Prof. Norman Tolk Profile

Prof. Norman Tolk

Professor at Vanderbilt Univ

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Author

Publications (19)

Proceedings Article | 19 April 2017 Presentation

Observation of ultrafast temporal evolution of symmetry in short-pulsed laser induced transient states of matter (Conference Presentation)

Joy Garnett, Halina Krzyzanowska, Andrey Baydin, Norman Tolk

Proceedings Volume 10102, 1010219 (2017) https://doi.org/10.1117/12.2253420

KEYWORDS: Femtosecond phenomena, Gallium arsenide, Ultrafast phenomena, States of matter, Harmonic generation, Second-harmonic generation, Semiconductors, Electrons, Condensed matter physics, Semiconductor lasers

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Proceedings Article | 10 October 2012 Paper

SHG investigation of ferroelectricity, domain orientations, and phases of monolithic PVDF thin films

J. Jones, L. Zhu, N. Tolk, R. Mu

Proceedings Volume 8465, 84650S (2012) https://doi.org/10.1117/12.930286

KEYWORDS: Second-harmonic generation, Ferroelectric polymers, Crystals, Thin films, Polymer thin films, Polymers, FT-IR spectroscopy, Annealing, Harmonic generation, Interfaces

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Proceedings Article | 2 March 2010 Paper

Spin dynamics and manipulation in GaMnAs alloys

X. Liu, Y. Y. Zhou, E. Harley, L. McNeil, J. Wang, J. Qi, Y. Xu, A. Steigerwald, N. Tolk, J. Zahn, A. Gamouras, S. March, K. Hall, J. Furdyna

Proceedings Volume 7600, 76000T (2010) https://doi.org/10.1117/12.840415

KEYWORDS: Magnetism, Anisotropy, Picosecond phenomena, Magnons, Manganese, Femtosecond phenomena, Spin dynamics, Semiconductors, Ultrafast phenomena, Ferromagnetics

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Proceedings Article | 30 December 2008 Paper

Interaction of high-power infrared radiation with germanium

D. Seo, L. Feldman, N. Tolk, P. Cohen

Proceedings Volume 7132, 713216 (2008) https://doi.org/10.1117/12.816611

KEYWORDS: Absorption, Transmittance, Germanium, Laser damage threshold, Free electron lasers, Infrared radiation, FT-IR spectroscopy, High power lasers, Mid-IR, Laser energy

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Proceedings Article | 4 January 2008 Paper

Control of coherent magnetization precession in GaMnAs by ultrafast optical excitation

J. Qi, Y. Xu, X. Liu, J. Furdyna, I. Perakis, N. Tolk

Proceedings Volume 6839, 68390J (2008) https://doi.org/10.1117/12.755487

KEYWORDS: Magnetism, Manganese, Anisotropy, Ultrafast phenomena, Temperature metrology, Physics, Polarization, Signal detection, Laser beam diagnostics, Ferromagnetics

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SPIE Journal Paper | 1 April 2003 Open Access

Time-resolved, light scattering measurements of cartilage and cornea denaturation due to free electron laser radiation

Emil Sobol, Alexander Sviridov, Moishe Kitai, Jonathan Gilligan, Norman Tolk, Glenn Edwards

JBO, Vol. 8, Issue 02, (April 2003) https://doi.org/10.1117/12.10.1117/1.1559996

KEYWORDS: Cartilage, Absorption, Light scattering, Free electron lasers, Cornea, Tissues, Laser tissue interaction, Tissue optics, Laser scattering, Optical testing

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Proceedings Article | 7 November 2002 Paper

Femtosecond optical studies of cuprates

Michael Schneider, S. Rast, Marshall Onellion, Jure Demsar, Antoinette Taylor, Yu Glinka, Norman Tolk, Yuhang Ren, Gunter Luepke, A. Klimov, Ying Xu, Roman Sobolewski, Weidong Si, X. Zeng, A. Soukiassian, Xiaoxing Xi, M. Abrecht, Daniel Ariosa, Davor Pavuna, Recardo Manzke, J. Printz, D. Parkhurst, K. Downum, P. Guptasarma, Ivan Bozovic

Proceedings Volume 4811, (2002) https://doi.org/10.1117/12.453707

KEYWORDS: Reflectivity, Lanthanum, Strontium, Superconductors, Thin films, Crystals, Bismuth, Femtosecond phenomena, Temperature metrology, Picosecond phenomena

