Photo- and neutronrefractive materials and effects  Page description

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Details of project

  
Identifier
47265
Type K
Principal investigator Kovács, László
Title in Hungarian Foto- és neutronrefraktív anyagok és jelenségek
Title in English Photo- and neutronrefractive materials and effects
Panel Physics 1
Department or equivalent Crystal Physics Dept. (Research Institute for Solid State Physics and Optics Hung. Acad. Sci.)
Participants Bányász, István
Corradi, Gábor
Lengyel, Krisztián
Malicskó, László
Mandula, Gábor
Watterich, Andrea
Starting date 2004-01-01
Closing date 2008-12-31
Funding (in million HUF) 15.334
FTE (full time equivalent) 0.00
state closed project





 

Final report

  
Results in Hungarian
A fotorefraktív kristályokban fény hatására kialakuló holografikus rácsok időbeli változásának vizsgálatára több módszert is kidolgoztunk, melyek fáziskontraszt és interferencia mikroszkópián, digitális holografikus interferencián, illetve egy négyhullámkeveréses topografikus elrendezésen alapulnak. Kimutattuk, hogy a fotorefraktív LiNbO3 kristályba írt rács diffrakciós hatásfoka termikus neutron-besugárzás hatására lecsökken, lehetőséget nyújtva neutron dozimetriai alkalmazásra. Spektroszkópiai méréseken alapuló módszereket dolgoztunk ki a LiNbO3 összetételének, sugárzással vagy termokémiai redukcióval létrehozott hibaszerkezetének és a fotorefraktív viselkedést befolyásoló adalékok és szennyezők koncentrációjának kristálybeli meghatározására. Röntgendiffrakciós, dielektromos, elektronmikroszkópos és optikai spektroszkópiai módszerekkel meghatároztuk számos lézer- és magneto-optikai alkalmazással rendelkező kristály összetétel- és adalékfüggő hibaszerkezetét, valamint periodikusan polarizált domén szerkezeteket, sík- és csatorna hullámvezetőket állítottunk elő és tanulmányoztunk mikroszkópos, Raman szórási és felületi profilometriai módszerekkel.
Results in English
Several methods based on phase-contrast and interference microscopy, digital holographic interferometry, and a four-wave-mixing topographic setup have been elaborated for the investigation of the real-time development of light-induced holographic gratings in photorefractive crystals. It has been shown that the diffraction efficiency of the grating recorded in the photorefractive LiNbO3 crystal decreases under thermal neutron radiation which may be useful for neutron dosimetric application. Methods based on spectroscopic measurements have been elaborated to determine the composition, the defect structure induced by radiation or thermochemical treatment, and the concentration of dopants and impurities effecting the photorefractive behavior in LiNbO3 crystals. X-ray diffraction, dielectric, electron microscopic and optical spectroscopic methods have been used to determine the composition and dopant-dependent defect structure of several laser and magneto-optical crystals. Periodically polarized domain structures as well as planar and channel waveguides have been fabricated and investigated by optical microscopes, Raman scattering and surface profilometry.
Full text https://www.otka-palyazat.hu/download.php?type=zarobeszamolo&projektid=47265
Decision
Yes





 

