Dr. Martin Letz Profile

Dr. Martin Letz

Senior Scientist at SCHOTT AG

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Author

Publications (15)

Proceedings Article | 31 December 2009 Paper

Influence of Na-related defects on DUV nonlinear absorption in CaF2: nanosecond versus femtosecond laser pulses

Ch. Mühlig, H. Stafast, W. Triebel, Th. Zeuner, Ch. Karras, M. Letz

Proceedings Volume 7504, 75040I (2009) https://doi.org/10.1117/12.836354

KEYWORDS: Absorption, Sodium, Pulsed laser operation, Luminescence, Femtosecond phenomena, Solar thermal energy, Fine needle aspiration, Annealing, Deep ultraviolet, Excitons

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Proceedings Article | 31 December 2009 Paper

A microscopic model for long-term laser damage in calcium fluoride

Stephan Rix, Ute Natura, Martin Letz, Claudia Felser, Lutz Parthier

Proceedings Volume 7504, 75040J (2009) https://doi.org/10.1117/12.836404

KEYWORDS: Diffusion, Calcium, Ions, Laser induced damage, Crystals, Phonons, Fluorine, Deep ultraviolet, Silver, Laser irradiation

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Proceedings Article | 31 December 2009 Paper

Study of haze in 193nm high dose irradiated CaF2 crystals

Ute Natura, Stephan Rix, Martin Letz, Lutz Parthier

Proceedings Volume 7504, 75041P (2009) https://doi.org/10.1117/12.836409

KEYWORDS: Laser scattering, Scattering, Absorption, Refractive index, Annealing, Mie scattering, Air contamination, Crystals, Calcium, Laser crystals

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Proceedings Article | 26 March 2007 Paper

Investigations regarding the prevention of depolarization of ArF excimer laser irradiation by CaF₂ laser optics

Ute Natura, Dietmar Keutel, Martin Letz, Lutz Parthier, Konrad Knapp

Proceedings Volume 6520, 652030 (2007) https://doi.org/10.1117/12.712108

KEYWORDS: Polarization, Crystals, Temperature metrology, Laser crystals, Excimer lasers, Laser optics, Birefringence, Calcium, Laser irradiation, Optical properties

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Proceedings Article | 13 February 2007 Paper

Reference-based optical characterization of glass-ceramic converter for high-power white LEDs

A. Engel, M. Letz, T. Zachau, E. Pawlowski, K. Seneschal-Merz, T. Korb, D. Enseling, B. Hoppe, U. Peuchert, J. Hayden

Proceedings Volume 6486, 64860Y (2007) https://doi.org/10.1117/12.705334

KEYWORDS: Glasses, Scattering, Ceramics, Luminescence, Crystals, Light scattering, YAG lasers, Cerium, Light emitting diodes, Absorption

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Fluorescence techniques are known for their high sensitivity and are widely used as analytical tools and detection methods for product and process control, material sciences, environmental and bio-technical analysis, molecular genetics, cell biology, medical diagnostics and drug screening. According to DIN/ISO 17025 certified standards are used for fluorescence diagnostics having the drawback of giving relative values for fluorescence intensities only. Therefore reference materials for a quantitative characterization have to be related directly to the materials under investigation. In order to evaluate these figures it is necessary to calculate absolute numbers like absorption/excitation cross section and quantum yield. This can be done for different types of dopants in different materials like glass, glass ceramics, crystals or nano crystalline material embedded in polymer matrices. Here we consider a special type of glass ceramic with Ce doped YAG as the main crystalline phase. This material has been developed for the generation of white light realized by a blue 460 nm semiconductor transition using a yellow phosphor or converter material respectively. Our glass ceramic is a pure solid state solution for a yellow phosphor. For the production of such a kind of material a well controlled thermal treatment is employed to transfer the original glass into a glass ceramic with a specific crystalline phase. In our material Ce doped YAG crystallites of a size of several µm are embedded in a matrix of a residual glass. We present chemical, structural and spectroscopic properties of our material. Based on this we will discuss design options for white LED's with respect to heat management, scattering regime, reflection losses, chemical durability and stability against blue and UV radiation, which evolve from our recently developed material. In this paper we present first results on our approaches to evaluate quantum yield and light output. Used diagnostics are fluorescence (steady state, decay time) and absorption (remission, absorption) spectroscopy working in different temperature regimes (10 - 350 K) of the measured samples in order to get a microscopic view of the relevant physical processes and to prove the correctness of the obtained data.

