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Efficient high-power continuous-wave multi-slab Fe:ZnSe laser at 4.1 μm.

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    This summary is machine-generated.

    This study demonstrates a high-efficiency cryogenically cooled iron-doped zinc selenide (Fe2+:ZnSe) laser operating continuously at 4.167 µm. The novel four-slab design achieves near diffraction-limited beam quality and efficient mid-infrared power scaling.

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    Area of Science:

    • Mid-infrared laser technology
    • Solid-state laser development
    • Materials science for optoelectronics

    Background:

    • Efficient mid-infrared (MIR) lasers are crucial for various applications, including spectroscopy, free-space communications, and medical diagnostics.
    • Iron-doped zinc selenide (Fe2+:ZnSe) crystals are promising gain media for MIR lasers due to their broad emission bandwidth.
    • Challenges in MIR laser development include thermal management and achieving high power output.

    Purpose of the Study:

    • To report high-efficiency continuous-wave (CW) operation of a cryogenically cooled Fe2+:ZnSe laser.
    • To investigate a novel four-slab configuration for optimized pump absorption and gain distribution.
    • To demonstrate efficient mid-infrared power scaling and assess beam quality.

    Main Methods:

    • Utilized a four-slab Fe2+:ZnSe configuration (2.75 mm each) with a doping concentration of 4.3–7.9 × 10^18 cm^-3.
    • Cooled the laser system to 90 K for optimal performance.
    • Employed double-end pumping at 2.832 µm using two fiber-bulk hybrid Cr:ZnSe lasers (17 W and 13 W).

    Main Results:

    • Achieved complete pump absorption (ηa ≈ 99.68%) and delivered 13.9 W of output power.
    • Obtained a high slope efficiency of 41%.
    • Demonstrated near diffraction-limited beam quality (Mx²=1.13±0.11, My²=1.24±0.12) and observed wavelength red-shift from 4.036 to 4.167 µm with increasing power.

    Conclusions:

    • The cryogenically cooled Fe2+:ZnSe laser in a four-slab configuration provides high efficiency and good beam quality.
    • The architecture effectively mitigates thermal lensing, enabling efficient mid-infrared power scaling.
    • This approach advances the development of powerful and reliable MIR laser sources.