ll▷ Joachim Hein gesucht? Richtige Adressen und Telefonnummern finden! 57 Einträge zu Joachim Hein mit aktuellen Kontaktdaten. Room Institut für Optik und Quantenelektronik Friedrich-Schiller-Universität Jena Max-Wien-Platz 1 Jena. Publications by Dr. Joachim Hein. Member. Gründung des Architekturbüros Hein in Herford; Eintritt von Joachim Hein in das Büro als freier Mitarbeiter; Partnerschaft zwischen Reinhard.
Hans-Joachim HeinHe is responsible as Head of Investment Analysis and Controlling, covering Performance Analysis, the Risk Control Function and the. DataWarehouse of Union. Dr. Joachim Hein. Max-Wien-Platz 1, Raum Jena. Sprechzeiten: nach Vereinbarung. Telefon: +49 Fax: +49 E-Mail. Hauptinhalt. Dipl. Ing. Joachim Hein. Dipl. Ing. Joachim Hein. Foto von Dipl. Ing. Joachim Hein E-Mail senden. lexingtonfilm.comldt at lexingtonfilm.com
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Registrieren Betnspin Sie noch keine Skat.Com Konto Joachim Hein sollten)? - TransferhistorieIn den Kategorien Arbeitskraftabsicherung und Altersvorsorge ging jeweils Lotto Euromillionen der Trophäen an die Continentale. For this purpose, absorption and fluorescence spectra were measured using a setup optimized to reduce the effect of radiation trapping. The model describes both the generation and the amplification of the Euroltto spontaneous emission for each type of laser amplifier. Filed: August 20, GräfF.
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Create an account. Proceedings Article 26 April Highly efficient, cryogenically cooled Yb:YAG q-switch laser based on a gain modulated unstable resonator design.
We present a novel approach to combine diode-pumped, moderately low-gain media with the advantages of an unstable cavity.
To this end, we propose to utilize a spatially tailored gain profile in the active medium instead of using a graded reflectivity mirror to provide an eeffective shaping mechanism for the intra-cavity intensity distribution.
The required gain profile can be easily generated with a state-of-the-art homogenized laser diode pump beam in an end-pumped configuration.
Diode-pumped cryogenic Tm:LiYF4 laser. We present the absorption spectroscopy and continuous-wave laser operation of Tm:YLF at cryogenic temperatures.
At K, a maximum output power of 2. The output laser wavelength is centered at nm for Elc. Proceedings Article 9 June Optical pumping of laser materials is an effective way to create a population inversion necessary for laser operation.
However, a fraction of the pump energy is always transfered as heat into the laser material, which is mainly caused by the quantum defect.
Due to the low heat introduction, high optical-to-optical efficiency and high repetition rate laser systems based on diode-pumping are well-suited for a number of applications.
Here, however, laser beam quality is of crucial importance. Phase distortions and beam profile modulations can lead to optical damages as well as a significant reduction of the focal spot intensity.
Pump-induced phase aberrations are the main cause for phase distortions of the amplified laser beam. However, the spatially dependent distribution of the population inversion itself also leads to spatial phase aberrations.
Since electron excitation directly leads to a change in the charge distribution of the laser active ions, the dynamic response of the material to external fields changes.
We show the first comprehensive spatio-temporal characterization of the pump-induced phase aberration including both effects.
We found that both phase effects significantly contribute to the overall phase distortions. Since the temporal characteristic of the electronic phase depends on the fluorescence lifetime and the thermal phase on the thermal diffusivity, both phase effects could be distinguished by their different lifetimes.
Proceedings Article 11 May Temperature dependent spectroscopic characterization of Tm:YAG crystals as potential laser medium for pulsed high energy laser amplifiers.
Similar to ytterbium doped laser materials laser operation with thulium doped media is possible within a quasi-three level scheme, which especially for pulse pumped lasers is a drawback for efficient laser operation, as a significant amount of energy is required to bleach out the laser medium.
Since this energy cannot be extracted, it is lost for the amplification process. Hence, operation of such lasers at cryogenic temperatures seems to be an appropriate solution.
For further modeling and derivation of design rules for future laser systems based on such a scheme reliable spectral data is needed.
We will present absorption and emission measurements on Tm:YAG as a function of temperature in the range from 80 K to K covering both the absorption bands around nm and the emission bands up to 2.
The spectral measurements were carried out on two samples of Tm:YAG with doping levels of 2 at.
