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Title: Particle detection through the quantum counter concept in YAG:Er{sup 3+}

We report on a scheme for particle detection based on the infrared quantum counter concept. Its operation consists of a two-step excitation process of a four level system, which can be realized in rare earth-doped crystals when a cw pump laser is tuned to the transition from the second to the fourth level. The incident particle raises the atoms of the active material into a low lying, metastable energy state, triggering the absorption of the pump laser to a higher level. Following a rapid non-radiative decay to a fluorescent level, an optical signal is observed with a conventional detector. In order to demonstrate the feasibility of such a scheme, we have investigated the emission from the fluorescent level {sup 4}S{sub 3∕2} (540 nm band) in an Er{sup 3+}-doped YAG crystal pumped by a tunable titanium sapphire laser when it is irradiated with 60 keV electrons delivered by an electron gun. We have obtained a clear signature that this excitation increases the {sup 4}I{sub 13∕2} metastable level population that can efficiently be exploited to generate a detectable optical signal.
Authors:
 [1] ; ; ; ;  [2] ; ;  [3] ;  [4]
  1. CNISM Unit, Dip. di Fisica e Astronomia and INFN, Via F. Marzolo 8, I-35131 Padova (Italy)
  2. Dip. di Fisica e Astronomia and INFN, Via F. Marzolo 8, I-35131 Padova (Italy)
  3. Dip. di Fisica and INFN, Largo Bruno Pontecorvo, 3, I-56127 Pisa (Italy)
  4. INFN, Laboratori Nazionali di Legnaro, Viale dell'Università 2, I-35020 Legnaro (Italy)
Publication Date:
OSTI Identifier:
22486064
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 19; 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; DETECTION; DOPED MATERIALS; ELECTRON GUNS; ERBIUM IONS; EXCITATION; FLUORESCENCE; NEODYMIUM LASERS; RADIATIVE DECAY; RARE EARTHS; SAPPHIRE; SIGNALS; TITANIUM