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Title: Microstructure and defects probed by Raman spectroscopy in lithium niobate crystals and devices

Raman microprobe applied on LiNbO{sub 3} (LN) crystals and derived materials or devices is shown to be a tool to detect either local variations or changes of the whole structure. Position, width, or intensity of one Raman line can be used as markers of a structural change. Indeed, each Raman line can be assigned to a peculiar ionic motion and is differently sensitive to application of strain, temperature change, and electric field. Some vibrational modes are especially associated to the site of Li ion, or Nb ion, or still oxygen octahedron, so that they can be affected by the introduction of dopant ion on one or another site. Therefore, Raman Spectroscopy (RS) can be used as a site spectroscopy to describe the mechanism of doping incorporation in the LN lattice, allowing the optimization of some linear and non-linear optical properties according to the dopant concentration and substitution site. The composition or the content of non-stoichiometry related defects could be derived from the width of some lines. Any damage or local disorder can be detected by a line broadening. The quality or preservation of the structure after chemical treatment, or laser pulses, can be thus checked. The structure of ion-implanted ormore » proton-exchanged wave-guides and periodically poled lithium niobate as well can be imaged from frequency shift or intensity change of some lines. RS is thus a useful way to control the structure of LN and/or to optimize the preparation parameters and its properties.« less
Authors:
;  [1]
  1. Laboratoire Matériaux Optiques, Photonique et Systèmes, LMOPS, Université de Lorraine and CentraleSupelec, 2 rue E. Belin, 57070 Metz (France)
Publication Date:
OSTI Identifier:
22482271
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Reviews; Journal Volume: 2; Journal Issue: 4; 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; CONTROL; CRYSTAL DEFECTS; CRYSTALS; ELECTRIC FIELDS; LINE BROADENING; LITHIUM; LITHIUM COMPOUNDS; LITHIUM IONS; MICROSTRUCTURE; NIOBATES; NIOBIUM IONS; NIOBIUM OXIDES; NONLINEAR OPTICS; PERIODICITY; PRESERVATION; RAMAN SPECTROSCOPY; STOICHIOMETRY