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Title: Superbroadband near-infrared emission and energy transfer in Pr³⁺-Er³⁺ codoped fluorotellurite glasses
Authors: Zhou, B
Tao, L
Tsang, YH 
Jin, W 
Pun, EYB
Issue Date: 21-May-2012
Source: Optics express, 21 May 2012, v. 20, no. 11, p. 12205-12211
Abstract: We report the first demonstration of superbroadband emission extending from 1.30 to 1.68 μm in praseodymium(Pr³⁺)-erbium(Er³⁺) codoped fluorotellurite glasses under 488 nm excitation. This superbroad near-infrared emission is contributed by the Pr³⁺: ¹D₂→ ¹G₄ and Er³⁺: ⁴I ₁₃ ̷ ₂→ ⁴I ₁₅ ̷ ₂ transitions which lead to emissions located at 1.48 and 1.53 μm, respectively. The quenching of the Pr³⁺ emission resulted from the cross relaxation [ ¹D₂, ³H₄]→[ ¹G₄, ³F₃,₄] was effectively compensated by the codoping of Er³⁺. The results suggest that, other than the heavy-metal and transition-metal elements of active bismuth (Bi), nickel (Ni), chromium (Cr), etc., Pr³⁺-Er³⁺ codoped system is a promising alternative for the broadband near-infrared emission covering the expanded low-loss window.
Keywords: Bismuth
Chromium
Energy transfer
Glass
Infrared devices
Praseodymium
Transition metals
Publisher: Optical Society of America
Journal: Optics express 
EISSN: 1094-4087
DOI: 10.1364/OE.20.012205
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-20-11-12205. 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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