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Proceedings Article | 26 June 2001 Paper

Infrared free-electron laser photoablation of diamond films

Judit Sturmann, Z. Marka, M. Albert, Royal Albridge, Jonathan Gilligan, Gunter Luepke, S. Singh, Jeffrey Davidson, Wolfgang Husinsky, Norman Tolk

Proceedings Volume 4423, (2001) https://doi.org/10.1117/12.431224

KEYWORDS: Laser ablation, Diamond, Absorption, Free electron lasers, Plasma, Laser damage threshold, Ions, Chemical vapor deposition, Particles, Ultraviolet radiation

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SPIE Journal Paper | 1 August 1999

Fabrication of single-mode chalcogenide fiber probes for scanning near-field infrared optical microscopy

David Schaafsma, Reza Mossadegh, Jasbinder Sanghera, Ishwar Aggarwal, M. Luce, Renato Generosi, P. Perfetti, Antonio Cricenti, Jonathan Gilligan, Norman Tolk

OE, Vol. 38, Issue 08, (August 1999) https://doi.org/10.1117/12.10.1117/1.602181

KEYWORDS: Near field scanning optical microscopy, Chalcogenides, Free electron lasers, Fiber lasers, Near field optics, Infrared microscopy, Infrared radiation, Optical microscopy, Absorption, Spatial resolution

Proceedings Article | 14 June 1999 Paper

Effect of wavelength on threshold and kinetics of tissue denaturation under laser radiation

Emil Sobol, Alexander Sviridov, Moishe Kitai, Jonathan Gilligan, Norman Tolk, Glenn Edwards

Proceedings Volume 3601, (1999) https://doi.org/10.1117/12.349995

KEYWORDS: Absorption, Cartilage, Light scattering, Free electron lasers, Cornea, Laser damage threshold, Laser tissue interaction, Tissues, Laser scattering, Tissue optics

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We consider the denaturation process as an alteration in ordered organization of tissue structure and study the threshold and kinetics of laser-induced denaturation in cartilage and cornea undergoing irradiation from a free electron laser (FEL) in the wavelength range 2.2 - 8.5 (mu) . Light-scattering by cartilage samples was measured in real- time during FEL irradiation using a 630-nm diode laser and a diode array with time resolution of 10 ms. We found that denaturation threshold is slightly lower than that for cartilage, and both depend on laser wavelength. A strong inverse correlation between denaturation thresholds and the absorption spectrum of the tissue is observed. Only for the wavelength region near the 3 (mu) water absorption band was the denaturation threshold not inversely proportional to the absorption coefficient. We believe this was because the radiation penetration depth was very small in this high- absorption region, so tissue denaturation occurred only in a layer too thin to produce significant light scattering. ATR spectra of 2.4 mm thick cartilage samples was measured before and after irradiation at 6.0 and 2.2 (mu) . At 6.0 (mu) , where the absorption is high, the spectrum of the irradiated (front) surface showed changes, while the spectrum of the back surface was identical to that before irradiation. This difference results from dramatic denaturation (with chemical bond breaking) at the front surface due to laser heating in a small absorption depth. For 2.2 (mu) irradiation, where the absorption is small, the spectra of the front and back of the irradiated sample were unchanged from before irradiation, while light scattering alteration shown the denaturation process began, for laser fluences above the denaturation threshold. This indicates that the absorption is too small to produce deep denaturation of the tissue with dramatic alteration of structure. Thus, we have shown that light scattering is useful for measuring denaturation thresholds and kinetics for biotissues except where the initial absorptivity is very high.

Proceedings Article | 23 April 1996 Paper

Ablation in teeth with the free-electron laser around the absorption peak of hydroxyapatite (9.5 um) and between 6.0 and 7.5 um

Manfred Ostertag, Rudolf Walker, Heiner Weber, Lex van der Meer, Jim McKinley, Norman Tolk, Benedikt Jean

Proceedings Volume 2672, (1996) https://doi.org/10.1117/12.238767

KEYWORDS: Laser ablation, Absorption, Free electron lasers, Pulsed laser operation, Scanning electron microscopy, Teeth, Collagen, Plasma, Tissues, Reflectivity

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Proceedings Article | 19 November 1993 Paper

Heterojunction band discontinuities measured by free-electron laser internal photoemission

