Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 30, Issue 10, Pages 939-942Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2018.2813520
Keywords
Light sources; photoluminescence; phosphor ceramic; optical pumping; diode laser
Funding
- Foshan Technology Innovation Group Project (Advanced Solid-State Light Source Application and Innovation Team)
- National Natural Science Foundation of China [61475175, 6141130132]
- Natural Science Foundation of Guangdong Province, China [2015A030313633]
- Key Project of Education Department of Guangdong Province [2014KTSCX153]
- Fundamental Research Funds of Foshan University [2014042]
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A low Etendue (6.1 mm(2)) yellow-green solid-state light source with optical conversion efficiency up to 101.3 lumen/Watt is demonstrated by through high-power laser diode pumping of a static LuAG:Ce transparent ceramic plate. A 443-nm blue laser diode array with a full-width-half-maximum (FWHM) of <1.5 nm and a maximum output power of 15.2 W is used to attain a high spectral absorption efficiency. The output from the high-power laser diode array is collimated, shaped, despeckled, and focused to display a Gaussian-like profile with a 1.5-mm beam waist (1/e(2) radius) to stimulate a 1.2-mm thick LuAG:Ce transparent ceramic plate with an emission FWHM spectra at 505-585 nm. No thermal quenching, pump absorption saturation, and obvious luminous flux decrease is found during test.
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