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Tunable optical microwave source using spatially resolved laser eigenstates.

M Brunel, F Bretenaker, A Le Floch

    Optics Letters
    |March 15, 1997
    PubMed
    Summary
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    A novel solid-state laser design enables widely tunable optical microwave generation up to 26 GHz. This tunable microwave source leverages spatial separation of laser eigenstates and an étalon for precise frequency control.

    Area of Science:

    • Optics and Photonics
    • Solid-State Lasers
    • Microwave Photonics

    Background:

    • Optical microwave generation is crucial for advanced communication and sensing systems.
    • Existing tunable microwave sources often face limitations in tuning range or complexity.
    • Solid-state lasers offer a robust platform for developing novel photonic devices.

    Purpose of the Study:

    • To demonstrate a widely tunable optical microwave source.
    • To investigate the use of a two-propagation-axis solid-state laser for microwave generation.
    • To explore the tunability limits imposed by cavity modes and étalon properties.

    Main Methods:

    • Utilizing a two-propagation-axis solid-state laser architecture.
    • Employing spatial separation of laser eigenstates.

    Related Experiment Videos

  • Implementing an étalon as a coarse tuner to select nonadjacent cavity modes.
  • Analyzing the beat note frequency between selected eigenstates.

    • Main Results:

    • Achieved a widely tunable optical microwave source.
    • Demonstrated continuous tuning of the frequency difference between opposite helicoidal eigenstates.
    • Observed beat note frequencies ranging from DC to 26 GHz.
    • Showcased tunability 30 times the laser's free-spectral range.

    Conclusions:

    • The two-propagation-axis solid-state laser is a viable platform for tunable optical microwave generation.
    • Spatial separation of eigenstates and étalon tuning enable broad frequency control.
    • The demonstrated system offers a significant advancement in tunable microwave sources.