Dr. Karol Waichman Profile

Dr. Karol Waichman

Senior Scientist at Ben-Gurion Univ of the Negev

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Publications (27)

Proceedings Article | 7 November 2022 Paper

Advanced DPAL modeling

Boris Barmashenko, Karol Waichman, Gilead Eliyahu-Caspi, Guy Makov, Salman Rosenwaks

Proceedings Volume 12347, 1234703 (2022) https://doi.org/10.1117/12.2654153

KEYWORDS: Rubidium, Chemical species, Methane, Ions, 3D modeling, Potassium, Ionization, Electrons, Gas lasers, Diffusion

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Proceedings Article | 13 September 2021 Presentation + Paper

Modeling of K and Rb DPALs

Boris Barmashenko, Karol Waichman, Salman Rosenwaks

Proceedings Volume 11867, 118670N (2021) https://doi.org/10.1117/12.2601517

KEYWORDS: Rubidium, Methane, 3D modeling, Ionization, Chemical species, Potassium, Gas lasers, Electrons, Diffusion, Ions

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Proceedings Article | 9 November 2017 Paper

Scaling up and controlling beam quality of flowing-gas diode pumped potassium laser with different pumping geometries: 3D CFD modeling

Eyal Yacoby, Karol Waichman, Oren Sadot, Boris Barmashenko, Salman Rosenwaks

Proceedings Volume 10436, 104360D (2017) https://doi.org/10.1117/12.2277689

KEYWORDS: Optical pumping, Lasers, 3D modeling, Refractive index, Potassium, Output couplers, Laser beam propagation, Chemical species, Wavefronts, Semiconductor lasers

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Proceedings Article | 5 October 2017 Paper

Three-dimensional simulation of beam propagation and heat transfer in static gas Cs DPALs using wave optics and fluid dynamics models

Karol Waichman, Boris Barmashenko, Salman Rosenwaks

Proceedings Volume 10436, 104360F (2017) https://doi.org/10.1117/12.2277992

KEYWORDS: 3D modeling, Wave propagation, Laser beam propagation, Cesium, Fluid dynamics, Optical simulations, Diodes, Semiconductor lasers, Gas lasers, Thermal effects

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Proceedings Article | 13 January 2017 Paper

3D CFD modeling of flowing-gas DPALs with different pumping geometries and various flow velocities

Eyal Yacoby, Karol Waichman, Oren Sadot, Boris Barmashenko, Salman Rosenwaks

Proceedings Volume 10254, 102540O (2017) https://doi.org/10.1117/12.2256026

KEYWORDS: 3D modeling, Cesium, Lasers, Optical pumping, Medium wave, Chemical species, Ionization, Laser beam propagation, Resonators, Computational fluid dynamics

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Proceedings Article | 22 April 2016 Paper

Modeling of static and flowing-gas diode pumped alkali lasers

Boris Barmashenko, Ilya Auslender, Eyal Yacoby, Karol Waichman, Oren Sadot, Salman Rosenwaks

Proceedings Volume 9729, 972904 (2016) https://doi.org/10.1117/12.2214975

KEYWORDS: Diodes, Cesium, 3D modeling, Gas lasers, Pulsed laser operation, Chemical species, Fluid dynamics, Optical pumping, Medium wave, Laser resonators, Lasers, Absorption

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Proceedings Article | 13 October 2015 Paper

CFD assisted simulation of temperature distribution and laser power in pulsed and CW pumped static gas DPALs

Karol Waichman, Boris Barmashenko, Salman Rosenwaks

Proceedings Volume 9650, 96500C (2015) https://doi.org/10.1117/12.2193879

KEYWORDS: Cesium, 3D modeling, Pulsed laser operation, Resonators, Continuous wave operation, Semiconductor lasers, Laser resonators, Thermal effects, Thermography, Refraction

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Proceedings Article | 13 October 2015 Paper

