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Buckingham, M.J. and Fairbank, W.M. (1961) The Nature of the λ-Transition. In: Gorter, C.J., Ed., Progress in low Temperature Physics, North-Holland, Amsterdam, 80.

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• TITLE: The Study of Optoacoustic First and Second Sound Waves in Superfluid Helium under the Effect of Gaussian Laser Light Considering Electrostriction Mechanism

  AUTHORS: Leyla Safaei Kouchaksaraei

  KEYWORDS: Electrostriction Mechanism, First and Second Sound Waves, Gaussian Laser Light, Superfluid Helium

  JOURNAL NAME: Journal of Modern Physics, Vol.6 No.7, June 11, 2015

  ABSTRACT: The present paper is aimed to study the effect of Gaussian laser light on first and second sound waves in superfluid helium theoretically using optoacoustic method. The mechanism applied in this study is electrostriction mechanism. This study considers crystal parts of superfluid helium with a zero absorption coefficient applying electrostriction mechanism. Affecting Gaussian laser light on these crystal parts, a spectrum of cylindrical first and second sound waves and cylindrical slow and rapid waves is obtained. Meanwhile, frequency of waves amplitudes proportionate to time period of laser light is calculated.