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Piezo‐Optical Properties of Alkali Halides and Their Temperature Dependence
Author(s) -
Meseguer F.,
Sánchez C.
Publication year - 1978
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220890136
Subject(s) - birefringence , halide , atmospheric temperature range , attenuation coefficient , absorption edge , materials science , temperature coefficient , alkali metal , valence (chemistry) , ultraviolet , dichroic glass , optics , analytical chemistry (journal) , chemistry , thermodynamics , optoelectronics , band gap , composite material , physics , inorganic chemistry , organic chemistry , chromatography
The spectral dependence in the visible and vacuum ultraviolet of the piezo‐birefringence coefficients of NaF and KF is measured at room temperature. From these data the shear deformation potentials for the valence band are obtained. A piezo‐dichroic effect is also detected in the piezo‐optical experiments and the corresponding coefficients for KF are now reported. Finally the temperature dependence of the photoelastic coefficient Q 44 in KBr is measured between room temperature and 700 K. Q 44 remains practically constant in the visible range and shows a strong decrease on increasing temperature for photon energies close to the absorption edge. It can be concluded that there is no significant variation of the deformation potential in that temperature region.