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Related Experiment Video

Updated: Jul 9, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Compact low-threshold Q-switched intracavity optical parametric oscillator.

R S Conroy, C F Rae, G J Friel

    Optics Letters
    |December 20, 2007
    PubMed
    Summary

    We developed a compact, low-threshold optical parametric oscillator using a novel Q switch design. This device efficiently generates tunable, single-frequency infrared pulses for various applications.

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    Area of Science:

    • Photonics and Laser Technology
    • Nonlinear Optics
    • Materials Science

    Background:

    • Intracavity optical parametric oscillators (OPOs) offer efficient wavelength conversion.
    • Microchip laser designs provide compact and robust laser sources.
    • Potassium Titanyl Phosphate (KTiOPO4 or KTP) is a widely used nonlinear optical crystal.

    Purpose of the Study:

    • To develop a compact, low-threshold singly resonant pulsed intracavity optical parametric oscillator.
    • To investigate the performance of a novel quadrupole deflector Q switch in a microchip laser design.
    • To achieve efficient generation of tunable, single-frequency infrared pulses.

    Main Methods:

    • Utilized a semi-monolithic microchip laser design incorporating a KTiOPO4 crystal.

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    Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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  • Employed a novel quadrupole deflector Q switch for pulsed operation.
  • Pumped the system with a 2-W laser diode at 1.064 microm.

    • Main Results:

    • Achieved a low threshold of 1.3 W for the optical parametric oscillator.
    • Generated 0.4-microJ signal pulses with 5.6-ns duration at 1.53 microm.
    • Obtained diffraction-limited, single-frequency signal pulses at a 5 kHz repetition rate.

    Conclusions:

    • The developed intracavity OPO demonstrates high efficiency and compactness.
    • The novel Q switch design enables low-threshold, high-quality pulse generation.
    • This compact OPO system is suitable for applications requiring tunable, single-frequency infrared light.