Browsing by Author "Zaitsev, AK"

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Anisotropic diffraction of light by volume holographic grating in birefringent photorefractive crystals with extended wavelength range
(2002-02-25)
Zaitsev, AK
;
Hsu, KY
;
Lin, SH
;
交大名義發表
;
National Chiao Tung University
The properties of anisotropic diffraction of light by volume holographic grating in birefringent photorefractive crystals are discussed. This diffraction takes place when the refractive index for diffracted light is different from the refractive index for incident light. It is found that in some special geometry of wavevector diagram the diffraction becomes less sensitive to the wavelength mismatch of Bragg condition. The wavelength range may extent in several times the range of ordinary isotropic diffraction on the grating of the same spacing and thickness. Theoretical explanation of this phenomena and experimental results of widerange diffraction in BaTiO3 photorefractive crystal are also presented. (C) 2002 Optical Society of America.
Creation of weighted volume grating by holographic method
(2001)
Zaitsev, AK
;
Lin, SH
;
Hsu, KY
;
交大名義發表
;
National Chiao Tung University
The creation method of a weighted holographic grating in photopolymer film is discussed, It is based on interference of two beams passed through weighting masks. Due to weighing the grating's response has sidelobe level to be reduced.
Subcollinear acousto-optic tunable filter based on the medium with a strong acoustic anisotropy
(2003-04-15)
Zaitsev, AK
;
Kludzin, VV
;
光電工程學系
;
Department of Photonics
We design and investigate the properties of acousto-optical tunable filter (AOTF) based on tellurium dioxide (TeO2) single crystal. We use so-called "subcollinear" geometry of anisotropic acousto-optic interaction that occurs when the wavevector of incident light is collinear to acoustic energy vector. We have obtained the analytical formula of spectrum spread function of proposed AOTF and have found the condition determining the shape of that characteristic. Also we have designed and fabricated the experimental prototype of subcollinear AOTF. In our design we have used the reflection of acoustic wave that allowed to use crystal's media more effectively and reduce the AOTF size. The main advantage of filter based on proposed geometry is extremely low value of electrical driving power (20 mW) that makes it a strong candidate in many applications. (C) 2003 Elsevier Science B.V. All rights reserved.