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High-resolution (Doppler-limited) spectroscopy using quantum-cascade distributed-feedback lasers.

S W Sharpe, J F Kelly, J S Hartman

    Optics Letters
    |December 20, 2007
    PubMed
    Summary
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    Distributed-feedback quantum-cascade (QC) lasers show promise for high-resolution spectroscopy. These lasers offer excellent linewidths and frequency reproducibility for applications like molecular absorption and lidar.

    Area of Science:

    • Spectroscopy
    • Laser Physics
    • Quantum Optics

    Background:

    • Distributed-feedback quantum-cascade (QC) lasers are a novel technology with potential applications in high-resolution spectroscopy.
    • Continuous-wave operation at cryogenic temperatures is crucial for sensitive measurements.

    Purpose of the Study:

    • To evaluate the lasing characteristics of QC lasers for spectroscopic applications.
    • To determine the suitability of QC lasers for Doppler-limited molecular absorption and pressure-limited lidar.

    Main Methods:

    • Continuous-wave operation of QC lasers at cryogenic temperatures.
    • Rapid-scan technique for direct absorbance measurements.
    • Spectroscopic analysis of nitric oxide (NO) and ammonia (NH3) using QC lasers at 5.2 and 8.5 micrometers.

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    Main Results:

    • Time-averaged linewidths better than 40 MHz.
    • Long-term frequency reproducibility of 80 MHz or better across temperature cycles.
    • Achieved tuning rates of 2.5 cm(-1) in 0.6 ms.
    • Obtained noise-equivalent absorbance of 3 x 10(-6) without optical optimization.

    Conclusions:

    • QC lasers demonstrate excellent performance for high-resolution spectroscopic applications.
    • The lasers exhibit narrow linewidths, high frequency stability, and rapid tuning capabilities.
    • These characteristics make QC lasers suitable for sensitive molecular detection and lidar systems.