Imperial College London


Faculty of EngineeringDepartment of Materials

Reader in Functional Microwave Materials & Devices



+44 (0)20 7594 1410m.oxborrow




2.04Royal School of MinesSouth Kensington Campus






BibTex format

author = {Sathian, J and Breeze, J and Richards, B and Alford, N and Oxborrow, M},
doi = {10.1364/OE.25.013714},
journal = {Optics Express},
pages = {13714--13727},
title = {Solid-state source of intense yellow light based on a Ce:YAG luminescent concentrator},
url = {},
volume = {25},
year = {2017}

RIS format (EndNote, RefMan)

AB - 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.
AU - Sathian,J
AU - Breeze,J
AU - Richards,B
AU - Alford,N
AU - Oxborrow,M
DO - 10.1364/OE.25.013714
EP - 13727
PY - 2017///
SN - 1094-4087
SP - 13714
TI - Solid-state source of intense yellow light based on a Ce:YAG luminescent concentrator
T2 - Optics Express
UR -
UR -
VL - 25
ER -