Low Etendue Yellow-Green Solid-State Light Generation by Laser-pumped LuAG: Ce Ceramic

Kang Li, Yun Shi, Fuqiang Jia, Chris Price, Yongkang Gong, Jungang Huang, Nigel Copner, Hui Cao, Lingzhen Yang, Shuo Chen, Haohong Chen, Chang Jiang Li

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A low Etendue (6.1 mm2) 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 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/e2 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.

Original languageEnglish
Pages (from-to)939-942
JournalIEEE Photonics Technology Letters
Issue number10
Publication statusPublished - 15 May 2018


  • Ceramics
  • diode laser
  • Laser beams
  • Laser excitation
  • Light sources
  • Measurement by laser beam
  • Mirrors
  • optical pumping
  • phosphor ceramic
  • Phosphors
  • photoluminescence


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