Prof. Ernst Wintner Profile

Prof. Ernst Wintner

at Technische Univ Wien

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Author

Publications (16)

SPIE Journal Paper | 30 May 2014

Effect of laser pulse energy on the laser ignition of compressed natural gas fueled engine

Dhananjay Srivastava, Ernst Wintner, Avinash Agarwal

OE, Vol. 53, Issue 05, 056120, (May 2014) https://doi.org/10.1117/12.10.1117/1.OE.53.5.056120

KEYWORDS: Pulsed laser operation, Laser energy, Combustion, Plasma, Laser stabilization, Electrodes, Laser systems engineering, Laser beam propagation, Optical engineering, Laser applications

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Proceedings Article | 28 November 2013 Paper

Laser plasma ignition: status, perspectives, solutions

E. Wintner, H. Kofler, D. Srivastava, A. Agarwal

Proceedings Volume 9065, 90650B (2013) https://doi.org/10.1117/12.2053152

KEYWORDS: Vertical cavity surface emitting lasers, Semiconductor lasers, Diodes, Solid state lighting, Lithium, Plasma, Nd:YAG lasers, Crystals, Pulsed laser operation, Laser resonators

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Proceedings Article | 15 May 2012 Paper

VCSELs with two-sided beam emission for pressure sensor applications

Balthasar Fischer, Andreas Strodl, Alexander Hein, Ernst Wintner, Rainer Michalzik

Proceedings Volume 8432, 843206 (2012) https://doi.org/10.1117/12.922486

KEYWORDS: Vertical cavity surface emitting lasers, Sensors, Fabry–Perot interferometers, Antireflective coatings, Gallium arsenide, Polarization, Reflectivity, Quantum wells, Semiconductor lasers, Beam splitters

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SPIE Journal Paper | 1 October 2007

Laser cleaning of optical windows in internal combustion engines

Helmut Ranner, Pratush Tewari, Heinrich Kofler, M. Lackner, Ernst Wintner, Avinash Agarwal, F. Winter

OE, Vol. 46, Issue 10, 104301, (October 2007) https://doi.org/10.1117/12.10.1117/1.2793704

KEYWORDS: Combustion, Laser optics, Laser ablation, Pulsed laser operation, Carbon, Aluminum, Optical engineering, Nd:YAG lasers, Photomicroscopy

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Proceedings Article | 13 July 2007 Paper

Ultrashort pulse laser processing of hard tissue, dental restoration materials, and biocompatibles

A. Yousif, M. Strassl, F. Beer, L. Verhagen, M. Wittschier, E. Wintner

Proceedings Volume 6632, 663203 (2007) https://doi.org/10.1117/12.728616

KEYWORDS: Bone, Tissues, Laser ablation, Semiconductor lasers, Laser tissue interaction, Laser therapeutics, Temperature metrology, Teeth, Composites, Pulsed laser operation

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Proceedings Article | 25 April 2007 Paper

Novel oral laser applications

A. Yousif, M. Strassl, F. Beer, L. Verhagen, M. Wittschier, E. Wintner

Proceedings Volume 6606, 66061C (2007) https://doi.org/10.1117/12.729516

KEYWORDS: Laser ablation, Pulsed laser operation, Laser applications, Natural surfaces, Semiconductor lasers, Laser tissue interaction, Tissues, Gas lasers, Bone, Laser dentistry

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Proceedings Article | 13 March 2007 Paper

Novel oral applications of ultra-short laser pulses

V. Wieger, J. Wernisch, E. Wintner

Proceedings Volume 6460, 64600B (2007) https://doi.org/10.1117/12.706838

KEYWORDS: Laser ablation, Pulsed laser operation, Composites, Erbium lasers, Tissues, Picosecond phenomena, Laser dentistry, Bone, Laser systems engineering, Laser applications

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In the past decades, many efforts have been made to replace mechanical tools in oral applications by various laser systems. The reasons therefore are manifold: i) Friction causes high temperatures damaging adjacent tissue. ii) Smear layers and rough surfaces are produced. iii) Size and shape of traditional tools are often unsuitable for geometrically complicated incisions and for minimum invasive treatment. iv) Mechanical damage of the remaining tissue occurs. v) Online diagnosis for feedback is not available. Different laser systems in the µs and sub-&mrg;s-pulse regime, among them Erbium lasers, have been tested in the hope to overcome the mentioned drawbacks and, to some extent, they represent the current state of the art with respect to commercial and hence practical application. In the present work the applicability of scanned ultrashort pulse lasers (USPLs) for biological hard tissue as well as dental restoration material removal was tested. It is shown that cavities with features superior to mechanically treated or Erbium laser ablated cavities can be generated if appropriate scan algorithms and optimum laser parameters are matched. Smooth cavity rims, no microcracks, melting or carbonisation and precise geometry are the advantages of scanned USLP ablation. For bone treatment better healing conditions are expected as the natural structure remains unaffected by the preparation procedure. The novelty of this work is represented by a comprehensive compilation of various experimental results intended to assess the performance of USPLs. In this context, various pulse durations in the picosecond and femtosecond regime were applied to dental and bone tissue as well as dental restoration materials which is considered to be indispensable for a complete assessment. Parameters like ablation rates describing the efficiency of the ablation process, and ablation thresholds were determined - some of them for the first time - and compared to the corresponding Erbium values. The morphology of the tissue surfaces remaining after laser preparation was investigated and the surface roughness was evaluateded. Selective ablation was stressed and the temperature impact induced by USPLs was analyzed. Due to the limited space only a selection of results can be presented.

