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Related Experiment Video

Updated: Jul 9, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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High-power, continuous-wave, current-tunable, single-mode quantum-cascade distributed-feedback lasers at lambda - 5.2

C Gmachl, F Capasso, A Tredicucci

    Optics Letters
    |December 7, 2007
    PubMed
    Summary
    This summary is machine-generated.

    High-power quantum-cascade lasers offer tunable, single-mode emission near 5.2 and 7.95 µm. These devices operate above liquid-nitrogen temperature and are ideal for sensitive gas sensing.

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    Last Updated: Jul 9, 2026

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    Published on: November 22, 2019

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    Published on: August 5, 2013

    Area of Science:

    • Optoelectronics
    • Quantum Cascade Lasers
    • Semiconductor Devices

    Background:

    • Quantum cascade lasers (QCLs) are crucial for mid-infrared applications.
    • Achieving high-power, tunable, single-mode emission from QCLs remains a key challenge.

    Purpose of the Study:

    • To report on the development of high-power, continuous-wave (cw), tunable, single-mode quantum-cascade distributed-feedback (QCDC) lasers.
    • To demonstrate their performance at liquid-nitrogen temperature and above for gas-sensing applications.

    Main Methods:

    • Fabrication of QCDC lasers with emission wavelengths near 5.2 and 7.95 µm.
    • Optimization of peak gain positioning relative to Bragg wavelength for enhanced output power.
    • Characterization of continuous tuning capabilities via heat-sink temperature and current adjustments.

    Main Results:

    • Achieved maximum output power exceeding 100 mW per facet at 80 K for both 5.2 and 7.95 µm wavelengths.
    • Demonstrated continuous tuning coefficients of 0.35 nm/K (5.2 µm) and 0.51 nm/K (7.95 µm) for thermal tuning.
    • Observed current tuning coefficients ranging from 20 to 40 nm/A.

    Conclusions:

    • The developed QCDC lasers provide high-power, tunable, single-mode emission suitable for demanding applications.
    • These lasers are successfully employed in high-resolution and high-sensitivity gas-sensing systems.
    • The results highlight the potential of QCDC lasers for advanced spectroscopic measurements.