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

• 作者: Leyla Safaei Kouchaksaraei
• 来源期刊: 现代物理(英文)
• 学科: 医学
• 关键词: ELECTROSTRICTION MECHANISM FIRST and SECOND Sound Waves GAUSSIAN LASER Light Superfluid Helium
• 年，卷（期）: 2015,（7）
• 页码范围: 855-862
• 页数: 8页
• 分类号: R73

摘要

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.