Dr. Vít Jirásek Profile

Dr. Vít Jirásek

at Institute of Physics of the CAS vvi

SPIE Involvement:

Author

Publications (34)

Proceedings Article | 21 May 2015 Paper

Finite element analysis of AlGaN/GaN micro-diaphragms with diamond coating

J. Dzuba, G. Vanko, M. Vojs, I. Rýger, T. Ižák, V. Jirásek, V. Kutiš, T. Lalinský

Proceedings Volume 9517, 95171I (2015) https://doi.org/10.1117/12.2179126

KEYWORDS: Diamond, Sensors, Coating, Finite element methods, Gallium nitride, Microelectromechanical systems, Silicon, Temperature metrology, Thermal effects, Field effect transistors

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Proceedings Article | 30 January 2013 Paper

Overview of iodine generation for oxygen-iodine lasers

Vít Jirásek

Proceedings Volume 8677, 867707 (2013) https://doi.org/10.1117/12.2010555

KEYWORDS: Artificial intelligence, Iodine, Chemical oxygen iodine lasers, Chemical species, Argon, Solids, Industrial chemicals, Molecules, iodine lasers, Molecular lasers

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A review of the methods for generation of iodine for oxygen-iodine lasers (OIL) is presented. The chemical and physical methods for production of both atomic (AI) and molecular (MI) iodine have been searched in order to improve the efficiency and/or technology of OILs. These trials were motivated by the estimations that a substantial part of singlet oxygen (SO) could be saved with these methods and the onset of the laser active medium will be accelerated. Vapour of MI can be generated by the evaporation of solid or pressurized liquid I₂, or synthesized in situ by the reaction of Cl₂ with either HI or CuI₂. The chemical methods of generation of AI are based on the substitution of I atom in a molecule of HI or ICl by another halogen atom produced usually chemically. The discharge methods include the dissociation of various iodine compounds (organic iodides, I₂, HI) in the RF, MW, DC-pulsed or DC-vortex stabilized discharge. Combined methods use discharge dissociation of molecules (H₂, F₂) to gain atoms which subsequently react to replace AI from the iodine compound. The chemical methods were quite successful in producing AI (up to the 100% yield), but the enhancement of the laser performance was not reported. The discharge methods had been subsequently improving and are today able to produce up to 0.4 mmol/s of AI at the RF power of 500 W. A substantial enhancement of the discharge- OIL performance (up to 40%) was reported. In the case of Chemical-OIL, the enhancement was reported only under the conditions of a low I₂/O₂ ratio, where the “standard” I₂ dissociation by SO is slow. The small-signal gain up to 0.3 %/cm was achieved on the supersonic COIL using the HI dissociated in the RF discharge. Due to the complicated kinetics of the RI-I-I₂-SO system and a strong coupling with the gas flow and mixing, the theoretical description of the problem is difficult. It, however, seems that we can expect the major improvement of the OIL performance for those systems, where the SO yield is rather low (DOIL) or for the high-pressure COIL, where the quenching processes are important and the shortage of the distance needed for the preparation of active media is essential.

Proceedings Article | 30 January 2013 Paper

Centrifugal spray singlet oxygen generator for a COIL with nitrogen as a buffer gas

Otomar Špalek, Vít Jirásek, Miroslav Čenský, Jarmila Kodymová

Proceedings Volume 8677, 867706 (2013) https://doi.org/10.1117/12.2010590

KEYWORDS: Chlorine, Nitrogen, Oxygen, Liquids, Chemical oxygen iodine lasers, Chemical lasers, Temperature metrology, Chlorine gas, Laser development, Aerosols

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Proceedings Article | 30 January 2013 Paper

Hybrid RF/DC discharge generator of singlet oxygen for DOIL

Josef Schmiedberger, Jan Gregor, Vít Jirásek, Karel Rohlena, Miroslav Čenský

Proceedings Volume 8677, 867703 (2013) https://doi.org/10.1117/12.2010047

KEYWORDS: Plasma, Oxygen, Aluminum, Electrons, Tungsten, Electrodes, Continuous wave operation, Pulsed laser operation, Argon, Inductance

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Proceedings Article | 16 November 2010 Paper

Advances in the RF atomic iodine generator for oxygen-iodine laser

Vít Jirásek, Josef Schmiedberger, Miroslav Čenský, Jarmila Kodymová

Proceedings Volume 7751, 77510B (2010) https://doi.org/10.1117/12.880739

KEYWORDS: Iodine, Electrodes, Argon, Oxygen, Chemical species, Laser beam diagnostics, Energy efficiency, Protactinium, Laser resonators, Chemical lasers

