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- W2030293432 abstract "Abstract We investigated the acoustic-energy density of electro-acoustically amplified transverse off-axis waves in single crystals of semiconducting CdS in the frequency range 0.25–1.8 GHz with the help of a Brillouin-scattering technique. The electric field was applied parallel to the c-axis in pulses of 40 μs duration with a rise-time of about 5 μs. The repetition rate was 4 Hz. The excited acoustic flux appeared to be stationary about 5 μs after the onset of the bias pulse. All measurements were carried out at room temperature. The conductivities of the various samples ranged from 0.66Ω-1m-1 to 2.3Ω-1m-1. The spectral acoustic-energy distribution appeared to peak at a frequency considerably lower than that predicted by White's linear small-signal gain theory. With increasing voltage this peak was found to shift towards lower frequencies, which could be as much as 4 times lower than predicted by White's theory. This down-shift with increasing voltage was discussed in terms of an adapted linear theory: we took into account acoustic-scattering losses at the crystal side-faces and a decrease of the conductivity. The latter effect is thought to be caused by the trapping of free charge carriers in deep potential troughs which are associated with the amplified acoustic waves. We found that the down-shift of the peak frequency with increasing voltage can be described quite well by this adapted linear theory. The off-axis angle of maximum acoustic-energy density as obtained from Brillouin-scattering appeared to be in good agreement with the off-axis angle as calculated from resonances in the ac impedence." @default.
- W2030293432 created "2016-06-24" @default.
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- W2030293432 date "1982-05-01" @default.
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- W2030293432 title "Brillouin-scattering study of the stationary, electro-acoustically amplified acoustic flux in CdS" @default.
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- W2030293432 doi "https://doi.org/10.1016/0378-4363(82)90078-x" @default.
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