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Title: Polarisation-independent electrooptical switch based on LiNbO{sub 3} and LiTaO{sub 3} crystals

Abstract

Two electrooptical switches for nonpolarised narrow beams from fibre laser and luminescent sources are considered. Requirements for crystals, the accuracy of their thermal stabilisation, and tolerances for their manufacturing and adjustment are estimated from the point of view of the maximum switching contrast. A switch based on two LiNbO{sub 3} crystals with a control half-wave voltage of {approx}270 V, connected with an isotropic single-mode fibre, is tested. It is shown that errors in the adjustment and manufacturing of crystal phase elements can be compensated by a weak controllable heating of one of the crystals. (laser devices and elements)

Authors:
; ;  [1]
  1. Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Fryazino, Moscow Region (Russian Federation)
Publication Date:
OSTI Identifier:
21466670
Resource Type:
Journal Article
Resource Relation:
Journal Name: Quantum Electronics (Woodbury, N.Y.); Journal Volume: 37; Journal Issue: 5; Other Information: DOI: 10.1070/QE2007v037n05ABEH013426
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ACCURACY; CRYSTALS; ELECTRIC POTENTIAL; FIBERS; LASERS; LITHIUM COMPOUNDS; LUMINESCENCE; MANUFACTURING; NIOBATES; PHOTON BEAMS; POLARIZATION; SWITCHES; TOLERANCE; ALKALI METAL COMPOUNDS; BEAMS; ELECTRICAL EQUIPMENT; EMISSION; EQUIPMENT; NIOBIUM COMPOUNDS; OXYGEN COMPOUNDS; PHOTON EMISSION; REFRACTORY METAL COMPOUNDS; TRANSITION ELEMENT COMPOUNDS

Citation Formats

Davydov, B L, Krylov, Aleksandr A, and Yagodkin, D I. Polarisation-independent electrooptical switch based on LiNbO{sub 3} and LiTaO{sub 3} crystals. United States: N. p., 2007. Web. doi:10.1070/QE2007V037N05ABEH013426.
Davydov, B L, Krylov, Aleksandr A, & Yagodkin, D I. Polarisation-independent electrooptical switch based on LiNbO{sub 3} and LiTaO{sub 3} crystals. United States. doi:10.1070/QE2007V037N05ABEH013426.
Davydov, B L, Krylov, Aleksandr A, and Yagodkin, D I. Thu . "Polarisation-independent electrooptical switch based on LiNbO{sub 3} and LiTaO{sub 3} crystals". United States. doi:10.1070/QE2007V037N05ABEH013426.
@article{osti_21466670,
title = {Polarisation-independent electrooptical switch based on LiNbO{sub 3} and LiTaO{sub 3} crystals},
author = {Davydov, B L and Krylov, Aleksandr A and Yagodkin, D I},
abstractNote = {Two electrooptical switches for nonpolarised narrow beams from fibre laser and luminescent sources are considered. Requirements for crystals, the accuracy of their thermal stabilisation, and tolerances for their manufacturing and adjustment are estimated from the point of view of the maximum switching contrast. A switch based on two LiNbO{sub 3} crystals with a control half-wave voltage of {approx}270 V, connected with an isotropic single-mode fibre, is tested. It is shown that errors in the adjustment and manufacturing of crystal phase elements can be compensated by a weak controllable heating of one of the crystals. (laser devices and elements)},
doi = {10.1070/QE2007V037N05ABEH013426},
journal = {Quantum Electronics (Woodbury, N.Y.)},
number = 5,
volume = 37,
place = {United States},
year = {Thu May 31 00:00:00 EDT 2007},
month = {Thu May 31 00:00:00 EDT 2007}
}
  • Formation of solid solutions of lithium niobate and lithium tantalate with cadmium titanate was studied. (KBO/sub 2/)/sub 2/ was used as a solvent. Even small amounts of lithium niobate and tantalate have appreciable effects on the crystallization; on the other hand, KBO/sub 2/ -- CdTiO/sub 3/ melts give relatively large isometric cadmium titanate crystals (mainly in the perovskite modification), while the other components result in crystals mainly in the form of plates of ilmenite structure. Crystals of the ilmenite modification were shown by spectral analysis to contain considerable amounts of tantalum and niobium; powder patterns showed no additional lines, butmore » the interplanar distances were somewhat altered. Optical data indicated that the refractive indices were reduced appreciably when tantalum was present, and the proportion of the latter increased with the concentration in the initial melt. This indicates that solid solutions were formed.« less
  • No abstract prepared.
  • Piezoelectric force microscopy (PFM) and Raman confocal microscopy have been used for studying the nanodomain structures in congruent LiNbO{sub 3} and LiTaO{sub 3} crystals. The high-resolution nanodomain images at the surface were observed via PFM. Raman confocal microscopy has been used for the visualization of the nanodomain structures in the bulk via layer-by-layer scanning at various depths. It has been shown experimentally that the nanodomain images obtained at different depths correspond to domain images at the polar surface obtained at different moments: the deeper the nanodomain, the earlier the moment. Such a correlation was applied for the reconstruction of themore » evolution of the domain structures with charged domain walls. The studied domain structures were obtained in highly non-equilibrium switching conditions realized in LiNbO{sub 3} and LiTaO{sub 3} via pulse laser irradiation and the electric field poling of LiNbO{sub 3}, with the surface layer modified by ion implantation. The revealed main stages of the domain structure evolution allow the authors to demonstrate that all geometrically different nanodomain structures observed in LiNbO{sub 3} and LiTaO{sub 3} appeared as a result of discrete switching.« less
  • A crystal chemical study has been carried out for the ternary systems Li/sub 2/O-M/sub 2/O/sub 5/-(M'O/sub 2/)/sub 2/ (M = Nb, M' = Ti; M = Ta, M' = Sn), in order to characterize and delimit the extension of domains of solid solutions in the vicinity of LiNbO/sub 3/ and LiTaO/sub 3/. The nature of the nonstoichiometry within these regions of solid solution has been found to be of a cationic excess or deficit. No evidence for anionic deficit has been found in this study. The ferroelectric Curie temperature T/sub C/ decreases as the composition deviates from LiNbO/sub 3/ ormore » LiTaO/sub 3/. The decline in T/sub C/ has been interpreted on the basis of the electrostatic interactions resulting from either cationic excess or deficit.« less
  • The synthesis of HNbO/sub 3/ and HTaO/sub 3/ from LiNbO/sub 3/ via ion exchange in hot aqueous acid solutions is reported. This reaction is accompanied by a topotactic structural transformation from the rhombohedral LiNbO/sub 3/ structure to the cubic perovskite structure; cell constants are a = 3.822(1) angstrom for HNbO/sub 3/ and 3.810(2) angstrom for HTaO/sub 3/. These new compounds have been characterized by powder X-ray diffraction, thermogravimetric analysis, and solid-state NMR. They are electronic insulators and have low ionic conductivity. Evidence of partially proton-exchange phases Li/sub 1-x/H/sub x/MO/sub 3/ was also seen. The possible significance of this ion exchangemore » reaction for devices using LiNbO/sub 3/ or LiTaO/sub 3/ is discussed.« less