Phosphor material dependent spot size limitations in laser lighting

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

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

In laser lighting, a major benefit over other lighting techniques is the possibility to achieve very high luminous exitance. Focusing the exciting laser to a very small spot size on the phosphor, however, does not necessarily provide a very small emitting area for the white light. In this study we investigate experimentally and numerically the relationship between the white light spot size and the incident blue laser spot size. We show that the specific phosphor material properties have significant impact on this relationship and on the achievable minimum spot size. This constitutes a limitation on the minimum spot size achievable in laser lighting and has important implications in applications.
Original languageEnglish
JournalOptics Express
Volume28
Issue number4
Pages (from-to)5758-5767
ISSN1094-4087
DOIs
Publication statusPublished - 2020

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