Joachim Hein ➤ ehemaliger Fußballspieler aus Deutschland ➤ Mittelfeld ➤ zuletzt bei TuS Celle FC ➤ * in. Room Institut für Optik und Quantenelektronik Friedrich-Schiller-Universität Jena Max-Wien-Platz 1 Jena. Publications by Dr. Joachim Hein. Member. Joachim Hein (* 4. Juli in Neisse, Provinz Schlesien; † 5. Mai in Sierksdorf) war ein deutscher Internist und Hochschullehrer in Kiel.
hein architektenJoachim Hein. Schulstr. 12a Wadern. Telefon: ; Fax: ; E-Mail: [email protected] Kontaktformular öffnen. Dr. phil. Joachim von Hein wurde in Hamburg-Wandsbek geboren und ist in St. Andreasberg im Oberharz aufgewachsen und zur Schule gegangen. Joachim Hein – Architekt und Innenarchitekt – wurde in Neuss geboren und lebt in Düsseldorf, studierte in Kaiserslautern, Düsseldorf sowie Dessau an.
Joachim Hein Dr. Joachim von Hein VideoSingularities of Kahler-Einstein Metrics and Complete Calabi-Yau Manifolds
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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.
Afterwards the duration of the individual pulses is stretched to 50 ps. The amplifier system consists of two amplifiers.
Both amplifiers utilize mirror based relay imaging schemes to allow for a sufficient number of extraction passes for achieving efficient energy extraction.
The goal parameters of the system are to achieve a total energy of 5J per burst with a repetition rate of 10Hz. Amplification results for the first of two amplifiers are demonstrated.
Single pulse energies of up to 7. To achieve a constant energy from pulse to pulse during the burst we present a technique based on the modulation of the laser diode current during one pulse.
Keppler , C. Wandt , M. Hornung , R. Bödefeld , A. Kessler , A. Sävert , M. Hellwing , F. Schorcht , J. Hein , M. Advanced high intensity laser matter interaction experiments always call for optimized laser performance.
In order to further enhance the POLARIS laser system, operational at the University of Jena and the Helmholtz-Institute Jena, in particular its energy, bandwidth and focusability, new amplifier technologies have been developed and are reported here.
Additionally, existing sections were considerably improved. A new multi-pass amplification stage, which is able to replace two currently used ones, was developed in close collaboration with the MPQ Garching.
The new basic elements of this amplifier are well homogenized pump modules and the application of a successive imaging principle. By operating the amplifier under vacuum conditions a top hat beam profile with an output energy of up to 1.
The already implemented POLARIS amplifier A4 was further improved by adapting an advanced method for the homogenization of the multi-spot composed pump profile.
The new method comprises a computer-based evolutionary algorithm which optimizes the position of the different spots regarding its individual size, shape and intensity.
Proceedings Article 18 February HiLASE cryogenically-cooled diode-pumped laser prototype for inertial fusion energy.
Results of detailed energetics and thermo-optical modeling confirm the viability of cryogenic helium-gas cooling approach to drastically reduce thermally-induced distortions in the laser slabs.
In addition, a comparison of spectral measurements from laser-diode stacks and Yb:YAG crystals validates the feasibility of highly efficient diode-pumped solid-state lasers at cryogenic temperatures.
The optical quality and the laser damage threshold are influenced by the purity and the real structure of the crystal. Both properties strongly depend on raw material quality and growth conditions.
Production of pure CaF 2 single crystals and their characterization are described. The advantage of higher volume is a better homogeneity of the dopant concentration and the diffractive index in the crystal.
Critical mechanical properties especially of the doped fluoride have to be taken into account. The growth process has to be adopted carefully to avoid stress, cracks and other crystal defects.
Data of refractive index homogeneity and stress birefringence are presented. A comparison of doped and undoped crystals is made and an outlook for further improvement is given.
The segregation coefficient of the dopant which is important to be near to one is reported. Differences between top and bottom of the crystal are shown.
Results of the real structure evaluation are presented. The most critical feature for high energy applications which are strength and concentration of small angle grain boundaries are compared with that of undoped crystals.
Körner , J. Kahle , H. Liebetrau , M. Lenski , M. Kaluza , M. Loeser , M. For laser performance simulations, optical properties of applied active materials have to be exactly known.
The temperature of the samples was aligned in steps of 20 K between K and room temperature with a liquid nitrogen driven cryostat.
Absorption spectra were obtained with a fiber coupled white light source and fluorescence spectra by excitation with a fiber coupled 10W laser diode at nm.
All spectral measurements were performed with a scanning spectrum analyzer, providing a spectral resolution down to 0.
By applying the McCumber relation in combination with the Fuchtbauer-Ladenburg method, we were able to obtain a valid emission cross section over the whole range of interest from the measured data.
High-efficiency cyrogenic-cooled diode-pumped amplifier with relay imaging for nanosecond pulses. Siebold , M. The temperature of these materials was adjusted arbitrarily between K and K, while heat removal was realized by transverse cooling.
In order to obtain a good beam profile throughout the amplification process, we used an all-mirror based relay imaging setup consisting of a telescope accomplishing a 4f-imaging with a plane mirror in each image plane.
The amplification beam is then coupled into the cavity and doing several round trips wandering over the surface of the spherical mirrors.
Hence the laser material is placed in one of the image planes, the beam quality of the amplifier was ruled by the intensity profile of the pumping laser diodes consisting of two stacks with 2.
Due to the given damage threshold fluence, the output energy of the amplifier was limited to about 1J at a beam diameter of 4.
The seed pulses with a duration of 6 ns were generated in a Yb:FPglass cavity dumped oscillator with further amplification up to the mJ level by a room temperature Yb:YAG multi pass amplifier.
The 1 Hz repetition rate of the system was limited by the repetition rate of the front-end. With Yb:YAG for instance an output energy of 1.
Contrast improvement by prepulse suppression in cascaded amplifier cavities. We introduce a method to suppress prepulses of pulse picking systems due to the limited extinction ratio of polarization gating systems.
By matching the round trip times of the oscillator and the subsequent regenerative amplifiers, leaking pulses are hidden below the temporal intensity pedestal of the main pulse.
With this method, prepulses at the temporal position equal to the time difference of the round trip times of the cavities could be suppressed completely.
Körner , M. Liebetrau , R. Seifert , M. Lenski , S. Pastrik , J. Gottschall , J. Limpert , V. We report on a novel 10 mJ-level diode-pumped Yb:KYW amplifier at nm, which generates picosecond pulses at a repetition rate of 10 Hz.
It will be used in the front end of a petawatt laser system for pumping an optical parametric amplifier OPA for contrast enhancement.
For synchronization purposes the amplifier is seeded by pulses that are derived from the femtosecond oscillator. After stretching by a volume Bragg grating and amplification in a double stage fiber amplifier the pulses are injected into the Yb:KYW regenerative cavity.
Finally, the pulses are compressed to 1 ps before preparing pump pulses for the OPA by second harmonic conversion.
Proceedings Article 20 May Extreme light infrastructure: laser architecture and major challenges. Chambaret , O. Chekhlov , G.
Cheriaux , J. Collier , R. Dabu , P. Dombi , A. Dunne , K. Ertel , P. Georges , J. Hebling , J.