NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2014, 5 (2), P. 210–216
OPTICAL INDUCTION OF 3D REFRACTIVE LATTICES IN DOUBLY DOPED LiNbO3 PHOTOREFRACTIVE CRYSTAL
A. Badalyan – Institute for Physical Research, National Academy of Sciences of Armenia, 0203, Ashtarak-2, Armenia
P. Mantashyan – Institute for Physical Research, National Academy of Sciences of Armenia, 0203, Ashtarak-2, Armenia
V. Mekhitaryan – Institute for Physical Research, National Academy of Sciences of Armenia, 0203, Ashtarak-2, Armenia
V. Nersesyan – Institute for Physical Research, National Academy of Sciences of Armenia, 0203, Ashtarak-2, Armenia; vars.nersesyan@gmail.com
R. Drampyan – Institute for Physical Research, National Academy of Sciences of Armenia, 0203, Ashtarak-2; Armenian – Russian (Slavonic) University, H. Emin str. 123, 0051, Yerevan, Armenia
The optical induction of 3D rotational symmetry refractive lattices in doubly doped photorefractive and photochromic LiNbO3:Fe:Cu crystal by combined interferometric-mask method was performed. The method is based on the spatial light modulation by amplitude mask in the transverse plane and the use of counter-propagating beam geometry building up a Gaussian standing wave, which defines the light intensity modulation in the axial direction with half-wavelength periodicity. Masks with rotationally symmetrical structures are used in the experiment. The created intensity pattern was imparted into the LiNbO3:Fe:Cu crystal thus creating refractive lattice with the periods of 20 – 60 µm in the radial and azimuthal directions and 266 nm in the axial direction. The refractive and dispersive properties of the recorded lattices were studied.
Keywords: Photonic lattice, photorefractive and photochromic effects, lithium niobate, micro- and nano-structures.
PACS 42.70.Qs, 78.67.Pt
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