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Spontaneously implemented spatial coherence in vertical-cavity surface-emitting laser dot array.

Tatsushi Hamaguchi1, Tomohiro Makino2, Kentaro Hayashi2

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This summary is machine-generated.

Researchers developed a novel semiconductor laser producing a 47.5 µm coherent beam width. This innovative vertical-cavity surface-emitting laser design expands beam width by synchronizing modes using a unique cavity structure.

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Area of Science:

  • Optoelectronics
  • Semiconductor Physics
  • Laser Technology

Background:

  • Conventional semiconductor lasers, including edge-emitting and vertical-cavity surface-emitting lasers (VCSELs), utilize Fabry-Pérot cavities.
  • Emission and resonance occur in identical directions, inherently limiting beam width to micrometers.

Purpose of the Study:

  • To report a novel self-induced, spatially-coherent dot array of vertical-cavity surface-emitting modes.
  • To achieve a significantly wider emission beam width compared to conventional semiconductor lasers.

Main Methods:

  • Fabrication of an oblong cavity with specific mirror configurations (flat top, cylindrically curved bottom).
  • Incorporation of a perpendicular facet on the side of the cavity to enhance horizontal propagation.
  • Coupling of horizontal propagation with vertical resonance within each dot.

Main Results:

  • A self-induced, spatially-coherent dot array of fourteen vertical-cavity surface-emitting modes was achieved.
  • Spatially uniform spectra were observed across the array.
  • A total beam width of 47.5 µm and a narrow emission angle of 0.5° were obtained.
  • The perpendicular facet synchronized modes, drastically expanding the beam width.

Conclusions:

  • The novel cavity design, particularly the perpendicular facet, successfully synchronizes modes.
  • This synchronization leads to a substantial increase in beam width, overcoming limitations of conventional laser designs.
  • The developed structure offers a promising advancement in semiconductor laser technology for wider beam applications.