Carlo Coluzza, J. Almeida, E. Tuncel, Jean Staehli, P. Baudat, Giorgio Margaritondo, Jim McKinley, Akira Ueda, Alan Barnes, Royal Albridge, Norman Tolk, D. Martin, Francois Morier-Genoud, C. Dupuy, Alok Rudra, Marc Ilegems

Proceedings Volume 1985, (1993) https://doi.org/10.1117/12.162743

KEYWORDS: Free electron lasers, Heterojunctions, Interfaces, Optical pumping, Semiconductors

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Proceedings Article | 14 July 1993 Paper

Excitation spectroscopy of thin-film disordered semiconductors

S. Gu, P. Craig Taylor, Jim McKinley, Akira Ueda, X. Yang, Norman Tolk

Proceedings Volume 1854, (1993) https://doi.org/10.1117/12.148030

KEYWORDS: Free electron lasers, Semiconductors, Absorption, Thin films, Spectroscopy, Photons, Amorphous semiconductors, Silicon, Indium arsenide, Luminescence

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Proceedings Article | 14 July 1993 Paper

Semiconductor spectroscopy and ablation processes with the Vanderbilt University FEL

Norman Tolk, Royal Albridge, Alan Barnes, Jim McKinley, H. Nielsen, Akira Ueda, J. Smith, Jeffrey Davidson, M. Languell, Carlo Coluzza, E. Tuncel, Giorgio Margaritondo

Proceedings Volume 1854, (1993) https://doi.org/10.1117/12.148046

KEYWORDS: Free electron lasers, Diamond, Gallium arsenide, Heterojunctions, Interfaces, Semiconductors, Spectroscopy, Particles, Laser damage threshold, Electrons

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Proceedings Article | 24 June 1993 Paper

Research at the SUMMA International Research Institute radiation test facility

Richard Nelson, Royal Albridge, Alan Barnes, Frank Carroll, Norman Tolk, Eleonora Witteles

Proceedings Volume 1848, (1993) https://doi.org/10.1117/12.147415

KEYWORDS: Free electron lasers, Laser induced damage, X-rays, Infrared radiation, Visible radiation, Nonlinear crystals, Ultraviolet radiation, Radiation effects, Gamma radiation, Femtosecond phenomena

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Proceedings Article | 11 January 1993 Paper

Nuclear-radiation-induced fluorescence effects in surface overlayers

Norman Tolk, M. Albert, Royal Albridge, Alan Barnes, D. Brown, G. Mensing, George Pollock

Proceedings Volume 1761, (1993) https://doi.org/10.1117/12.138917

KEYWORDS: Electrons, Luminescence, Photons, Calibration, Temperature metrology, Absorption, Phonons, Optical components, Sensors, Scattering

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Proceedings Article | 11 January 1993 Paper

Low-energy sputtering yield measurements of O+, O2+, N+, and N2+ incident on Al and Al2O3 surfaces

Samuel Espy, I. Urazgil'din, Alan Barnes, Y. Yao, J. Allen, Royal Albridge, Norman Tolk

Proceedings Volume 1761, (1993) https://doi.org/10.1117/12.138921

KEYWORDS: Aluminum, Oxygen, Ions, Sputter deposition, Crystals, Argon, Chemical species, Quartz, Nitrogen, Ion beams

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Proceedings Article | 1 December 1991 Paper

Vanderbilt Free-Electron Laser Center for Biomedical and Materials Research

Norman Tolk, Charles Brau, Glenn Edwards, Giorgio Margaritondo, Jim McKinley

Proceedings Volume 1552, (1991) https://doi.org/10.1117/12.50587

KEYWORDS: Free electron lasers, X-rays, Laser tissue interaction, Molecules, Biomedical optics, Medical research, Physics, Laser therapeutics, Semiconductors, Photons

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Proceedings Article | 1 November 1990 Paper

Role of low-energy neutral N2 beam-surface interactions leading to spacecraft glow

Alan Barnes, Royal Albridge, Jining Qi, Manfred Riehl-Chudoba, C. Sun, Paul Wang, Norman Tolk

Proceedings Volume 1329, (1990) https://doi.org/10.1117/12.22617

KEYWORDS: Ions, Particles, Molecules, Magnesium, Space operations, Chemical species, Magnesium fluoride, Excitons, Optical testing, Oxygen

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Showing 5 of 19 publications

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