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Generation of Picosecond Acoustic Pulses by Laser Radiation in Piezosemiconductors
Author(s) -
Gusev V. E.
Publication year - 1990
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.2221580137
Subject(s) - picosecond , thermoelastic damping , excited state , excitation , laser , pulse (music) , electron , photoacoustic effect , materials science , optics , radiation , atomic physics , physics , thermal , quantum mechanics , detector , meteorology
Theoretical description is proposed of the frequency spectrum of strain pulses, excited by optical generation of nonequilibrium charge carriers in piezocrystals. The acoustic pulses are excited by the inverse piezoeffect by electric fields induced by spatial separation of electrons and holes. The conditions necessary for picosecond strain pulse generation are determined. The possibility of acoustic pulse excitation with duration governed by Debye screening time is predicted. It is shown that piezomechanism of optoacoustic transformation may be more effective than thermoelastic and electronic mechanisms.