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Updated: Jul 9, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Published on: May 30, 2014

Femtosecond optical parametric oscillator based on periodically poled KTiOPO(4).

T Kartalo Lu, K G Köprülü, O Aytür

    Optics Letters
    |December 18, 2007
    PubMed
    Summary

    We developed a femtosecond optical parametric oscillator using a periodically poled potassium titanyl phosphate (PPKTP) crystal. This device efficiently generates tunable visible and infrared light, achieving 22% signal power conversion efficiency.

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    Area of Science:

    • Nonlinear Optics
    • Laser Physics
    • Materials Science

    Background:

    • Femtosecond optical parametric oscillators (OPOs) are crucial for generating tunable ultrashort laser pulses.
    • Periodically poled crystals offer efficient nonlinear frequency conversion via quasi-phase matching.
    • Potassium titanyl phosphate (KTP) is a well-established nonlinear optical material.

    Purpose of the Study:

    • To demonstrate a femtosecond OPO based on a periodically poled KTiOPO4 (PPKTP) crystal.
    • To achieve efficient and tunable output in the visible and infrared spectral regions.
    • To characterize the performance of the PPKTP-based singly resonant OPO (SRO).

    Main Methods:

    • Fabrication of a PPKTP crystal with a 24-microm poling period for quasi-phase matching.

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    Last Updated: Jul 9, 2026

    Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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  • Synchronous pumping of the singly resonant OPO using a Ti:sapphire laser at 758 nm.
  • Characterization of signal (1200 nm) and idler (2060 nm) generation, power conversion efficiency, and tunability.

    • Main Results:

    • The PPKTP-based OPO achieved a maximum signal power conversion efficiency of 22% with 69% pump depletion.
    • Signal wavelength tuning over a 200-nm band was accomplished by adjusting the OPO cavity length.
    • Output tunability in the 1000-1235-nm range was demonstrated through pump wavelength tuning.

    Conclusions:

    • The developed femtosecond PPKTP OPO is a highly efficient source of tunable ultrashort pulses.
    • The device offers broad tunability, making it suitable for various spectroscopic and nonlinear optical applications.
    • Periodically poled KTP is an effective material for femtosecond OPO generation in this wavelength range.