Acoustic wave calibration for CO2laser scattering experiments
作者:
J. F. Valley,
R. E. Slusher,
期刊:
Review of Scientific Instruments
(AIP Available online 1983)
卷期:
Volume 54,
issue 9
页码: 1157-1162
ISSN:0034-6748
年代: 1983
DOI:10.1063/1.1137541
出版商: AIP
数据来源: AIP
摘要:
An acoustic wave technique is described which provides an absolute calibration of the amplitude of the light scattered from a CO2laser beam at near‐forward angles by fluctuations in plasmas or other media. This technique also provides a direct measure of the wavelengths of fluctuations that can be resolved by CO2laser light scattering. Using simple vibrating membranes, acoustic waves with wavelengths from a few millimeters to several centimeters can be generated with accurately measured amplitudes. Laser scattering from these waves verifies that wavelengths as long as 2 cm can be resolved with small‐angle CO2laser scattering. For the case of heterodyne detection, calibration of the scattered wave amplitudes is obtained to within ± 20%.
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