Proceedings Article | 10 June 2006 Paper

Ultra-short laser pulses in dentistry: a solution toward painless dental treatment?

V. Wieger, A. Yousif, M. Strassl, E. Wintner

Proceedings Volume 6344, 634403 (2006) https://doi.org/10.1117/12.693398

KEYWORDS: Laser ablation, Laser dentistry, Composites, Pulsed laser operation, Laser tissue interaction, Tissues, Erbium lasers, Dentistry, Picosecond phenomena, Erbium

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Proceedings Article | 9 June 2006 Paper

Laser ignition of engines: a realistic option!

M. Weinrotter, D. Srivastava, K. Iskra, J. Graf, H. Kopecek, J. Klausner, G. Herdin, E. Wintner

Proceedings Volume 6053, 605316 (2006) https://doi.org/10.1117/12.660458

KEYWORDS: Combustion, Plasmas, Nd:YAG lasers, Laser energy, Laser systems engineering, Q switched lasers, Pulsed laser operation, Laser development, Diode pumped solid state lasers, Methane

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Proceedings Article | 7 June 2006 Paper

Oral applications of ultra-short laser pulses: a new approach for gentle and painless treatment?

A. Yousif, M. Strassl, V. Wieger, S. Zoppel, E. Wintner

Proceedings Volume 6261, 62611M (2006) https://doi.org/10.1117/12.686370

KEYWORDS: Laser ablation, Laser tissue interaction, Bone, Titanium, Laser dentistry, Tissues, Natural surfaces, Composites, Cartilage, Laser applications

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Proceedings Article | 7 June 2005 Paper

Laser ignition of engines: multipoint, fiber delivery, and diagnostics

M. Weinrotter, K. Iskra, A. Al-Janabi, H. Kopecek, E. Wintner

Proceedings Volume 5850, (2005) https://doi.org/10.1117/12.633674

KEYWORDS: Combustion, Plasma, Hydrogen, Laser energy, Pulsed laser operation, Fiber lasers, Nd:YAG lasers, Diagnostics, Laser systems engineering, Methane

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Proceedings Article | 15 July 2004 Paper

Laser-induced ignition characteristics of methane- and hydrogen-air mixtures at high pressures

Herbert Kopecek, M. Weinrotter, S. Charareh, F. Winter, Ernst Wintner

Proceedings Volume 5506, (2004) https://doi.org/10.1117/12.580026

KEYWORDS: Pulsed laser operation, Methane, Laser energy, Combustion, Hydrogen, Plasma, Laser systems engineering, Nd:YAG lasers, Pulse shaping, Gas lasers

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Proceedings Article | 14 November 2003 Paper

Laser ignition of methane-air mixtures at high pressures and optical diagnostics

Herbert Kopecek, M. Lackner, Kurt Iskra, Ch. Forsich, D. Rüdisser, Theo Neger, F. Winter, Ernst Wintner

Proceedings Volume 5147, (2003) https://doi.org/10.1117/12.543678

KEYWORDS: Combustion, Semiconductor lasers, Pulsed laser operation, Absorption, Plasma, Signal detection, Laser induced fluorescence, Methane, Laser energy, Nd:YAG lasers

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Proceedings Article | 29 May 2002 Paper

Ultrashort pulse solid-state lasers and modern applications

Ernst Wintner

Proceedings Volume 4752, (2002) https://doi.org/10.1117/12.469095

KEYWORDS: Pulsed laser operation, Mode locking, Solid state lasers, Femtosecond phenomena, Mirrors, Diode pumped solid state lasers, Semiconductor lasers, Oscillators, Resonators, Laser applications

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Proceedings Article | 11 October 2001 Paper

Optical filtering device using counterpropagating difference frequency generation

Yi-qiang Qin, Ernst Wintner

Proceedings Volume 4604, (2001) https://doi.org/10.1117/12.444620

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Proceedings Article | 5 March 1999 Paper

Femtosecond Cr:LiSGaF and Cr:LiSAF lasers: phenomena and limitations in the 15-fs regime

Irina Sorokina, E. Sorokin, Ernst Wintner

Proceedings Volume 3735, (1999) https://doi.org/10.1117/12.341450

KEYWORDS: Raman spectroscopy, Crystals, Laser crystals, Pulsed laser operation, Mirrors, Mode locking, Solitons, Femtosecond phenomena, Sapphire, Raman scattering

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Showing 5 of 16 publications

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