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Related Experiment Video

Updated: Jul 7, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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Mid-Infrared-Wavelength Generation in 2-mum Pumped Periodically Poled Lithium Niobate.

G Hansson, D D Smith

    Applied Optics
    |February 21, 2008
    PubMed
    Summary

    A periodically poled lithium niobate optical parametric oscillator was demonstrated using a Tm:YAG laser. This system efficiently generated tunable signal and idler wavelengths, showcasing broad tuning capabilities for various applications.

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    Area of Science:

    • Nonlinear optics
    • Laser physics
    • Materials science

    Background:

    • Periodically poled lithium niobate (PPLN) is a key material for nonlinear optical frequency conversion.
    • Optical parametric oscillators (OPOs) are versatile sources of tunable coherent radiation.
    • Thulium-doped Yttrium Aluminum Garnet (Tm:YAG) lasers offer efficient pumping in the mid-infrared region.

    Purpose of the Study:

    • To demonstrate a PPLN optical parametric oscillator (OPO) pumped by a Tm:YAG laser.
    • To investigate the tuning characteristics of the PPLN OPO.
    • To achieve efficient generation of signal and idler wavelengths in the mid-infrared spectrum.

    Main Methods:

    • Utilized a periodically poled lithium niobate crystal.
    • Employed a Tm:YAG laser operating at a 2.0124-μm wavelength for pumping.

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    Last Updated: Jul 7, 2026

    Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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  • Varied the domain period length of the PPLN grating and the crystal temperature for tuning.

    • Main Results:

    • Achieved a pump pulse energy of 5.1 mJ, resulting in 0.65 mJ of signal and idler pulse energy at 50 Hz.
    • Generated signal and idler wavelengths of 3.61 μm and 4.55 μm, respectively, at 180°C.
    • Demonstrated wide wavelength tuning from 3.26–3.76 μm (signal) and 4.33–5.34 μm (idler) by adjusting domain period and temperature.

    Conclusions:

    • The demonstrated PPLN OPO is an effective source for generating tunable mid-infrared radiation.
    • The system exhibits broad tunability, making it suitable for various spectroscopic and sensing applications.
    • Further optimization of PPLN OPO parameters can lead to even higher efficiencies and broader wavelength coverage.