25 March 1999 Dynamic holographic beamsplitters: feasibility investigation
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Results of the development of holographic beamsplitters are reported. Binary and multilevel samples for 630-nm and 530-nm laser light have efficiency of over 70% (over 80% for multilevel ones) and output beam intensity variations of less than 5%. The effect of various errors has been simulated for the process of fabrication of multilevel structures. The use of three-level phase structures for realizing asymmetric output beam pattern is investigated. The possibility to employ 2D acousto-optical structures for making dynamic phase elements (real-time HOEs) is investigated. The output diffraction pattern of an element generated by two perpendicular acoustic waves is computed and the possibility to split the input laser beam is demonstrated. The results of testing an experimental real-time beamsplitter are given and show good agreement with computations. The sample is a LiNbO3 crystal between the parallel faces of which the acoustic pulse undergoes multiple reflections. The output beam patterns for a combination of a passive and dynamic HOEs are also presented.
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Andrei L. Mikaelian, Andrei L. Mikaelian, Aleksandr N. Palagushkin, Aleksandr N. Palagushkin, Sergei A. Prokopenko, Sergei A. Prokopenko, } "Dynamic holographic beamsplitters: feasibility investigation", Proc. SPIE 3637, Practical Holography XIII, (25 March 1999); doi: 10.1117/12.343766; https://doi.org/10.1117/12.343766

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