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Proceedings Article | 16 November 2010 Paper

COIL operation with a gas-phase chemical generation of molecular iodine

Vít Jirásek, Otomar Špalek, Miroslav Čenský, Jarmila Kodymová

Proceedings Volume 7751, 77510I (2010) https://doi.org/10.1117/12.881085

KEYWORDS: Iodine, Chemical oxygen iodine lasers, Industrial chemicals, Solids, Throat, Chemical lasers, Oxygen, Mirrors, Temperature metrology, Molecular lasers

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Proceedings Article | 16 November 2010 Paper

Hybrid RF/DC plasma torch for generation of singlet oxygen in discharge oxygen-iodine laser

Josef Schmiedberger, Karel Rohlena, Jan Gregor, Petr Křenek, Vít Jirásek, Miroslav Čenský, Jarmila Kodymová

Proceedings Volume 7751, 77510G (2010) https://doi.org/10.1117/12.880937

KEYWORDS: Plasma, Oxygen, Electrons, Plasma generation, Iodine, Aluminum, Tellurium, Electromagnetism, Argon, Electrodes

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Proceedings Article | 16 November 2010 Paper

Chemical oxygen-iodine laser with a centrifugal spray generator of singlet oxygen

Otomar Špalek, Vít Jirásek, Miroslav Čenský, Jarmila Kodymová

Proceedings Volume 7751, 77510H (2010) https://doi.org/10.1117/12.880740

KEYWORDS: Chlorine, Iodine, Oxygen, Chemical lasers, Liquids, Throat, Helium, Chemical oxygen iodine lasers, Resonators, Aerosols

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Proceedings Article | 22 April 2009 Paper

Study of COIL active medium with atomic iodine generated via fluorine atoms

Vít Jirásek, Otomar Špalek, Miroslav Censký, Jarmila Kodymová, Irena Picková, Ivo Jakubec

Proceedings Volume 7131, 71310M (2009) https://doi.org/10.1117/12.816700

KEYWORDS: Iodine, Chemical species, Fluorine, Chemical oxygen iodine lasers, Gases, Temperature metrology, Laser resonators, Chemical lasers, Chlorine, Throat

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Proceedings Article | 18 April 2009 Paper

Spray generator of singlet oxygen with a centrifugal separation of liquid

Otomar Špalek, Vít Jirásek, Miroslav Censký, Jarmila Kodymová, Irena Picková

Proceedings Volume 7131, 71310H (2009) https://doi.org/10.1117/12.816713

KEYWORDS: Chlorine, Liquids, Oxygen, Chemical oxygen iodine lasers, Chemical lasers, Chlorine gas, Aerosols, Helium, Laser development, Industrial chemicals

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Proceedings Article | 18 April 2009 Paper

Initial development of hybrid plasma jet generator of O2(1Δ) for DOIL

Josef Schmiedberger, Karel Rohlena, Petr Filip, Jan Gregor, Milan Hrabovský, Petr Krenek, Vít Jirásek, Jarmila Kodymová

Proceedings Volume 7131, 71310U (2009) https://doi.org/10.1117/12.816695

KEYWORDS: Plasma, Oxygen, Argon, Plasma generation, Electrons, Aluminum, Electrodes, Energy transfer, Electronic components, Switches

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Proceedings Article | 18 April 2009 Paper

RF discharge generation of I atoms in CH3I and CF3I for COIL/DOIL

Josef Schmiedberger, Vít Jirásek, Miroslav Censký, Irena Picková, Jarmila Kodymová

Proceedings Volume 7131, 71310E (2009) https://doi.org/10.1117/12.816693

KEYWORDS: Iodine, Chemical species, Chemical oxygen iodine lasers, Argon, Protactinium, Electrodes, Chemical lasers, Aluminum, Ultraviolet radiation

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Proceedings Article | 20 February 2009 Paper

Research on advanced chemical and discharge oxygen-iodine lasers

Jarmila Kodymová, Vít Jirásek, Josef Schmiedberger, Otomar Spalek, Miroslav Censký

Proceedings Volume 7196, 719602 (2009) https://doi.org/10.1117/12.807723

KEYWORDS: Oxygen, Iodine, Argon, Plasma, Chlorine, Liquids, Aluminum, Chemical oxygen iodine lasers, Temperature metrology, Aerosols

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Proceedings Article | 26 April 2007 Paper

Advanced spray generator of singlet oxygen

Otomar Spalek, Jan Hrubý, Vít Jirásek, Miroslav Čenský, Jarmila Kodymová, Irena Picková

