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25 April 2012 Micro- and nano-scale photonic lattices induced by Bessel beam technique in doped lithium niobate crystals
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In this report we present the results of optical induction of 1D and 2D micrometric and sub-micrometric scale annular symmetry photonic lattices in singly and doubly doped photorefractive lithium niobate crystals by Bessel beam technique. The non-diffracting Bessel beam was formed by axicon and the counter-propagating Bessel beam (CPBB) geometry was used to build-up the Bessel standing wave. The cw single mode 532 nm, 17 mW laser beam and 2mm thick lithium niobate (LN) crystals doped by Fe and doubly doped by Fe and Cu with 0,05 w% of impurity ions were used for lattices recording. The crystals with optical C-axes oriented along and perpendicular to the crystal surface (Y-cut and Z-cut LN crystals) were used for photonic lattices recording. The duration of recording was 60 min. 2D photonic lattices formed by CPBB method is a combination of annular and planar gratings and have the periods of 9.0 μm in radial and 266 nm in axial directions. The recorded lattices were tested by diffraction of probe laser beam at 633nm on the lattices. The direct observation of recorded lattices by phase microscope was also performed. The pronounced azimuthal dependence of recorded annular lattices was observed for Y-cut LN crystals. The photonic lattices recorded in LN:Fe:Cu crystals showed high stability against erasure during readout by weak probe beam at the recording wavelength. Under illumination by 2 mW probe green beam the total erasure of the photonic lattice occurred after 8000 sec, which was controlled by measuring the diffracted beam power during readout. The readout destruction of lattices recorded in LN:Fe crystal takes several minutes.
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Anahit Badalyan, Ruben Hovsepyan, Vahram Mekhitaryan, Paytsar Mantashyan, and Rafael Drampyan "Micro- and nano-scale photonic lattices induced by Bessel beam technique in doped lithium niobate crystals", Proc. SPIE 8425, Photonic Crystal Materials and Devices X, 84251J (25 April 2012);

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