Supersonic diode pumped alkali lasers: Computational fluid dynamics modeling

Salman Rosenwaks, Eyal Yacoby, Karol Waichman, Oren Sadot, Boris Barmashenko

Proceedings Volume 9650, 96500A (2015) https://doi.org/10.1117/12.2193574

KEYWORDS: 3D modeling, Cesium, Ionization, Optical pumping, Resonators, Laser resonators, Semiconductor lasers, Diodes, Chemical species, Computational fluid dynamics

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Proceedings Article | 3 February 2015 Paper

Semi-analytical and CFD model calculations of subsonic flowing-gas DPALs and their comparison to experimental results

Boris Barmashenko, Salman Rosenwaks, Karol Waichman

Proceedings Volume 9255, 925520 (2015) https://doi.org/10.1117/12.2070676

KEYWORDS: 3D modeling, Cesium, Ionization, Chemical species, Absorption, Laser resonators, Mirrors, Resonators, Rubidium, Chemical reactions

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Proceedings Article | 7 October 2014 Paper

Comparison of semi-analytical to CFD model calculations and to experimental results of subsonic flowing-gas and static DPALs

Boris Barmashenko, Salman Rosenwaks, Karol Waichman

Proceedings Volume 9251, 92510V (2014) https://doi.org/10.1117/12.2067020

KEYWORDS: 3D modeling, Chemical species, Ionization, Cesium, Chemical reactions, Absorption, Convection, Rubidium, Laser applications, Semiconductor lasers

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Proceedings Article | 7 October 2014 Paper

CFD DPAL modeling for various schemes of flow configurations

Karol Waichman, Boris Barmashenko, Salman Rosenwaks

Proceedings Volume 9251, 92510U (2014) https://doi.org/10.1117/12.2067019

KEYWORDS: Cesium, 3D modeling, Ionization, Resonators, Chemical species, Semiconductor lasers, Mirrors, Gas lasers, Laser resonators

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Proceedings Article | 7 October 2014 Paper

Theoretical studies of the feasibility of supersonic DPALs

Salman Rosenwaks, Boris Barmashenko, Karol Waichman

Proceedings Volume 9251, 92510W (2014) https://doi.org/10.1117/12.2067011

KEYWORDS: 3D modeling, Cesium, Chemical species, Resonators, Diffusers, Instrument modeling, Ionization, Optical pumping, Laser resonators, Absorption

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Results of recent semi-analytical and three dimensional computational fluid dynamics (3D CFD) modeling of supersonic diode pumped alkali lasers (DPALs), as well as summary of work in progress, are reported. DPALs have been extensively studied in the past few years and static and flowing-gas devices have been investigated. Modeling of these devices has been conducted as well and fluid dynamics and kinetic processes have been taken into account, but until recently only flowing-gas DPALs with subsonic velocity of the gas were considered. Following our previous work on supersonic DPALs we further explore in the present study the feasibility of operating DPALs with supersonic expansion of the gaseous laser mixture, consisting of alkali atoms, He atoms and (frequently) hydrocarbon molecules. The motivation for this exploration stems from the possibility of fast and efficient cooling of the mixture by the supersonic expansion. In a recent paper (S. Rosenwaks et al, Proc. SPIE 8962, 896209 (2014)) we have reported on semi-analytical modeling for a supersonic Cs DPAL with parameters similar to those of the 1-kW flowing-gas subsonic Cs DPAL (A.V. Bogachev et al, Quantum Electron. 42, 95 (2012)); the maximum power, P_lase, for the former was found to be higher than for the latter by 25%. Optimization of the He/CH₄ buffer gas composition and flow parameters using 3D CFD modeling shows that for Bogachev et al resonator parameters, extremely high lasing power and optical-to-optical efficiency, 33 kW and 82%, respectively, are achievable in the Cs supersonic device. Comparison between the semi-analytical and the 3D CFD models for Cs shows that the latter predicts much higher maximum achievable laser power than the former. For a supersonic K DPAL the semi-analytical model predicts P_lase = 43 kW, 70% higher than for subsonic with the same resonator and K density at the inlet, the maximum optical-to-optical efficiency being 82%. The paper also includes estimates for closed cycle supersonic systems.