Proceedings Volume 6346, 63460C (2007) https://doi.org/10.1117/12.737172

KEYWORDS: Chlorine, Liquids, Oxygen, Chemical lasers, Data modeling, Atmospheric modeling, Chemical oxygen iodine lasers, Chlorine gas, Aerosols, Mathematical modeling

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Proceedings Article | 26 April 2007 Paper

COIL with supersonic injection of chemically produced atomic iodine

Vít Jirásek, Otomar Špalek, Miroslav Čenský, Jarmila Kodymová, Irena Picková, Ivo Jakubec

Proceedings Volume 6346, 63462J (2007) https://doi.org/10.1117/12.739104

KEYWORDS: Iodine, Chlorine, Laser resonators, Chemical species, Chemical oxygen iodine lasers, Oxygen, Chemical lasers, Throat, Helium, Temperature metrology

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Proceedings Article | 26 April 2007 Paper

Development of COIL with chemically generated atomic iodine

Miroslav Čenský, Otomar Špalek, Vít Jirásek, Jarmila Kodymová, Ivo Jakubec

Proceedings Volume 6611, 661102 (2007) https://doi.org/10.1117/12.740573

KEYWORDS: Iodine, Chemical species, Chlorine, Chemical oxygen iodine lasers, Nitrogen, Throat, Laser resonators, NOx, Resonators, Chemical lasers

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Proceedings Article | 9 June 2006 Paper

Chemical oxygen-iodine laser with instantaneous production of atomic iodine from gaseous reactants

V. Jirásek, O. Špalek, M. Čenský, Ja. Kodymov, I. Jakubec

Proceedings Volume 6053, 605307 (2006) https://doi.org/10.1117/12.660052

KEYWORDS: Iodine, Chemical species, Chlorine, Chemical lasers, Nitrogen, Gases, Throat, Chemical oxygen iodine lasers, Laser resonators, Oxygen

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Proceedings Article | 7 June 2006 Paper

Development of advanced generator of singlet oxygen for a COIL

Jarmila Kodymova, Otomar Špalek, Vít Jirásek, Miroslav Čenský, Jan Hrubý

Proceedings Volume 6261, 62611S (2006) https://doi.org/10.1117/12.674692

KEYWORDS: Chlorine, Liquids, Oxygen, Chemical lasers, Nitrogen, Chemical oxygen iodine lasers, Estimation theory, Chemistry, Atmospheric modeling, Diffusion

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Proceedings Article | 7 June 2006 Paper

Chemical oxygen-iodine laser with atomic iodine generated in a separate reactor

Otomar Špalek, Vít Jirásek, Miroslav Čenský, Jarmila Kodymova, Irena Pickova, Ivo Jakubec

Proceedings Volume 6261, 62611T (2006) https://doi.org/10.1117/12.674693

KEYWORDS: Iodine, Chemical species, Fluorine, Chlorine, Chemical oxygen iodine lasers, Chemical lasers, Gases, Nitrogen, Oxygen, Industrial chemicals

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Proceedings Article | 12 October 2005 Paper

Development of COIL with atomic iodine generation via F atoms

Miroslav Čenský, Otomar Špalek, Vít Jirásek, Jarmila Kodymova, Ivo Jakubec

Proceedings Volume 5958, 595830 (2005) https://doi.org/10.1117/12.622690

KEYWORDS: Iodine, Fluorine, Chemical species, Chemical oxygen iodine lasers, Chemical lasers, Nitrogen, Gases, Laser beam diagnostics, Diagnostics, Oxygen

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Proceedings Article | 23 March 2005 Paper

CFD modeling of an instantaneous generation of atomic iodine in chemical oxygen-iodine laser

Vit Jirasek

Proceedings Volume 5777, (2005) https://doi.org/10.1117/12.611172

KEYWORDS: Chlorine, Iodine, Chemical lasers, 3D modeling, NOx, Chemical species, Throat, Chemistry, Nitrogen, Numerical simulations

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Proceedings Article | 23 March 2005 Paper

Chemical oxygen-iodine laser with atomic iodine generated via Cl or F atoms

Otomar Spalek, Vit Jirasek, Miroslav Censky, Jarmila Kodymova, Ivo Jakubec, Gordon Hager

Proceedings Volume 5777, (2005) https://doi.org/10.1117/12.611007

KEYWORDS: Iodine, Chlorine, Chemical species, Chemical oxygen iodine lasers, Fluorine, Chemical lasers, Gases, Nitrogen, Oxygen, Chlorine gas

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Proceedings Article | 23 March 2005 Paper

