Open AccessNew LED-based high-brightness incoherent light source in the SWIR
Author(s) -
Pierre Pichon,
Jean-Philippe Blanchot,
François Balembois,
Patrick Georges
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.009353
Subject(s) - optics , materials science , light emitting diode , brightness , optoelectronics , irradiance , radiance , nonimaging optics , wavelength , concentrator , infrared , energy conversion efficiency , physics
The first LED-pumped luminescent concentrator (LC) emitting in the short-wave infrared (SWIR) is reported. Low cost LEDs (at 940 nm) are used to pump a Yb,Er:Glass LC emitting at 1550 nm. The optical conversion efficiency of the system is optimized and studied in detail for several optical configurations. A total of 128 LEDs having an emitting surface of 1 mm 2 and an irradiance of 51.6 W/cm 2 , corresponding to a total pump power of 66 W, are used. Optimizing the output power out of a 100-mm-long LC in a continuous wave regime, a power of 850 mW is extracted from the 2.5 x 2 mm 2 LC emitting surface area. The optical efficiency is then 1.29%. The performance of this luminescent concentrator is higher by one order of magnitude in term of radiance compared to an LED emitting at the same wavelength.