Limitations to emission spot size in laser lighting

Ole Bjarlin Jensen*, Anastasiia Krasnoshchoka, Anders Kragh Hansen, Anders Thorseth, Dominik Marti, Xu Jian, Paul Michael Petersen

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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Laser lighting is an emerging technology to generate high luminance lighting. To achieve high luminance or high luminous exitance, the light emitter must have high flux and small size simultaneously. When laser light is focused to a small spot size on the phosphor material, the two main limitations are saturation of the phosphor material and the spot size of the generated light. Here, we investigate experimentally and numerically the spot size of laser lighting dependent on the spot size of the incident laser light and the material properties of the wavelength converting phosphor material. We find numerically that the spot size of the generated white light is significantly influenced by the phosphor properties. The spot size of the white light determines the étendue and thereby the possibility to collect and shape the light. This has important implications in applications of laser lighting.
Original languageEnglish
Title of host publicationProceedings of SPIE
Number of pages7
PublisherSPIE - International Society for Optical Engineering
Publication date2020
Article number113020B
Publication statusPublished - 2020
EventSPIE OPTO 2020 - Moscone Convention Center, San Francisco, United States
Duration: 1 Feb 20206 Feb 2020


ConferenceSPIE OPTO 2020
LocationMoscone Convention Center
Country/TerritoryUnited States
CitySan Francisco
SeriesProceedings of S P I E - International Society for Optical Engineering


  • Laser lighting
  • spot size
  • Phosphor materials


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