Generation of atomic iodine for a COIL via atomic fluorine at higher pressure

Miroslav Censky, Otomar Spalek, Vit Jirasek, Jarmila Kodymova, Ivo Jakubec

Proceedings Volume 5777, (2005) https://doi.org/10.1117/12.611013

KEYWORDS: Iodine, Chemical species, Fluorine, Chemical oxygen iodine lasers, Chemical lasers, Nitrogen, Oxygen, Gases, Optical resonators, Oxides

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Proceedings Article | 20 September 2004 Paper

Atomic iodine generation via F atoms for COIL

Otomar Spalek, Vit Jirasek, Miroslav Censky, Jarmila Kodymova, Ivo Jakubec, Gordon Hager

Proceedings Volume 5448, (2004) https://doi.org/10.1117/12.544272

KEYWORDS: Iodine, Fluorine, Chemical species, Gases, Chemical oxygen iodine lasers, Chemical lasers, Temperature metrology, Chlorine, Molecules, Laser beam diagnostics

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Proceedings Article | 16 June 2004 Paper

Advanced COIL based on atomic iodine generation using gaseous reactants

Jarmila Kodymova, Otomar Spalek, Miroslav Censky, Vit Jirasek, Gordon Hager

Proceedings Volume 5479, (2004) https://doi.org/10.1117/12.558179

KEYWORDS: Chemical species, Iodine, Chemical oxygen iodine lasers, Chlorine, Fluorine, Gases, Oxygen, Molecules, Nitrogen, NOx

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Proceedings Article | 11 May 2004 Paper

Chemical generation of atomic iodine for a COIL via atomic fluorine

Miroslav Censky, Otomar Spalek, Vit Jirasek, Jarmila Kodymova, Ivo Jakubec

Proceedings Volume 5334, (2004) https://doi.org/10.1117/12.538776

KEYWORDS: Fluorine, Iodine, Chemical species, Chemical oxygen iodine lasers, Gases, Temperature metrology, Chemical lasers, Molecules, Laser beam diagnostics, Industrial chemicals

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Proceedings Article | 10 November 2003 Paper

Mixing of gaseous reactants in chemical generation of atomic iodine for COIL: two-dimensional study

Vit Jirasek, Otomar Spalek, Jarmila Kodymova, Miroslav Censky

Proceedings Volume 5120, (2003) https://doi.org/10.1117/12.515591

KEYWORDS: Chlorine, Iodine, Diffusion, Chemical oxygen iodine lasers, Nitrogen, Systems modeling, NOx, Chemical lasers, Industrial chemicals, Chemistry

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Proceedings Article | 10 November 2003 Paper

Experimental results on chemical generation of atomic iodine via Cl atoms for chemical oxygen-iodine laser

Otomar Spalek, Vit Jirasek, Miroslav Censky, Jarmila Kodymova, Ivo Jakubec, Gordon Hager

Proceedings Volume 5120, (2003) https://doi.org/10.1117/12.515576

KEYWORDS: Iodine, Chemical oxygen iodine lasers, Chlorine, Chemical species, Chemical lasers, Nitrogen, Oxygen, Hydrogen, Throat, Molecules

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Proceedings Article | 5 June 2003 Paper

Chemical oxygen-iodine laser with a new method of atomic iodine generation

Otomar Spalek, Miroslav Censky, Vit Jirasek, Jarmila Kodymova, Ivo Jakubec, Gordon Hager

Proceedings Volume 4971, (2003) https://doi.org/10.1117/12.483503

KEYWORDS: Iodine, Chlorine, Chemical oxygen iodine lasers, Chemical lasers, Chemical species, Oxygen, Gases, Throat, Nitrogen, Molecules

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Proceedings Article | 13 September 2002 Paper

Recent results in the development of a chemical way of atomic iodine generation for a COIL

Jarmila Kodymova, Otomar Spalek, Vit Jirasek, Miroslav Censky, Gordon Hager

Proceedings Volume 4760, (2002) https://doi.org/10.1117/12.482074

KEYWORDS: Iodine, Chemical species, Fluorine, Chlorine, Chemical oxygen iodine lasers, Neodymium, Systems modeling, Oxygen, Molecules, Diagnostics

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Proceedings Article | 6 May 2002 Paper

Modeling of the chemical generation of atomic iodine in a chemical oxygen-iodine laser

Vit Jirasek, Otomar Spalek, Jarmila Kodymova, Miroslav Censky

Proceedings Volume 4631, (2002) https://doi.org/10.1117/12.465790

KEYWORDS: Chemical species, Fluorine, Iodine, Chemical lasers, Oxygen, Industrial chemicals, Molecules, Helium, Systems modeling, Mathematical modeling

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