Proceedings Article | 25 February 2014 Paper

Semi-analytical and 3D CFD DPAL modeling: feasibility of supersonic operation

Salman Rosenwaks, Boris Barmashenko, Karol Waichman

Proceedings Volume 8962, 896209 (2014) https://doi.org/10.1117/12.2036744

KEYWORDS: 3D modeling, Cesium, Chemical species, Laser resonators, Resonators, Ionization, Absorption, Semiconductor lasers, Diodes, Molecules

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Proceedings Article | 25 February 2014 Paper

Kinetic and fluid dynamic processes in diode pumped alkali lasers: semi-analytical and 2D and 3D CFD modeling

Boris Barmashenko, Salman Rosenwaks, Karol Waichman

Proceedings Volume 8962, 89620C (2014) https://doi.org/10.1117/12.2036073

KEYWORDS: 3D modeling, Chemical species, Ionization, Cesium, Convection, Diffusion, Chemical reactions, Absorption, Semiconductor lasers, Fluid dynamics

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Proceedings Article | 15 October 2013 Paper

Model calculations of kinetic and fluid dynamic processes in diode pumped alkali lasers

Boris Barmashenko, Salman Rosenwaks, Karol Waichman

Proceedings Volume 8898, 88980W (2013) https://doi.org/10.1117/12.2026931

KEYWORDS: Cesium, Chemical species, Ionization, Chemical reactions, Diffusion, Convection, Ions, Diodes, Absorption, Semiconductor lasers

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Proceedings Article | 15 October 2013 Paper

What can we gain from supersonic operation of diode pumped alkali lasers: model calculations

S. Rosenwaks, B. Barmashenko, K. Waichman

Proceedings Volume 8898, 88980X (2013) https://doi.org/10.1117/12.2026932

KEYWORDS: Cesium, 3D modeling, Chemical species, Laser resonators, Resonators, Diodes, Semiconductor lasers, Instrument modeling, Absorption, Computational fluid dynamics

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Proceedings Article | 16 November 2010 Paper

Lasing in supersonic chemical oxygen-iodine lasers: recent modeling and comparison with experiment

Boris Barmashenko, Karol Waichman, Salman Rosenwaks

Proceedings Volume 7751, 775107 (2010) https://doi.org/10.1117/12.878602

KEYWORDS: Resonators, Mirrors, Chemical lasers, 3D modeling, Lawrencium, Geometrical optics, Laser resonators, Chemical oxygen iodine lasers, Data modeling, Near field optics

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Proceedings Article | 16 November 2010 Paper

A historical overview on the mechanism of the COIL kinetics

Salman Rosenwaks, Boris Barmashenko, Karol Waichman

Proceedings Volume 7751, 775106 (2010) https://doi.org/10.1117/12.878600

KEYWORDS: 3D modeling, Chemical oxygen iodine lasers, Mirrors, Throat, Resonators, Oxygen, Iodine, Chemical lasers, Data modeling, Chemical species

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Proceedings Article | 18 April 2009 Paper

A computational fluid dynamics simulation of a high pressure ejector COIL and comparison to experiments

Karol Waichman, Boris Barmashenko, Salman Rosenwaks

Proceedings Volume 7131, 71310R (2009) https://doi.org/10.1117/12.816445

KEYWORDS: 3D modeling, Chemical oxygen iodine lasers, Oxygen, Temperature metrology, Iodine, Doppler effect, Chemical lasers, Turbulence, Computational fluid dynamics, Motion models

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Proceedings Article | 18 April 2009 Paper

Supersonic COILs at Ben-Gurion University: (1) experiments on 10-cm gain-length device and (2) computational fluid dynamics modelling

