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Related Concept Videos

IR Spectrometers01:25

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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Highly efficient mid-infrared difference-frequency generation using synchronously pulsed fiber lasers.

R T Murray, T H Runcorn, E J R Kelleher

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    This summary is machine-generated.

    We developed a high-power, picosecond-pulse, mid-infrared light source using difference-frequency generation (DFG). This tunable source delivers over 3.4 W of average power with high efficiency.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Nonlinear Optics

    Background:

    • Mid-infrared light sources are crucial for spectroscopy and sensing.
    • Difference-frequency generation (DFG) is a key technique for generating tunable mid-infrared radiation.
    • Existing DFG sources often face limitations in average power and efficiency.

    Purpose of the Study:

    • To develop a high average power, picosecond-pulse, mid-infrared source.
    • To investigate the performance of synchronously pumped fiber amplifier systems for DFG.
    • To compare synchronously pumped DFG with continuous-wave (CW) seeded DFG.

    Main Methods:

    • Utilized two synchronous master oscillator power fiber amplifier systems.
    • Employed difference-frequency generation (DFG) to produce mid-infrared radiation.
    • Tuned the idler output wavelength across the 3.28-3.45 μm range.

    Main Results:

    • Achieved a tunable mid-infrared source with average power exceeding 3.4 W.
    • Demonstrated a maximum pump to total DFG power conversion efficiency of 78%.
    • Generated picosecond pulses in the mid-infrared spectrum.

    Conclusions:

    • The synchronously pumped DFG scheme offers significant advantages for high-power mid-infrared generation.
    • The developed source provides a versatile and efficient tool for various applications.
    • Further exploration of synchronously pumped systems is warranted for advanced light source development.