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Compact self-cascaded KTA-OPO for 2.6 μm laser generation.

Yanmin Duan, Haiyong Zhu, Changwen Xu

    Optics Express
    |November 19, 2016
    PubMed
    Summary

    We developed a compact laser source for generating 2.6 μm coherent light using a self-cascaded potassium titanyl arsenate (KTA) optical parametric oscillator (OPO). This system demonstrates efficient mid-infrared laser generation for potential applications.

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    Area of Science:

    • Laser Physics and Photonics
    • Mid-Infrared (MIR) Light Generation
    • Nonlinear Optics

    Background:

    • Efficient generation of coherent light in the mid-infrared (2.6 μm) is crucial for various applications, including spectroscopy and sensing.
    • Optical Parametric Oscillators (OPOs) are versatile sources for tunable coherent light, but compact and robust designs for specific wavelengths remain a challenge.
    • Potassium titanyl arsenate (KTA) is a nonlinear optical crystal suitable for frequency conversion.

    Purpose of the Study:

    • To develop a compact and efficient laser source for generating coherent light at 2.6 μm.
    • To investigate the feasibility of a self-cascaded KTA-OPO system for mid-infrared generation.
    • To optimize the performance of the diode-pumped, Q-switched laser-driven OPO.

    Main Methods:

    • A diode end-pumped, Q-switched Nd:YVO4 laser was used to drive a potassium titanyl arsenate (KTA) optical parametric oscillator (OPO).
    • The OPO utilized a self-cascaded process with non-critical phase matching within a single KTA crystal.
    • The system was characterized by measuring output power, wavelength, slope efficiency, and power fluctuation under varying diode pump power and repetition frequency.

    Main Results:

    • The self-cascaded KTA-OPO successfully generated coherent light at 2.59 μm.
    • A maximum average output power of 445 mW was achieved at an incident diode pump power of 8.7 W and a pulse repetition frequency of 60 kHz.
    • The OPO exhibited a slope efficiency of approximately 12.7% with power fluctuations below 8%.

    Conclusions:

    • The self-cascade OPO based on KTA provides a promising scheme for rugged and compact mid-infrared 2.6 μm laser generation.
    • This approach offers an efficient method for producing specific mid-infrared wavelengths.
    • The demonstrated performance indicates the potential of this compact laser source for practical applications.