Ilan Brami-Rosilio, Karol Waichman, Boris Barmashenko, Salman Rosenwaks

Proceedings Volume 7131, 71310D (2009) https://doi.org/10.1117/12.816447

KEYWORDS: 3D modeling, Chemical oxygen iodine lasers, Oxygen, Chemical lasers, Computational fluid dynamics, Mirrors, Iodine, Chlorine, Modeling, Systems modeling

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Proceedings Article | 26 April 2007 Paper

A computational fluid dynamics simulation of a supersonic chemical oxygen-iodine laser

K. Waichman, V. Rybalkin, A. Katz, Z. Dahan, B. Barmashenko, S. Rosenwaks

Proceedings Volume 6346, 63462D (2007) https://doi.org/10.1117/12.739080

KEYWORDS: 3D modeling, Chemical lasers, Chemical oxygen iodine lasers, Iodine, Computational fluid dynamics, Molecules, 3D metrology, Computer simulations, Optical simulations, Chemical reactions

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Proceedings Article | 26 April 2007 Paper

Studies of iodine dissociation in the chemical oxygen-iodine laser

V. Rybalkin, A. Katz, K. Waichman, D. Vingurt, Z. Dahan, B. Barmashenko, S. Rosenwaks

Proceedings Volume 6346, 63460A (2007) https://doi.org/10.1117/12.737166

KEYWORDS: Iodine, Chemical oxygen iodine lasers, Chemical lasers, Molecules, Chemical analysis, Oxygen, Chemical species, Absorption, Resonators, Diagnostics

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Proceedings Article | 28 March 2002 Paper

Passively Q-switched diode-pumped Yb:YAG laser using Cr4+ -doped garnets

Yehoshua Kalisky, Christophe Labbe, Karol Waichman, Leonid Kravchik, U. Rachum, Peizhen Deng, Jun Xu, Jun Dong, Wei Chen

Proceedings Volume 4628, (2002) https://doi.org/10.1117/12.460816

KEYWORDS: Chromium, Ytterbium, Crystals, YAG lasers, Absorption, Semiconductor lasers, Q switched lasers, Rod lasers, Diodes, Laser crystals

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Proceedings Article | 1 May 2001 Paper

Repetitive modulation and passive Q-switching of diode end-pumped Nd-KGW laser

Yehoshua Kalisky, Leonid Kravchik, Karol Waichman, Christophe Labbe

Proceedings Volume 4268, (2001) https://doi.org/10.1117/12.424643

KEYWORDS: Chromium, YAG lasers, Semiconductor lasers, Crystals, Modulation, Neodymium, Diodes, Q switching, Q switched lasers, Laser crystals

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Proceedings Article | 14 April 2000 Paper

Gain- and laser-mode studies of diode-side-pumped Nd-doped lasers

Yehoshua Kalisky, Leonid Kravchik, Jacob Kagan, Karol Waichman

Proceedings Volume 3929, (2000) https://doi.org/10.1117/12.382793

KEYWORDS: Nd:YAG lasers, Neodymium lasers, Optical pumping, Semiconductor lasers, Pulsed laser operation, Q switched lasers, Q switching, Rod lasers, Mirrors, Diodes

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Proceedings Article | 29 March 1996 Paper

Effect of geometry and preionization conditions on the performance of atmospheric pressure HF chemical laser

Yehoshua Kalisky, Karol Waichman, S. Kamin, D. Chuchem

Proceedings Volume 2702, (1996) https://doi.org/10.1117/12.236869

KEYWORDS: Capacitors, Plasma, Laser energy, Hydrogen fluoride lasers, Helium, Electrodes, Chemical lasers, Atmospheric plasma, Dielectrics, Information operations

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Proceedings Article | 1 May 1990 Paper

Turbulence produced by injection of heated jets

Karol Waichman, James Moran, E. Gozewski

Proceedings Volume 1221, (1990) https://doi.org/10.1117/12.18355

KEYWORDS: Turbulence, Atmospheric propagation, Laser beam propagation, Temperature metrology, Earth's atmosphere, Velocity measurements, Atmospheric turbulence, Data acquisition, Thermal blooming, Near field

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Showing 5 of 27 publications

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