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Ramy G S El-Dardiry1, Allard P Mosk, Ad Lagendijk

  • 1FOM-Institute for Atomic and Molecular Physics (AMOLF), Science Park 104, 1098 XG Amsterdam, The Netherlands. dardiry@amolf.nl

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Summary
This summary is machine-generated.

This study reveals how light behaves in scattering materials with optical gain, identifying a new method to detect random laser thresholds by analyzing light emission patterns.

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Area of Science:

  • Optics and Photonics
  • Condensed Matter Physics
  • Laser Physics

Background:

  • Understanding light transport in scattering media is crucial for applications like imaging and sensing.
  • Optical gain introduces complex phenomena, including the potential for random laser emission.
  • Characterizing the transition to lasing in such systems remains a challenge.

Purpose of the Study:

  • To experimentally and numerically investigate light transport and generation in multiple scattering media with optical gain.
  • To develop and validate a novel, accessible method for identifying the random laser threshold.
  • To analyze the spatial distribution of light emission as an indicator of propagation depth and lasing behavior.

Main Methods:

  • Experimental imaging of light escaping from the side of a scattering sample with optical gain.
  • Numerical simulations solving coupled time-dependent diffusion equations on a nonuniform grid.
  • Analysis of the spatial profile of emission light at various pump intensities.

Main Results:

  • The spatial profile of emission light is independent of pump intensity far below and above the random laser threshold.
  • A profound change in the spatial distribution of emission light is observed around the random laser threshold.
  • Numerical solutions accurately explain the observed experimental phenomena.

Conclusions:

  • The spatial emission profile serves as a sensitive indicator of the random laser threshold.
  • This study presents a new, straightforward method for observing random laser threshold phenomena.
  • The findings contribute to a deeper understanding of light propagation and emission in gain-};media.