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Related Experiment Videos

Multifunctional gratings for surface-emitting lasers: design and implementation.

Peter Modh1, Johan Backlund, Jörgen Bengtsson

  • 1Microtechnology Center at Chalmers, Photonics Laboratory, Department of Microelectronics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden. modh@elm.chalmers.se

Applied Optics
|September 4, 2003
PubMed
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Researchers developed multifunctional grating couplers for surface-emitting lasers, enhancing beam quality and enabling advanced beam profiles. This innovation improves laser performance and beam shaping capabilities.

Area of Science:

  • Optics and Photonics
  • Laser Physics

Background:

  • Grating-based unstable resonator lasers require precise control over feedback and outcoupling for optimal performance.
  • Existing grating couplers often lack the multifunctionality needed for simultaneous beam shaping and resonator stabilization.

Purpose of the Study:

  • To experimentally demonstrate novel multifunctional grating couplers for surface-emitting lasers.
  • To achieve improved beam quality and advanced beam profiles through simultaneous optimization of feedback and outcoupling.
  • To introduce a new design method for grating couplers enabling arbitrary control over optical characteristics.

Main Methods:

  • Design and fabrication of two distinct multifunctional grating couplers for grating-coupled surface-emitting lasers.
  • Integration of couplers into unstable resonator laser systems.

Related Experiment Videos

  • Experimental characterization of laser output beam quality and profile.

    • Main Results:

    • The first coupler successfully reduced unwanted resonator feedback and shaped the output into a four-spot beam.
    • The second coupler provided necessary feedback for unstable resonator operation while focusing the output to a single spot.
    • Both couplers achieved near-diffraction-limited output spots, a significant improvement over previous designs.

    Conclusions:

    • Multifunctional grating couplers represent a novel approach for enhancing surface-emitting laser performance.
    • This technology enables simultaneous control over feedback, outcoupling, and beam shaping, leading to superior beam quality.
    • The demonstrated couplers offer a significant advancement in the field of grating-coupled lasers.