Dr. Andris Ozols Profile

Dr. Andris Ozols

Leading researcher at Riga Technical Univ

SPIE Involvement:

Author

Proceedings Article | 22 October 2014 Paper

Recording and self-enhancement of dynamic polarization gratings in degenerate four-wave-mixing geometry

A. Ozols, A. Belyaev, V. Kokars, P. Augustovs, K. Traskovskis, D. Saharov

Proceedings Volume 9421, 942108 (2014) https://doi.org/10.1117/12.2084046

KEYWORDS: Polarization, Holography, Photodetectors, Chalcogenides, Holograms, Two wave mixing, Reflection, Image transmission, Mirrors, Glasses

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Proceedings Article | 6 March 2013 Paper

Thermal, glass-forming, nonlinear optical and holographic properties of "push-pull" type azochromophores with triphenyl moieties containing isophorene and pyranylidene fragments

Elmars Zarins, Andrejs Tokmakovs, Zane Kalnina, Valdis Kokars, Martins Rutkis, Andris Ozols, Peteris Augustovs, Kristine Lazdovica, Valdis Kampars

Proceedings Volume 8622, 86221H (2013) https://doi.org/10.1117/12.2003085

KEYWORDS: Holography, Glasses, Molecules, Diffraction, Absorption, Polymers, Nonlinear optics, Thin films, Data storage, Crystals

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Molecular organic compounds with electron donating fragment bounded through π-conjugated system with electron acceptor fragment, as well as with incorporated triphenyl groups in their molecules show potential for creating cheap and simple solution processable materials with nonlinear optical properties. Additional insertion of azobenzene fragment in their structures makes them also possible to form holographic volume and surface relief gratings (SRG) after exposure to laser radiation, which could be useful for holographic data storage. For these purposes polymers are generally used. However, their application is complicated and challenging task as in every attempt to obtain the same polymer it will have different physical properties. On the other hand, the synthetic procedure of molecular glasses is more simple as their structure and physical properties are strongly defined. Unfortunately, there is still no clear relation between compound organic structures and their thermal, glass-forming and optical properties.

In order to investigate the above mentioned regularities, we have synthesized and investigated ten molecular glassy organic compounds with three different fragments as main backbones of the molecules: indene-1,3-dione (WE-1, WE-2, WE-3), isophorene (IWK-1D, IWK-2M, IWK-2D) and pyranylidene (DWK-2TB, ZWK-2TB, JWK-2TB, ZWK-3AZO). Compounds containing isophorene fragment in their molecules had the highest NLO efficiencies (d₃₃ up to 125.7 pm/V for IWK-2D) and also were the most effective holographic data storage compounds with holographic self diffraction efficiency 13% and holographic diffraction efficiency 20%, also for IWK-2D, but their thermal stability (T_d from 288°C to 295°C) and glass transition (T_g from 90°C to 105°C) values were just average. Pyranylidene type compounds had the highest thermal stability and highest glass transition (T_g from 115°C to 180°C). But their ability to form and maintain amorphous structure were low and they had average NLO efficiencies (d₃₃ up to 66.2 pm/V for ZWK-2TB) and average holographic self diffraction efficiency 2% and holographic diffraction efficiency 8% for ZWK-3AZO. The molecules with just azobenzene fragment and indene-1,3-dione as electron acceptor has the lowest thermal (T_d from 250°C to 282°C, T_g from 70°C to 98°C) and also the lowest holographic properties with holographic diffraction and self diffraction efficiencies at 4% for WE-1 and lower for other compounds. Nevertheless, some of the investigated molecular glasses show potential as multifunctional optical materials.

Proceedings Article | 11 May 2011 Paper

Synthesis and properties of 1,3-dioxo-1[i]H[/i]-inden-2(3H)-ylidene fragment and (3-(dicyanomethylene)-5,5-dimethylcyclohex-1-enyl)vinyl fragment containing derivatives of azobenzene for holographic recording materials

Elmars Zarins, Valdis Kokars, Andris Ozols, Peteris Augustovs

Proceedings Volume 8074, 80740E (2011) https://doi.org/10.1117/12.886598

KEYWORDS: Holography, Glasses, Reflection, Solids, Holographic materials, Data storage, Thin films, Polarization, Liquids, Chromatography

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Proceedings Article | 2 December 2008 Paper

Effects of light polarization and crystal orientation on the holographic recording efficiency in doped LiNbO[sub]3[/sub] crystals

Andris Ozols, Mara Reinfelde

Proceedings Volume 7142, 71420Z (2008) https://doi.org/10.1117/12.814971

KEYWORDS: Crystals, Picosecond phenomena, Polarization, Holography, Electro optics, Dielectric polarization, Iron, Photorefraction, Copper, Annealing

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Proceedings Article | 2 December 2008 Paper

The energetical threshold of optical information detection due to thermal noise

A. Ozols, J. Porins, G. Ivanovs

Proceedings Volume 7142, 714218 (2008) https://doi.org/10.1117/12.815191

KEYWORDS: Photons, Photodetectors, Optical communications, Thermography, Thermal effects, Binary data, Interference (communication), Thermodynamics, Quantum efficiency, Black bodies

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Proceedings Article | 25 January 2007 Paper

Nanosecond and picosecond pulse transmission in optical fibres

Jurgis Porins, Andris Ozols, Pavels Onufrijevs

Proceedings Volume 6596, 65960X (2007) https://doi.org/10.1117/12.726467

KEYWORDS: Picosecond phenomena, Telecommunications, Absorption, Refractive index, Optical fibers, Thermal effects, Coating, Silica, Glasses, Wavelength division multiplexing

