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We present, to the best of our knowledge, the first intracavity pumped Yb:YAG thin-disk laser. It operates at 1050.7 nm with a quantum defect of just 1.74% due to pumping at 1032.4 nm. Low absorption of the pump light at the pump wavelength of 1032.4 nm is compensated for by placing the disk inside the resonator of another Yb:YAG thin-disk laser which is diode-pumped at 940 nm. The intra-cavity pumped laser has an output power of 10.3 W and a slope efficiency of 8.3%
Lebensmittelabfälle sind entlang der gesamten Wertschöpfungskette aus ethischer, ökologischer, sozialer und ökonomischer Perspektive problematisch und widersprechen dem Nachhaltigkeitsgedanken, wie er 1987 von der Brundtland-Kommission (WCED 1987) formuliert wurde. Besonders vor dem Hintergrund einer wachsenden Weltbevölkerung, knapper Ressourcen und einer steigenden Anzahl an Hunger leidenden Menschen ist die Verschwendung von Lebensmitteln nicht vertretbar.
DARP is a new protocol proposal with some interesting features like dynamic roles and the use of virtual sub-networks. This article discusses about the wireless sensor network state of art and presents some desirable features in order to adapt these networks to new scenarios. These necessities are quite important to expand the applicability of wireless sensor networks and for this reason, here DARP is proposed.
The spatially varying intensity in a standing wave resonator leads to spatial hole burning in the gain medium of a laser. The spatial hole burning changes the gain of different longitudinal modes and can thus determine the optical spectrum of the laser. We simulate this longitudinal mode competition in standing wave resonators of thin-disk lasers. The resulting optical spectra of the laser are compared to measured optical spectra. We examine two types of resonators: I-resonators and V-resonators with different angles of incidence. In V-resonators, the non-normal incidence of the laser beam on the disk lifts the degeneracy of the polarization. Experiments show that the slight gain advantage for the p-polarization does not lead to polarized emission. For both types of resonators, the measured spectra are in good agreement with the simulated ones. The simulations allow to study the influence of spectral intra-cavity losses on the optical spectrum of a thin-disk laser.
Large space telescopes made of deployable and lightweight structures suffer from aberrations caused by thermal deformations, gravitational release, and alignment errors which occur during the deployment procedure. An active optics system would allow on-site correction of wave-front errors, and ease the requirements on thermal and mechanical stability of the optical train. In the course of a project funded by the European Space Agency we have developed and manufactured a unimorph deformable mirror based on piezoelectric actuation. The mirror is able to work in space environment and is designed to correct for large aberrations of low order with high surface fidelity. This paper discusses design, manufacturing and performance results of the deformable mirror.
Generell ist eine kurzfristig unzureichende Nahrungsmittelzufuhr für den durchschnittlichen Bundesbuerger nicht unmittelbar mit gesundheitlichen Einschraenkungen verbunden. Vulnerable Bevoelkerungsgruppen sollten in derartigen Situationen jedoch eine besondere Beruecksichtigung erfahren. Zu diesen koennen die im Rahmen dieser Arbeit betrachteten Gruppen zaehlen. Aber auch chronisch kranke Menschen oder Personen mit Lebensmittelallergien weisen besondere Anforderungen an eine Lebensmittelversorgung im Krisenfall auf.