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Fluctuations of optical phase of diffracted light for Raman-Nath diffraction in acousto-optic effect |
Weng Cun-Cheng (翁存程)a b, Zhang Xiao-Man (章小曼)b c |
a College of Physics and Energy, Fujian Normal University, Fujian 350007, China; b Key Laboratory of Opto-Electronic Science and Technology for Medicine of Ministry of Education, Fujian 350007, China; c College of Photonic and Electronic Engineering, Fujian Normal University, Fujian 350007, China |
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Abstract The Raman-Nath diffraction in acousto-optic effect was studied theoretically and experimentally in the paper. Up to now, each order of diffracted light in Raman-Nath diffraction was still considered simply to be just frequency-shifted and to be a plane wave. However, we find that the phase and frequency shifts occur simultaneously and individually in Raman-Nath diffraction. The findings demonstrate that, in addition to the frequency shift, the optical phase of each order of diffracted light is also shifted by the sound wave and fluctuates with the sound wave and is related to the location in the acoustic field from which the diffracted light originates. As a result, the wavefront of each order of diffracted light is modulated to fluctuate spatially and temporally with the sound wave. Obviously, these findings are significant for applications of Raman-Nath diffraction in acousto-optic effect because the optical phase plays an important role in optical coherence technology.
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Received: 07 May 2014
Revised: 12 September 2014
Accepted manuscript online:
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PACS:
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42.65.-k
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(Nonlinear optics)
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43.35.+d
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(Ultrasonics, quantum acoustics, and physical effects of sound)
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42.25.Fx
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(Diffraction and scattering)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61178089) and the Science and Technology Program of the Educational Office of Fujian Province of China (Grant Nos. JB12012 and JB13003). |
Corresponding Authors:
Zhang Xiao-Man
E-mail: xmzhang@fjnu.edu.cn
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Cite this article:
Weng Cun-Cheng (翁存程), Zhang Xiao-Man (章小曼) Fluctuations of optical phase of diffracted light for Raman-Nath diffraction in acousto-optic effect 2015 Chin. Phys. B 24 014210
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