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In-amplifier mid-infrared supercontinuum generation.

Jean-Christophe Gauthier, Vincent Fortin, Simon Duval

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    Researchers demonstrated mid-infrared supercontinuum (SC) generation using an erbium-doped fiber amplifier. This novel approach efficiently produces broadband light, particularly in the 3-5 μm range, for compact source development.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Mid-infrared (MIR) light sources are crucial for various applications, including spectroscopy and sensing.
    • Generating broadband MIR supercontinuum (SC) light efficiently and compactly remains a challenge.

    Purpose of the Study:

    • To demonstrate a novel and simple method for generating MIR SC in an erbium-doped fluoride fiber amplifier.
    • To achieve efficient SC generation in the 3-5 μm atmospheric transmission window.

    Main Methods:

    • Utilizing a single-mode erbium-doped fluoride glass fiber amplifier.
    • Pumping the amplifier at 976 nm.
    • Seeding with an optical parametric generation (OPG) source emitting 400 ps pulses at 2.75 μm.

    Main Results:

    • Achieved mid-infrared supercontinuum generation spanning from 2.6 to 4.1 μm.
    • Demonstrated that up to 82% of the SC power is generated beyond 3 μm.
    • Showcased a simple and effective in-amplifier SC generation approach.

    Conclusions:

    • The demonstrated in-amplifier SC generation is a promising technique for developing compact and efficient MIR sources.
    • This method is particularly suitable for applications requiring light in the 3-5 μm band.
    • The simplicity and efficiency of the approach pave the way for practical MIR instrumentation.