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편광홀로그램을 이용한 비정질 As2S3 박막에서의 광학적 화상처리
박창하(C . H . Park),김강호(K . H . Kim),강창호(C . H . Kang),김석원(S . W . Kim) 한국화상학회 2000 한국화상학회지 Vol.6 No.1
Diffraction gratings were fabricated by using photodarkening effect and diffraction efficiency were measured by Ar+. laser (λ=514.5nm) in amorphous As_2S_3 semiconductor thin films prepared by thermal evaporation method. To apply the polarization hologram which was recorded by two polarized laser beams to optical signal processing, the polarization holograms were recorded and reconstructed. For the case of hologram which recorded by two orthogonal linear polarizations, the diffraction efficiency was independent on the reading beam and the polarization state of diffracted beam was found to be a function of the reading beam. On the contrary, when two recording beams have reverse circular polarizations, the diffraction efficiency was strongly dependent on the polarization of the reading beam. Using this phenomena, the two images recorded on the same position were separately selected without changing the alignment of the optical system through the variation of the reading beam polarizations.