List of publications

  
Bányász I; Mandula G: Direct microscopic observation of hologram build-up in photorefractive crystals, Proceedings of SPIE 6252: 625209/1-6, 2006
Bányász I; Mandula G: Quasi in-situ microscopic study of hologram build-up in LiNbO3 crystals, Proc. SPIE 6488: 648808/1-10, 2007
Bányász I; Mandula G: Application of interference microscopy to the study of hologram build-up in LiNbO3 crystals, Optics Communications 281: 4268-4272, 2008
Bányász I, Kornis J: High-resolution lensless Fourier-transform digital holography, Proceedings of SPIE 5856: 71-79, 2005
Bugaychuk S; Mandula G; Kovács L; Rupp RA: Optical topographic technique to material characterization of photorefractive crystals, Proceedings of SPIE 6023: 60230J/1-11, 2005
Mandula G: A hullámkeverés térbeli és időbeli vizsgálatának új módszerei és alkalmazásai fotorefraktív kristályokban, BME, PhD értekezés, 2005
Bányász I: Refractive index modulation vs. before-bleach optical density modulation characteristics of silver halide phase holograms, Optics Communications 244: 79-91, 2005
Bányász I: Fourier analysis of high spatial frequency holographic phase gratings, Journal of Modern Optics 52: 2443-2451, 2005
Bányász I: Higher-order harmonics in bleached silver halide holograms, Optics and Lasers in Engineering 44: 926-942, 2006, 2006
Bányász I: Comparison of the effects of two bleaching agents on the recording of phase holograms in silver halide emulsions, Optics Communications 267: 356-361, 2006
Righini GC; Bányász I; Berneschi S; Brenci M; Chiasera A; Cremona M; Erht D; Ferrari M; Montereali RM; Nunzi Conti G; Pelli S; Sebastiani S; Tosello C: Laser irradiation, ion implantation and e-beam writing of integrated optical structures, Proceedings of SPIE 5840: 649-657, 2005
Berneschi S; Brenci M; Nunzi Conti G; Pelli S; Righini GC; Bányász I; Watterich A; Khanh NQ; Fried M; Pászti F: Channel waveguides fabrication in Er3+-doped tellurite glass by ion beam irradiation, Proc. SPIE 6475: 647509/1-6, 2007
Berneschi S; Nunzi Conti G; Bányász I; Watterich A; Khanh NQ; Fried M; Pászti F; Brenci M; Pelli S; Righini GC: Ion beam irradiated channel waveguides in Er3+-doped tellurite glass, Appl. Phys. Lett. 90: 121136/1-3, 2007
Bányász I; Berneschi S; Fried M; Cacciari I; Lohner T; Nunzi-Conti G; Pászti F; Pelli S; Righini GC; Watterich A; Zolnai Z; Petrik P: Nitrogen-ion-implanted planar optical waveguides in Er-doped tellurite glass: fabrication and characterisation, Proc. SPIE 6890: 68901A/1-9, 2008
Mandula G; Rupp RA; Balaskó M; Kovács L: Decay of photorefractive gratings in LiNbO3:Fe by neutron irradiation, Applied Physics Letters 86: 141107/1-3, 2005
Mandula G; Rupp RA; Balaskó M: Erasure of elementary holograms in LiNbO3:Fe by neutron irradiation, Proceedings of SPIE 6252: 62520N/1-5, 2006
Lengyel K; Péter Á; Polgár K; Kovács L; Corradi G: UV and IR absorption studies in LiNbO3:Mg crystals below and above the photorefractive threshold, Physica Status Solidi (c) 2: 171-174, 2005
Péter Á; Polgár K; Kovács L; Lengyel K: Threshold concentration of MgO in near-stoichiometric LiNbO3 crystals, Journal of Crystal Growth 284: 149-155, 2005
Lengyel K: OH rezgések abszorpciójának vizsgálata oxidkristályokban, SZTE, PhD értekezés, 2005
Lengyel K, Kovács L, Péter Á, Polgár K, Corradi G, Bourson P: The effect of Mg doping on the Raman spectra of LiNbO3 crystals, Phys. Stat. Sol. (c) 4: 847-850, 2007
Lengyel K, Kovács L, Péter Á, Polgár K, Corradi G: The effect of stoichiometry and Mg doping on the Raman spectra of LiNbO3:Mg crystals, Appl. Phys B 87: 317-322, 2007
Lengyel K; Kovács L; Péter Á; Polgár K; Corradi G; Baraldi A: Temperature dependence of the OH absorption bands in LiNbO3:Mg crystals at the photorefractive threshold, Technical Digest of the International Workshop Lithium Niobate from material to device, from device to system, Metz, France, pp. 153-154, 2005
Corradi G; Meyer M; Polgár K: Bipolarons localized by Ti dopants in reduced LiNbO3 crystals double-doped by Ti and Mg, Physica Status Solidi (c) 2: 132-135, 2005
