Lasing without cavity

Bruno Sfez, Zvi Kotler, S. Margel, B. Nitzan

Research output: Contribution to journalConference articlepeer-review


Optical gain media filled with strong scatterers present a laser-like emission when optically pumped.Different regimes can be evidenced where amplified spontaneous emission together with multiple scattering play the main role. A mapping technique where both the concentrations of dye molecules and scatterers are independently varied allows to differentiate between those regimes. A simple model based on photon diffusion is presented and threshold for lasing emission is derived, and is compared with the experiment. Qualitative agreement is found, showing that the threshold critically depends on the samples macroscopic size.

Original languageEnglish
Pages (from-to)287-295
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 1997
Event10th Meeting on Optical Engineering in Israel - Jerusalem, Israel
Duration: 2 Mar 19972 Mar 1997


  • Laser
  • Light localization
  • Photon diffusion
  • Random media
  • Scattering


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