Dr. Matthias Esselbach Profile

Dr. Matthias Esselbach

Sales Representative at JENOPTIK Optical Systems GmbH

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Publications (8)

Proceedings Article | 14 May 2007 Paper

Fabrication and test of compact high aperture IR telescope lenses for airborne use

M. Esselbach, S. Franz, S. Belke, J. Taubert, H. Lauth, T. Weyh

Proceedings Volume 6542, 654226 (2007) https://doi.org/10.1117/12.718571

KEYWORDS: Modulation transfer functions, Infrared telescopes, Lenses, Optics manufacturing, Infrared imaging, Polishing, Optical components, Laser development, Infrared lenses, Wavefronts

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Proceedings Article | 14 May 2007 Paper

IR optics for defense, security, and civil applications from JENOPTIK

Matthias Esselbach, Thomas Weyh, Stefan Müller-Pfeiffer, Oliver Falkenstörfer, Wolfgang Seiferth, Hans Lauth

Proceedings Volume 10316, 103161R (2007) https://doi.org/10.1117/12.720214

KEYWORDS: Optics manufacturing, Modulation transfer functions, Coating, Defense and security, Aspheric lenses, Polishing, Infrared imaging, Surface finishing, Optical components, Design for manufacturability

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Proceedings Article | 19 July 1999 Paper

Submillisecond pulses by two-wave coupling in Bi12TiO20 crystals

Matthias Esselbach, Gregor Cedilnik, Armin Kiessling, Richard Kowarschik

Proceedings Volume 3749, (1999) https://doi.org/10.1117/12.354743

KEYWORDS: Crystals, Two wave mixing, Crystallography, Switching, Electrodes, Helium neon lasers, Holography, Sensors, Signal detection, Beam splitters

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Proceedings Article | 19 July 1999 Paper

Photorefractive effects in long narrow BSO-crystals with applied electric field

Gregor Cedilnik, Matthias Esselbach, Armin Kiessling, Richard Kowarschik, Ervin Nippolainen, Alexei Kamshilin, Victor Prokofiev

Proceedings Volume 3749, (1999) https://doi.org/10.1117/12.354867

KEYWORDS: Crystals, Photorefraction, Diffraction gratings, Picosecond phenomena, Holograms, Electron transport, Absorption, Polonium, Particle swarm optimization, Spatial frequencies

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Proceedings Article | 19 July 1999 Paper

Information storage with a barium-calcium titanate crystal

Matthias Esselbach, Armin Kiessling, Richard Kowarschik

Proceedings Volume 3749, (1999) https://doi.org/10.1117/12.354831

KEYWORDS: Crystals, Data storage, Ferroelectric materials, Crystal optics, Refractive index, Process modeling, Optical storage, Calcium, Electro optics, Polishing

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Barium-calcium titanate is a novel photorefractive crystal for optical storage applications. It is grown from a congruently melting composition from BaTiO3 and CaTiO3. In contrast to pure BaTiO3 the melting temperature is with I 592 °C nearly 30 ° deeper, the crystal is cubic at the growth temperature and shows a phase transition to the tetragonal structure at 98°C. It means that as in BaTiO3 a spontaneous poling appears. The lattice constants are smaller than in BaTiO3, a =b = 3.962 nm and c =3.999 nm and decreace with increasing Ca content. Therefore, the crystal is an optical uniaxial one. Asecond phase transition like in BaTiO3 is not found /1/. The refractive indices are slightly smaller than those of BaTiO3 but the electrooptic coefficients r13 =36 pm/V and r33 = 140 pm/V are larger (2 = 514 nm) /2/. Therefore, the BaiCaTiO3-crystal is a very promising material for optical information storage. In our experiments we used a 1 cm 1 cm 1 cm large crystal, poled in an external electric field, therfore obtaining a single domain sample. All sides are polished to optical quality. The sample shows in ordinarily polarized light extremly high fanning effects. We have studied the two wave mixing (TWM) for ordinary and extraordinary polarized light (A =514 nm). As expected, with extraordinary polarized light the buildup time is much longer (about 10 s) than with ordinarily polarized light (5 s), but the reached gain for a given intensity ratio between pump wave and signal wave is 2 orders higher. Varying the intensity ratio the logaritmic dependence of the gain on the intensity ratio is nearly linear. (The maximum value reached in our experiments is 4.6, it means the signal intensity behind the crystal is 40 000 times higher than the incident signal intensity). Very interesting is the behavior that the amplification will allways reach a maximum absolute value - nearly 3% of the pump wave is coupled to the signal wave. Reading the refractive index grating in the crystal after switching off the signal wave, a typical temporal behavior ofthe reconstructed signal wave is observed. This behavior can be explained with a multi level model ofthe photorefractive process inside the crystal /3, 4, 5/ The information will be recorded over a very long time interval, and multiple storage (for example via angular coding) is possible.

Proceedings Article | 18 September 1996 Paper

Photorefractive novelty filters for transient phase evaluation

Henning Rehn, Matthias Esselbach, Richard Kowarschik, Klaus Ringhofer

Proceedings Volume 2782, (1996) https://doi.org/10.1117/12.250805

KEYWORDS: Optical filters, Phase measurement, Ferroelectric materials, Crystals, Two wave mixing, Phase conjugation, Visualization, Phase transfer function, Interferometry, Phase interferometry

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Proceedings Article | 18 September 1996 Paper

Stationary and transient interferometry with a self-pumped phase conjugate mirror

Henning Rehn, Gunther Notni, A. Krause, Burkhard Fleck, Armin Kiessling, Matthias Esselbach, Richard Kowarschik, Lutz Wenke

Proceedings Volume 2782, (1996) https://doi.org/10.1117/12.250806

KEYWORDS: Phase conjugation, Interferometry, Mirrors

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Proceedings Article | 1 September 1996 Paper

Optical storage of information via refreshing by inverse seeding (OSIRIS)

M. Esselbach

Proceedings Volume 2778, 2778CS (1996) https://doi.org/10.1117/12.2316149

KEYWORDS: Crystals, Optical storage, Data storage, Phase conjugation, Camera shutters, Nonlinear crystals, Reflectivity, Switching, Diffraction gratings

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