Corradi G; Meyer M; Polgár K: Spectroscopy of shallow levels in LiNbO3 systems, Technical Digest of the International Workshop Lithium Niobate from material to device, from device to system, Metz, France, pp.117-118, 2005
Conradi D; Merschjann C; Schoke B; Imlau M; Corradi G; Polgár K: Influence of Mg doping on the behaviour of polaronic light-induced absorption in LiNbO3, Physica Status Solidi (RRL) 2: 284-286, 2008
Merschjann C; Schoke B; Conradi D; Imlau M; Corradi G; Polgár K: Absorption cross sections and number densities of electron and hole polarons in congruently melting LiNbO3, J. Phys.: Condens Matter 21: 015906/1-6, 2009
Schoke B; Brüning H; Schirmer O F; Imlau M; Corradi G; Polgár K; Naumova I: Transport and recombination behavior of optically generated small polarons with a spatial density modulation in LiNbO3, Proceedings of Photorefractive Materials, Effects and Devices, Bad Honnef, Germany, pp108-109, 2009
Mandula G; Ellabban MA; Fally M: A method to determine H+ concentration in dehydrated iron doped lithium niobate using photorefractive beam fanning effect, Ferroelectrics 352:118-124, 2007
Lengyel K, Szaller Zs, Péter Á, Polgár K, Kovács L: Microscopic and Raman spectroscopic investigation of the domain structures in LiNbO3:Y:Mg crystals, Ferroelectrics 368: 3-11, 2008
Jackson RA; Lengyel K; Kovács L; Valerio MEG: Computer modelling of the structure, properties and intrinsic defects in LiNbO3, Technical Digest of the International Workshop Lithium Niobate from material to device, from device to system, Metz, France, pp. 97-98, 2005
Araujo RM, Lengyel K, Jackson RA, Kovács L, Valerio MEG: A computational study of intrinsic and extrinsic defects in LiNbO3, J. Phys.: Condens. Matter 19: 046211/1-10, 2007
Araujo RM, Lengyel K, Jackson RA, Valerio MEG, Kovács L,: Computer modelling of intrinsic and substitutional defects in LiNbO3, Phys. Stat. Sol. (c) 4: 1201-1204, 2007
Dravecz G; Péter Á; Polgár K; Kovács L: Alkali metal oxide solvents in the growth stoichiometric LiNbO3 crystals, Journal of Crystal Growth 286: 334-337, 2006
Dravecz G; Kovács L; Péter Á; Polgár K; Bourson P: Raman and infrared spectroscopic characterization of LiNbO3 crystals grown from alkali metal oxide solvents, Phys. Stat. Sol. (c) 4: 1313-1316, 2007
Dravecz G; Kovács L: Determination of the crystal composition from the OH- vibrational spectrum in lithium niobate, Appl. Phys. B 88: 305-307, 2007
Hajdara I; Lengyel K; Dravecz G; Kovács L; Péter Á; Szaller Zs: Spectroscopic methods for the determination of the composition of potassium lithium niobate crystals, Phys. Stat. Sol. (c) 4: 1321-1324, 2007
Péter Á, Hajdara I, Lengyel K, Dravecz G, Kovács L, Tóth M: Characterization of potassium lithium niobate (KLN) ceramic system, J. Alloys Compd. 463: 398-402, 2008
Hajdara I, Lengyel K, Kovács L, Péter Á, Dravecz G, Szaller Zs: Compositional dependence and structure of hydroxyl defects in ferroelectric potassium lithium niobate, Ferroelectrics 369: 98-107, 2008
Dachraoui H; Rupp RA; Lengyel K, Ellabban MA, Fally M, Corradi G, Kovács L, Ackermann L: Photochromism of doped terbium gallium garnet, Physical Review B 74: 144104/1-11, 2006
Gruber JB; Sardar DK; Yow RM; Valiev UV; Mukhammadiev AK; Sokolov VY; Amin I; Lengyel K; Kachur IS; Piryatinskaya VG; Zandi B: Analyses of the optical and magneto-optical spectra of Tb3Ga5O12, J. Appl. Phys. 101: 023108/1-14, 2007
Malicskó L; Pogány L; Tóth A L; Horváth V; Beregi E: Microscopic studies on imperfections in selected YAB single crystals, Cryst. Res. Technol. 44: 425-432, 2009
Kovács L; Borowiec MT; Majchrowski A; Baraldi A; Capelletti R: FTIR absorption study of hydroxyl ions in KHo(WO4)2 single crystals, Cryst. Res. Technol. 40: 444-448, 2005
Kovács L; Péter Á; Gospodinov M; Capelletti R: Hydroxyl ions in acousto-optic Pb5(GeO4)(VO4)2 and Bi2(MoO4)3 single crystals, Physica Status Solidi (c) 2: 689-692, 2005
Kovács L; Péter Á; Ivleva LI; Baraldi A; Capelletti R: Hydroxyl ions in scheelite type molybdates and tungstates, Phys. Stat. Sol. (c) 4: 856-859, 2007



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