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Title: 1.319 μm excited intense 800 nm frequency upconversion emission in Tm{sup 3+}-doped fluorogermanate glass

Generation of near-infrared light within the first biological optical window via frequency upconversion in Tm{sup 3+}-doped PbGeO{sub 3}-PbF{sub 2}-CdF{sub 2} glass excited within the second biological window at 1.319 μm is reported. The upconversion emission at 800 nm is the sole light signal observed in the entire ultraviolet-visible-near-infrared spectral region making it possible obtaining high contrast imaging. The dependence of the 800 nm signal upon the sample temperature was investigated and results showed an increase by a factor of ×2.5 in the 30–280 °C range. Generation of detectable 690 nm for temperatures above 100 °C in addition to the intense 800 nm main signal was also observed. The proposed excitation mechanism for the 800 nm thulium emitting level is assigned to a multiphonon-assisted excitation from the ground-state {sup 3}H{sub 6} to the {sup 3}H{sub 5} excited-state level, a rapid relaxation to the {sup 3}F{sub 4} level and followed by an excited-state absorption of the pump photons mediated by multiphonons connecting the {sup 3}F{sub 4} level to the {sup 3}H{sub 4} emitting level.
Authors:
; ; ;  [1] ;  [2]
  1. Grupo de Fotônica e Fluidos Complexos, Instituto de Física, Universidade Federal de Alagoas, 57072-900 Maceió-AL (Brazil)
  2. Universidade de Sorocaba, 18023-000 Sorocaba-SP (Brazil)
Publication Date:
OSTI Identifier:
22486112
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 21; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABSORPTION; DOPED MATERIALS; EMISSION; EXCITATION; EXCITED STATES; GROUND STATES; LEAD FLUORIDES; PHOTONS; RELAXATION; SIGNALS; TEMPERATURE RANGE 0273-0400 K; TEMPERATURE RANGE 0400-1000 K; THULIUM; THULIUM IONS; ULTRAVIOLET RADIATION