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year 28, Issue 1 (1st Iranian Conference on optical fiber sensors (ICOFS 2021) 2021)
ICOP & ICPET _ INPC _ ICOFS 2021, 28(1): 16-18 |
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Bayat M, Rezvani Jalal M, Pishdast M, Abdikian A. Simulation of sound wave excitation by electrostriction mechanism in laser pulse transmission through an optical fiber. ICOP & ICPET _ INPC _ ICOFS 2021; 28 (1) :16-18
URL: http://opsi.ir/article-1-2496-en.html
URL: http://opsi.ir/article-1-2496-en.html
1- Department of Physics, Faculty of Science, Malayer University, Malayer, Iran
2- Plasma Physics and Fusion Research School, Nuclear Science and Technology Research Institute, Iran.
3- Department of Physics, Faculty of Science, Malayer University, Malayer, Iran.
2- Plasma Physics and Fusion Research School, Nuclear Science and Technology Research Institute, Iran.
3- Department of Physics, Faculty of Science, Malayer University, Malayer, Iran.
Abstract: (1032 Views)
In this paper, the generation of sound wave by electrostriction mechanism in injection of a laser pulse into the core of an optical fiber is simulated. The studies are accomplished by using of inhomogeneous hydrodynamic wave equation (with the divergence of volume electrostriction force as its source term). It is assumed that the initial perturbation of the fiber density is proportional to the electrostriction force. By solving the homogeneous wave equation, the acoustic eigen-frequencies of the optical fiber and the density eigen-functions are found. Then, the expansion theorem is used and propagation of the sound wave and its reflection from the fiber edge is simulated using a Mathematica code. Generation of sound echoes with temporal separation of 21 ns for a fiber made of fused silica of diameter 125 μm is completely evident.
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