Photonics Laboratory, Department of Precision Instruments, Tsinghua University, Beijing 100084, China. gongml@mail.tsinghua.edu.cn

Applied Optics
|March 8, 2008
PubMed
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This study demonstrates high energy conversion efficiency in noncollinearly pumped optical parametric oscillators (OPOs). Utilizing a potassium titanyl phosphate (KTP) OPO, researchers achieved a 31% conversion efficiency for eye-safe laser output.

Area of Science:

  • Nonlinear Optics
  • Laser Physics

Background:

  • Optical Parametric Oscillators (OPOs) are crucial for generating tunable laser light.
  • Phase-matching is essential for efficient OPO operation.
  • Noncollinear pumping offers potential advantages but requires careful analysis.

Purpose of the Study:

  • To theoretically analyze and experimentally investigate the phase-matching condition in noncollinearly pumped OPOs.
  • To explore the benefits of noncollinear pumping in a potassium titanyl phosphate (KTP) OPO.
  • To achieve high energy conversion efficiency and a low pump threshold.

Main Methods:

  • Theoretical analysis of phase-matching conditions for noncollinearly pumped OPOs.
  • Experimental implementation using a noncritically phase-matched KTP OPO.

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  • Double-pass, singly resonant cavity design.

    • Main Results:

    • Demonstrated coherent signal wave generation in noncollinearly pumped OPOs, leading to high conversion efficiency.
    • Achieved 31% energy conversion efficiency from a 1064-nm pump to 1572-nm eye-safe output.
    • Eliminated the need for optical isolators by design, simplifying the experimental setup.

    Conclusions:

    • Noncollinearly pumped, double-pass, singly resonant OPOs maintain round-trip parametric gain advantages.
    • The KTP OPO system provides efficient generation of eye-safe laser wavelengths.
    • The noncollinear pumping geometry simplifies system design and enhances efficiency.