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Transformation of Incoherent Phonon Flux into a Coherent Acoustical Signal as the Result of the Nonlinear Amplification of Acoustical Phonons in Semiconductors
Author(s) -
Gantsevich S. V.,
Gurevich V. L.,
Kagan V. D.,
Katilius R.
Publication year - 1976
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.2220750203
Subject(s) - physics , nonlinear system , phonon , noise (video) , beam (structure) , amplitude , signal (programming language) , attenuation , optics , condensed matter physics , quantum mechanics , artificial intelligence , computer science , image (mathematics) , programming language
A theory of nonlinear interaction of sound waves in a noise beam is developed. The case is considered where the intensity of the beam grows along a semiconducting crystal in a do electric field. It is demonstrated that if the nonlinear contribution to the amplification constant is negative the transformation of a noise beam into a coherent sound signal with fixed amplitude is possible during a single transit through the crystal. This occurs if the linear amplification constant has a sufficiently sharp maximum while the nonlinear attenuation constant is a smooth function of the wave vector.