Diffraction efficiency analysis of reflective holographic phase gratings in paraelectric KTN crystal
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1.
College of Opto-Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China;
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2.
College of Computer, National University of Defense Technology, Changsha 410073, China
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Corresponding author:
JI Jia-rong, jijiarong@hotmail.Com
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Received Date:
2010-01-22
Accepted Date:
2010-03-09
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Abstract
The holographic grating storage in photorefractive crystal in paraelectric phase is an available approach to develop a new style electroholography switch.In order to improve the diffraction efficiency,the analytic expression was deduced combining Kogelnik coupling wave theory with the Kukhtarev equations.Then the parameters affecting the diffraction efficiency were analyzed.It's found that the diffraction efficiency can be increased by the methods such as aparting the incident angle far from 45°,increasing the crystal thickness and electric field.A low diffraction efficiency district exists at incident angles in vicinity of 45°.Diffraction efficiency is sensitive to incident angles,crystal thickness and applied electric field.A small change of these factors may bring a great difference of the diffraction efficiency.The influence of absorption of crystal on reading diffraction efficiency is negligible.The results provide useful guidelines to choose optimal parameters for high reading diffraction efficiency in practice.
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