Open AccessSimple and efficient defect-tailored fiber-based UV-VIS broadband white light generation
Author(s) -
ChienChih Lai,
Nai-Chia Cheng,
Cheng-Kai Wang,
Jeng-Wei Tjiu,
Ming-Yi Lin,
Sheng-Yang Huang
Publication year - 2013
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.21.014606
Subject(s) - materials science , chromaticity , sapphire , optoelectronics , optics , luminescence , borosilicate glass , ultraviolet , laser , cladding (metalworking) , color rendering index , phosphor , physics , metallurgy , composite material
We propose and demonstrate a facile approach for ultraviolet-visible broadband generation from a sapphire crystal core-borosilicate glass cladding hybrid fiber using a laser-heated pedestal growth technique. Considerable formation of F- and F(2)-type color emitters is effectively facilitated by Ti(4+) ions and Al(3+) vacancies, retaining efficient luminescence and high crystallinity of the sapphire core. These color centers intensify the ultraviolet, blue, and green emissions at 370, 450, and 540 nm, whereas the 650-nm red emission is contributed by Cr(3+) in the octahedral sites of the corundum structure. Over 1-mW white light with an optical-to-optical efficiency of up to nearly 5% and 1931 Commission International de l'Eclairage chromaticity coordinate of (0.287, 0.333) is achieved under 325-nm excitation.