Proceedings Article | 21 February 2005 Paper

Analysis of laser durability of CaF2 for optical lithography

Guenter Grabosch, Lutz Parthier, Ute Natura, Karin Poehl, Martin Letz, Christian Muehlig, Konrad Knapp

Proceedings Volume 5647, (2005) https://doi.org/10.1117/12.585247

KEYWORDS: Optical lithography, Silver, Lithography, Semiconductors, Semiconductor lasers, Laser applications, Lenses, Immersion lithography, Laser induced damage, Biological research

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Proceedings Article | 14 October 2004 Paper

High-accuracy VUV reflectometry at selectable sample temperatures

Alexander Gottwald, Udo Kroth, Martin Letz, Hendrik Schoppe, Mathias Richter

Proceedings Volume 5538, (2004) https://doi.org/10.1117/12.556301

KEYWORDS: Reflectometry, Temperature metrology, Reflectivity, Crystals, Excitons, Sensors, Vacuum ultraviolet, Absorption, Synchrotron radiation, Anisotropy

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SPIE Journal Paper | 1 October 2004

Liquid immersion lithography using water as an immersion liquid: role of orientation contributions to light scattering at 193 nm

Martin Letz, Konrad Knapp

JM3, Vol. 3, Issue 04, (October 2004) https://doi.org/10.1117/12.10.1117/1.1794179

KEYWORDS: Scattering, Light scattering, Liquids, Polarizability, Polarization, Raman scattering, Molecules, Immersion lithography, Rayleigh scattering, Microfluidics

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Proceedings Article | 28 May 2004 Paper

CaF2 for DUV lens fabrication: basic material properties and dynamic light-matter interaction

Martin Letz, Axel Engel, Wolfgang Mannstadt, Lutz Parthier, Ute Natura, Konrad Knapp

Proceedings Volume 5377, (2004) https://doi.org/10.1117/12.536666

KEYWORDS: Ions, Crystals, Absorption, Deep ultraviolet, Distortion, Electron holes, Optical properties, Chemical species, Glasses, Temperature metrology

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Proceedings Article | 28 May 2004 Paper

Liquid immersion lithography: microscopic polarizabilities and the role of orientation contributions to light scattering

Martin Letz, Konrad Knapp

Proceedings Volume 5377, (2004) https://doi.org/10.1117/12.547886

KEYWORDS: Scattering, Light scattering, Polarizability, Molecules, Raman scattering, Liquids, Microfluidics, Polarization, Water, Immersion lithography

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Proceedings Article | 28 May 2004 Paper

Excimer-laser-induced defect generation in Lithosil

Ute Natura, Oliver Sohr, Martin Letz, Rolf Martin, Michael Kahlke, Gabriele Fasold

Proceedings Volume 5377, (2004) https://doi.org/10.1117/12.531653

KEYWORDS: Hydrogen, Excimer lasers, Silica, Absorption, Silicon, Data modeling, Statistical modeling, Optical lithography, Raman spectroscopy, Systems modeling

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Proceedings Article | 26 June 2003 Paper

Optical anisotropy in the cubic crystal of CaF2: scaling arguments and their relation to dispersing absorption

Martin Letz, A. Gottwald, M. Richter, Matthias Brinkmann, G. Wehrhan, Lutz Parthier

Proceedings Volume 5040, (2003) https://doi.org/10.1117/12.485467

KEYWORDS: Anisotropy, Crystals, Excitons, Absorption, Dielectrics, Dispersion, Crystal optics, Electromagnetic radiation, Deep ultraviolet, Birefringence

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Proceedings Article | 17 June 2003 Paper

New heavy metal oxide silicate amplifier glass for compact and broadband amplifiers

F. Bullesfeld, Bernd Drapp, V. Hagemann, Martin Letz, Ulrich Peuchert, S. Reichel, Ruediger Sprengard, Tobias Kaelber, Matthias Brinkmann, B. Schreder, E. Pawlowski, S. Pucilowski, Joseph Hayden

Proceedings Volume 4990, (2003) https://doi.org/10.1117/12.479379

KEYWORDS: Glasses, Oxides, Metals, Silicate glass, Optical amplifiers, Erbium, Absorption, Planar waveguides, Fiber amplifiers, Silica

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SPIE Journal Paper | 1 April 2003

Short wavelength optical anisotropy in CaF₂ caused by exciton dispersion

Martin Letz, W. Mannstadt, Matthias Brinkmann, Lutz Parthier, G. Wehrhan, Ewald Moersen

JM3, Vol. 2, Issue 02, (April 2003) https://doi.org/10.1117/12.10.1117/1.1563262

KEYWORDS: Dielectrics, Anisotropy, Crystals, Absorption, Excitons, Birefringence, Electrons, Geometrical optics, Crystal optics, Dielectric polarization

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Proceedings Article | 30 July 2002 Paper

Spatial dispersion in CaF2 caused by the vicinity of an excitonic bound state

Martin Letz, W. Mannstadt, Matthias Brinkmann, Ewald Moersen

Proceedings Volume 4691, (2002) https://doi.org/10.1117/12.474572

KEYWORDS: Dielectrics, Crystals, Particles, Excitons, Dielectric polarization, Anisotropy, Birefringence, Electron holes, Refractive index, Geometrical optics

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Showing 5 of 15 publications

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