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Proceedings Article | 25 January 2007 Paper

Sub-bandgap light hologram recording in the amorphous chalcogenides

Andris Ozols, Dmitry Saharov

Proceedings Volume 6596, 65961C (2007) https://doi.org/10.1117/12.726508

KEYWORDS: Holograms, Holography, Glasses, Chalcogenides, Helium neon lasers, Chemical species, Diffraction, Crystals, Refractive index, Volume holography

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Proceedings Article | 13 June 2006 Paper

Angular selectivity of thin gratings

Andris Ozols, Mara Reinfelde

Proceedings Volume 5946, 59461H (2006) https://doi.org/10.1117/12.639328

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Proceedings Article | 18 April 2006 Paper

Phase conjugation properties of a-As-S-Se films

Andris Ozols, Kaspars Ozols, Girts Ivanovs

Proceedings Volume 6180, 61801O (2006) https://doi.org/10.1117/12.675743

KEYWORDS: Holography, Phase conjugation, Holograms, Spherical lenses, Chalcogenides, Wavefronts, Energy efficiency, Laser applications, Camera shutters, Signal processing

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Proceedings Article | 8 August 2003 Paper

Theoretical and experimental studies of light diffraction anisotropy by holograms in a-As-S-Se films

Andris Ozols, Mara Reinfelde

Proceedings Volume 5123, (2003) https://doi.org/10.1117/12.517014

KEYWORDS: Diffraction, Polarization, Anisotropy, Diffraction gratings, Holograms, Diffractive optical elements, Holography, Dichroic materials, Birefringence, Optical components

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Proceedings Article | 8 August 2003 Paper

Hologram recording in azobenzene oligomers

Andris Ozols, Valdis Kampars, Mara Reinfelde, Valdis Kokars

Proceedings Volume 5123, (2003) https://doi.org/10.1117/12.517010

KEYWORDS: Holography, Chromophores, Holograms, Matrices, Diffraction, Energy efficiency, Transmittance, Diffraction gratings, Refractive index, Organic materials

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Proceedings Article | 10 April 2001 Paper

Photoinduced anisotropy and holographic recording in amorphous chalcogenides

Andris Ozols, Mara Reinfelde, Olli Nordman, Nina Nordman

Proceedings Volume 4415, (2001) https://doi.org/10.1117/12.425471

KEYWORDS: Holograms, Polarization, Holography, Anisotropy, Diffraction, Chalcogenides, Modulation, Dichroic materials, Birefringence, Chemical species

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Proceedings Article | 15 March 2001 Paper

Holographic properties of dielectric crystals and amorphous semiconductor films

Andris Ozols, Mara Reinfelde

Proceedings Volume 4358, (2001) https://doi.org/10.1117/12.418883

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Proceedings Article | 1 January 1998 Paper

Mechanisms of holographic recording in amorphous semiconductor films

Andris Ozols, Nina Nordman, Olli Nordman

Proceedings Volume 3347, (1998) https://doi.org/10.1117/12.301418

KEYWORDS: Holography, Holograms, Chalcogenides, Amorphous semiconductors, Chemical species, Refractive index, Anisotropy, Diffraction, On-screen displays, Absorption

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Proceedings Article | 28 February 1997 Paper

Structure-relaxation-induced peculiarities of the holographic recording in amorphous As2S3 films

Andris Ozols, Olli Salminen, Paivi Riihola, Nina Nordman

Proceedings Volume 3055, (1997) https://doi.org/10.1117/12.267687

KEYWORDS: Holography, Modulation, Spatial frequencies, Refractive index, Diffraction, Glasses, Ultraviolet radiation, Solid state physics, Physics, Amorphous semiconductors

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Proceedings Article | 6 February 1997 Paper

Microhologram recording in amorphous semiconductor films

Andris Ozols, Girts Ivanovs, Maris Laudobelis

Proceedings Volume 2968, (1997) https://doi.org/10.1117/12.266854

KEYWORDS: Spatial frequencies, Amorphous semiconductors, Holography, Wavefronts, Diffraction gratings, Diffraction, Holograms, Gaussian beams, Spherical lenses, Helium neon lasers

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Proceedings Article | 6 February 1997 Paper

Holographic recording in amorphous semiconductor films

Andris Ozols, Nina Nordman, Olli Salminen, Paivi Riihola

Proceedings Volume 2968, (1997) https://doi.org/10.1117/12.266849

KEYWORDS: Holography, Holograms, Modulation, Amorphous semiconductors, Refractive index, Spatial frequencies, Diffraction, Molecules, Information operations, Chalcogenides

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Proceedings Article | 4 February 1997 Paper

Nonlinear optical losses in medical fibers

Andris Ozols, Girts Ivanovs, Guntars Coders

Proceedings Volume 2967, (1997) https://doi.org/10.1117/12.266552

KEYWORDS: Absorption, Picosecond phenomena, Signal attenuation, Optical fibers, Transmittance, Holography, Silica, Modulators, Optical filters, Nonlinear filtering

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Showing 5 of 18 publications

SPIE Conference Volume | 12 November 2008

Sixth International Conference on Advanced Optical Materials and Devices (AOMD-6)

SPIE Conference Volume | 6 February 1997

Optical Organic and Semiconductor Inorganic Materials

Conference Committee Involvement (2)

Sixth International Conference on Advanced Optical Materials and Devices

24 August 2008 | Riga, Latvia

Optical Organic and Semiconductor Inorganic Materials

26 August 1996 | Riga, Latvia

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