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Eigenmode analysis of phased-coupled VCSEL arrays using spatial coherence measurements.

Elodie Lamothe1, Lars D A Lundeberg, Eli Kapon

  • 1Ecole Polytechnique Federale de Lausanne, Laboratory of Physics of Nanostructures, 1015 Lausanne, Switzerland. elodie.lamothe@epfl.ch

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Summary

We used modal coherence theory to analyze laser arrays. This method reveals how optical disorder and spatial hole burning affect laser mode structure, offering insights into laser array performance.

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Area of Science:

  • Optics and Photonics
  • Semiconductor Lasers
  • Laser Array Physics

Background:

  • Vertical Cavity Surface Emitting Lasers (VCSELs) are crucial semiconductor devices.
  • Phase-coupled VCSEL arrays offer enhanced power and beam quality.
  • Understanding the spatial mode structure is key to optimizing array performance.

Purpose of the Study:

  • To evaluate the spatial mode structure of a 2x2 phase-coupled VCSEL array.
  • To investigate the influence of pump current on eigenmode structure.
  • To assess the impact of optical disorder and spatial hole burning on modal discrimination.

Main Methods:

  • Application of the modal coherence theory.
  • Measurement of the degree of spatial coherence for all VCSEL pairs.
  • Extraction of eigenmode structures at varying pump currents.

Main Results:

  • The study successfully extracted the eigenmode structure of the VCSEL array.
  • Modal coherence analysis revealed the effects of optical disorder.
  • Spatial hole burning was shown to impact modal discrimination.

Conclusions:

  • The modal coherence theory provides an effective method for evaluating VCSEL array spatial mode content.
  • The findings highlight the detrimental effects of optical disorder and spatial hole burning.
  • This approach is broadly applicable to other laser array systems.