Precautions for reabsorption effects were taken to allow for accurate results over the whole measurement range. From these measurements we have derived absorption and emission cross sections and radiative lifetimes.
By comparing the latter values to values obtained by highly accurate measurements of the lifetime using the pinhole method we could also estimate the quantum efficiency.
Proceedings Article 22 February Progress in joule-class diode laser bars and high brightness modules for application in long-pulse pumping of solid state amplifiers.
Crump , M. Karow , S. Knigge , A. Tränkle , J. Lotz , W. Fassbender , J. Neukum , J. Körner , R. Bödefeld , J. Progress in the development of highly brilliant pump modules based on novel high-energy-class diode laser bars is presented, targeting long-pulse 2 ms application in pumping Yb:CaF 2 amplifier crystals.
Bars with long resonators and high fill factors are used for low resistance and efficient cooling. Advanced extreme-double asymmetric epitaxial structures are used for high efficiency at high power.
Facet passivation is used for long life at high powers, enabling operation at W per bar 1. Performance of bars and passively cooled stacks is summarized and prospects for further performance enhancements are reviewed.
Proceedings Article 12 May To generate comprehensive datasets for emission and absorption cross sections, the spectral properties of the materials were recorded at temperatures ranging from liquid nitrogen to room temperature.
It was found that the newly developed materials offer higher emission cross sections at the center laser wavelength of nm than the so far used alternatives Yb:CaF 2 and Yb:FP-glass.
This results in a lower saturation fluence that offers the potential for higher laser extraction efficiency. Fluorescence lifetime quenching of first test samples was analyzed and attributed to the hydroxide OH concentration in the host material.
Applying a sophisticated glass manufacturing process, OH concentrations could be lowered by up to two orders of magnitude, rising the lifetime and the quantum efficiency for samples doped with more than 6.
First laser experiments showed a broad tuning range of about 60 nm, which is superior to Yb:CaF 2 and Yb:FP-glass in the same setup. Furthermore, measurements of the laser induced damage threshold LIDT for different coating techniques on doped substrates revealed the appropriateness of the materials for short pulse high-energy laser amplification.
Proceedings Article 13 March Progress in high-energy-class diode laser pump sources. Crump , C. Frevert , Frank Bugge , S. Knigge , G. Erbert , G.
Tränkle , A. Pietrzak , R. Hein , T. A new generation of diode-pumped high-energy-class solid-state laser facilities is in development that generate multijoule pulse energies at around 10 Hz.
Currently deployed quasi-continuous-wave QCW diode lasers deliver average inpulse pump powers of around W per bar. Increased power-per-bar helps to reduce the system size, complexity and cost per Joule and the increased pump brilliance also enables more efficient operation of the solid state laser itself.
We review here the status of these high-energy-class pump sources, showing how the highest powers are enabled by using long resonators 4…6 mm for improved cooling and robustly passivated output facets for high reliability.
Results are presented for prototype passively-cooled single bar assemblies and monolithic stacked QCW arrays. Proceedings Article 31 October Mariastefania De Vido , P.
YAG as the host medium offers good thermo-mechanical and thermo-optical properties and, if it is used in ceramic form, it can be produced in large sizes with laser-grade optical properties.
Large sized, laser-grade gain media are pivotal for the development of high energy kJ-class laser systems. Much effort has been devoted to the development of advanced polishing and coating techniques in order to produce optical materials able to withstand high fluence levels at different environmental conditions.
Performance of IBS coatings improves as substrate roughness decreases, whereas performance of IAD coatings improves as substrate roughness increases.
No clear correlation has been observed between LIDT values and temperature or pressure. However, an inspection of damage sites allowed to conclude that both temperature and pressure have an impact on damage morphology.
Proceedings Article 7 May To obtain the emission cross-sections two theoretical approaches were used.
The first is the McCumber or reciprocity method RM which is based on the absorption spectra. The second is the Fuchtbauer-Ladenburg FL method using fluorescence spectra.
From the results of cross-sections one can expect significant impact on laser performance on these materials especially in the case of high energy class diode pumped solid state lasers.
Diode-pumped, cryogenically cooled, femtosecond burst mode laser. We present a novel approach for the construction of a high energy, high power burst mode laser system, based on diode pumped cryogenically cooled Yb:CaF 2.
The system consists of a frontend producing pulses of fs duration with 1 MHz. Bursts of subsequent pulses are cut from the continuous train by an electro optical modulator.
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