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Narrow-linewidth diode laser using a fiber-optic ring resonator.

T J Paul, E A Swanson

    Optics Letters
    |October 14, 2009
    PubMed
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    Researchers achieved ultra-narrow linewidths in AlGaAs diode lasers using fiber-optic ring resonators. This breakthrough enables stable frequency locking and advanced optical applications, demonstrating a laser linewidth as low as 0.6 Hz.

    Area of Science:

    • Optics and Photonics
    • Semiconductor Lasers
    • Fiber Optics

    Background:

    • Achieving narrow linewidths in semiconductor lasers is crucial for high-resolution spectroscopy and optical communications.
    • AlGaAs diode lasers are widely used but typically exhibit broader linewidths compared to other laser types.
    • Fiber-optic ring resonators offer potential for frequency selectivity and linewidth narrowing.

    Purpose of the Study:

    • To experimentally demonstrate linewidth reduction in AlGaAs diode lasers.
    • To investigate the use of frequency-selective Rayleigh scattering in a fiber-optic ring resonator for linewidth narrowing.
    • To assess the frequency stability and tuning capabilities of the developed narrow-linewidth lasers.

    Main Methods:

    • Utilizing a fiber-optic ring resonator with frequency-selective Rayleigh scattering.

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  • Employing two AlGaAs diode lasers coupled to the resonator.
  • Performing self-homodyning measurements to determine laser linewidth.
  • Observing intermediate-frequency beat signals and using a Fabry-Perot interferometer for stability and tuning analysis.
  • Locking a heterodyne optical phase-locked loop.

    • Main Results:

    • Demonstrated significant linewidth reduction in AlGaAs diode lasers.
    • Achieved an intermediate-frequency linewidth of less than 100 Hz for two lasers.
    • Estimated an ultra-narrow laser linewidth of 0.6 Hz via self-homodyning.
    • Confirmed frequency mode stability and tuning capabilities.
    • Successfully locked a heterodyne optical phase-locked loop.
    • Observed stimulated Brillouin scattering from the narrow-linewidth ring laser.

    Conclusions:

    • Frequency-selective Rayleigh scattering in a fiber-optic ring resonator is an effective method for achieving ultra-narrow linewidths in AlGaAs diode lasers.
    • The developed narrow-linewidth lasers exhibit excellent frequency stability and tuning, suitable for advanced optical systems.
    • This technique opens possibilities for enhanced precision in optical measurements and communications.