Study about tunable phase modulation gratings by means of liquid Surface wave
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1.
School of Science, Xi'an Institute of Posts and Telecommunications, Xi'an 710121, China;
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2.
School of Electronic Engineering, Xi'an Institute of Posts and Telecommunications, Xi'an 710121, China;
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3.
Xi'an Aerotechnical College, Xi'an 710077, China
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Received Date:
2010-05-04
Accepted Date:
2010-07-06
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Abstract
In order to study the diffraction effect of the tunable phase modulation grating,steady and explicit diffraction patterns were obtained with the low-frequency generator driving the exciter to generate the low-frequency liquid surface wave (LFLSW).The distance between the diffraction patterns was variable with the frequency of the surface wave.Furthermore,the diffraction order might disappear at certain amplitude of the LFLSW.According to the physical optics theory,the periodical modulated LSW can be regarded as a phase modulated grating.The corresponding analytic expression of intensity distribution of diffraction patterns was derived,which explained the experimental phenomenon well.And the diffracted effect of the LSW was compared with that of the plane scotch grating.The results show that the LSW gives better diffracted effect.
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Proportional views
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