Premium
Generation of a Longitudinal Electric Field in CdS by Intense Laser Irradiation
Author(s) -
Vladimirov V. I.,
Pyshkin S. L.,
Ferdman N. A.
Publication year - 1970
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.19700390122
Subject(s) - electric field , condensed matter physics , phonon , physics , crystal (programming language) , intensity (physics) , electron , excitation , boltzmann equation , materials science , optics , quantum mechanics , computer science , programming language
The paper is concerned with the investigation of longitudinal electric fields (≈ 1 V/cm) arising in a homogeneous piezoelectric crystal at high level of optical excitation. The sign of the effect corresponds to the drag of free carriers (electrons in the case of CdS) in the direction of light propagation. The magnitude of the effect and its kinetics have been related to light intensity, temperature, crystal orientation, and the distance between the probe points. The effect is assumed to be a result of the generation of a phonon packet, referred to by the authors as acousto‐optical domain, and carrier drag by this domain. Calculations based on the Boltzmann equation for the electron distribution function give a reasonable phonon density inside the domain which is necessary for generating the electric field observed. The estimations based on the calculated phonon density show that considerable mechanical stresses exist in the domain area which can result in the destruction of the crystal when increasing the light intensity; so far the effect examined can be directly related to the problem of optical strength.