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Title: Superbroadband near-IR photoluminescence from Pr³⁺-doped fluorotellurite glasses
Authors: Zhou, B
Tao, L
Tsang, YH 
Jin, W 
Pun, EYB
Issue Date: 13-Feb-2012
Source: Optics express, 13 Feb. 2012, v. 20, no. 4, p. 3803-3813
Abstract: Praseodymium(Pr³⁺)-doped fluorotellurite glasses were synthesized and broadband photoluminescence (PL) covering a wavelength range from 1.30 to 1.67 μm was observed under both 488 and 590 nm wavelength excitations. The broadband PL emission is mainly due to the radiative transition from the manifolds Pr³⁺: ¹D₂to ¹G₄. The PL line-shape, band width, and lifetime were modified by the Pr³⁺ dopant concentration, and a quantum efficiency as high as 73.7% was achieved with Pr³⁺ dopant in a low concentration of 0.05 mol%. The good spectroscopic properties were also predicted by the Judd-Ofelt analysis, which indicates a stronger asymmetry and covalent bonding between the Pr³⁺ sites and the matrix lifgand field. The large stimulated emission cross-section, long measured lifetime, and broad emission bandwidth confirm the potential of the Pr³⁺- singly doped fluorotellurite glass as broadband luminescence sources for the broadband near-infrared optical amplifications and tunable lasers.
Keywords: Doping (additives)
Glass
Lasers
Photoluminscence
Praseodymium
Spectroscopic analysis
Publisher: Optical Society of America
Journal: Optics express 
EISSN: 1094-4087
DOI: 10.1364/OE.20.003803
Rights: © 2012 Optical Society of America. This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/abstract.cfm?URI=oe-20-4-3803. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
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