Solid-state source of intense yellow light based on a Ce:YAG luminescent concentrator

Juna Sathian, Jonathan D. Breeze, Benjamin Richards, Neil McN. Alford, Mark Oxborrow

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)
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Abstract

A luminescent concentrator functioning as a bright source of yellow light is reported. It comprises a waveguide made of cerium-doped YAG crystal, in the form of a long-thin rectangular strip, surrounded by flowing air and optically pumped from both sides with blue light from arrays of high-efficiency InGaN LEDs. Phosphor-converted yellow light, generated within the strip, is guided to a glass taper that is butt-coupled to one of the strip’s end faces. Up to 20 W of optical power, centered on 575 nm with a linewidth of 76 nm, can be continuously radiated into air from the taper’s 1.67 mm × 1.67 mm square output aperture. The intensity of the outputted light is significantly greater than what any yellow (AlGaInP) LED can directly produce (either singly or arrayed), with only a modest increase in linewidth. Furthermore, the wall-plug efficiency of the source exceeds that of any yellow laser. The concept allows for further substantial increases in intensity, total output power and wall-plug efficiency through scaling-up and engineering refinements.
Original languageEnglish
Pages (from-to)13714-13727
JournalOptics Express
Volume25
Issue number12
Early online date8 Jun 2017
DOIs
Publication statusPublished - 12 Jun 2017
Externally publishedYes

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