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Fiber-coupled high-power external-cavity semiconductor lasers for real-time Raman sensing.

M W Pan, G R Gray, L M Smith

    Applied Optics
    |February 21, 2008
    PubMed
    Summary
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    High-power semiconductor lasers with narrow bandwidth were developed for remote sensing. These lasers offer tunable wavelengths and efficient fiber coupling, enabling real-time material analysis.

    Area of Science:

    • Optics and Photonics
    • Semiconductor Lasers
    • Spectroscopy

    Background:

    • External-cavity semiconductor lasers (ECSLs) are crucial for applications requiring specific wavelengths and narrow emission bandwidths.
    • Efficient fiber coupling is essential for delivering laser power to remote sensing targets.
    • Raman spectroscopy offers a non-destructive method for material identification.

    Purpose of the Study:

    • To design and construct high-power, external-cavity semiconductor lasers with narrow spectral linewidth and efficient fiber-coupled output.
    • To characterize the performance of these lasers, including output power, coupling efficiency, linewidth, and tunability.
    • To demonstrate the applicability of these lasers in remote, real-time Raman sensing of materials.

    Main Methods:

    Related Experiment Videos

  • Design and fabrication of external-cavity semiconductor laser architecture.
  • Characterization of laser output power, spectral linewidth, and wavelength tunability.
  • Coupling laser output into a 100-μm multimode fiber.
  • Demonstration of remote real-time Raman sensing using the developed laser system.

    • Main Results:

    • Achieved a high output power of 540 mW coupled into a 100-μm multimode fiber.
    • Obtained a coupling efficiency of 72% at an operating current of 1.1 A.
    • Demonstrated a narrow emission linewidth of 22 GHz.
    • Achieved wavelength tunability across the range of 779.7 to 793.0 nm.
    • Successfully applied the laser system for remote, real-time Raman sensing.

    Conclusions:

    • The developed high-power ECSLs meet the requirements for narrow bandwidth and efficient fiber coupling.
    • These lasers are suitable for remote, real-time Raman sensing applications due to their performance characteristics.
    • The demonstrated tunability and power output open possibilities for advanced spectroscopic analysis.