TY - BOOK A1 - Feldmeier, Achim T1 - Theoretical Fluid Dynamics T3 - Theoretical and Mathematical Physics Y1 - 2019 SN - 978-3-030-31021-9 (online) SN - 978-3-030-31023-3 (print) U6 - https://doi.org/10.1007/978-3-030-31022-6 PB - Springer CY - Cham ER - TY - BOOK A1 - Barceló, Pedro T1 - Alexander der Große Y1 - 2007 SN - 978-3-89678-610-4 PB - Primus-Verl. CY - Darmstadt ER - TY - BOOK ED - Mikelskis-Seifert, Silke ED - Rabe, Thorid T1 - Physik Methodik : Handbuch für die Sekundarstufe I und II Y1 - 2007 SN - 978-3-589-22377-0 PB - Cornelsen CY - Berlin ER - TY - BOOK A1 - Rahmstorf, Stefan A1 - Schellnhuber, Hans Joachim T1 - Der Klimawandel T3 - Becksche Reihe Y1 - 2006 SN - 3-406-50866-9 VL - 2366 PB - Beck CY - München ER - TY - BOOK ED - Mikelskis, Helmut F. T1 - Physik-Didaktik : Praxishandbuch für die Sekundarstufe I und II Y1 - 2006 SN - 3-589-22148-8 PB - Cornelsen Scriptor CY - Berlin ER - TY - BOOK ED - Mendes, Alexanda Navas ED - Vazquez, Graciela T1 - Adieu plus : comprension auditiva y visual de clases magistrales ; 14 CD-ROM T3 - Arqueología 02 Y1 - 2004 SN - 3-935024-93-2 VL - 2 PB - Univ.-Verl. CY - Potsdam ER - TY - BOOK A1 - Ostermeyer, Martin A1 - Kappe, Philip A1 - Menzel, Ralf A1 - Sommer, S. A1 - Dausinger, Friedrich T1 - Laser drilling in thin materials with bursts of ns-pulses generated by stimulated Brillouin scattering (SBS) N2 - A passively Q-switched laser with a nonlinear mirror on the basis of stimulated Brillouin scattering (SBS), generates bursts of pulses with a few 10 ns pulse duration and a separation between 20-90 mu s. Percussion drilling and trepanning are performed in different materials with 1 mm thickness. The optimum parameter set of these pulse trains with regard to the burr height and ablation rate is investigated. Differences in the processing results between single pulse and multi pulse structures are discussed. In addition the laser allowed for transiently mode locked operation. Results for mode locked and merely Q-switched operation were compared Y1 - 2005 ER - TY - BOOK A1 - Ostermeyer, Martin A1 - Brandenburg, Ingo T1 - Simulation of the extraction of near diffraction limited Gaussian beams from side pumped core doped ceramic Nd:YAG and conventional laser rods N2 - The application of the recently developed core doped ceramic Nd:YAG rods has the potential to provide better beam qualities compared to conventional rods since the hard aperture of the rod's boundary can be made wider while the width of the gain region remains the same. Thus, beam truncation and consequential diffraction can be reduced. We apply a finite elements model to calculate the resulting refractive index profiles in conventional and core doped rods. Propagating a Gaussian beam through both rod geometries the impact of aberrations and diffraction is compared for different side pumped scenarios. The potential advantage of the core doped geometry is discussed. (c) 2005 Optical Society of America Y1 - 2005 ER - TY - BOOK A1 - Ostermeyer, Martin A1 - Kappe, Philip A1 - Menzel, Ralf A1 - Wulfmeyer, Volker T1 - Diode-pumped Nd : YAG master oscillator power amplifier with high pulse energy, excellent beam quality, and frequency-stabilized master oscillator as a basis for a next-generation lidar system N2 - A pulsed, diode-laser-pumped Nd:YAG master oscillator power amplifier (MOPA) in rod geometry, frequency stabilized with a modified Pound-Drever-Hall scheme is presented. The apparatus delivers 33-ns pulses with a maximum pulse energy of 0.5 J at 1064 nm. The system was set up in two different configurations for repetition rates of 100 or 250 Hz. The beam quality was measured to be 1.5 times the diffraction limit at a pulse energy of 405 mJ and a repetition rate of 100 Hz. At 250 Hz with the same pulse energy, the M-2 was better than 2.1. The radiation is frequency converted with an efficiency of 50% to 532 nm. This MOPA system will be the pump laser of transmitters for a variety of high-end, scanning lidar systems. (C) 2005 Optical Society of America Y1 - 2005 ER - TY - BOOK A1 - Donner, Reik Volker A1 - Cser, Adrienn A1 - Schwarz, Udo A1 - Otto, Andreas H. A1 - Feudel, Ulrike T1 - An approach to a process model of laser beam melt ablation using methods of linear and non-linear data analysis N2 - As a non-contact process laser beam melt ablation offers several advantages compared to conventional processing mechanisms. During ablation the surface of the workpiece is molten by the energy of a CO2-laser beam, this melt is then driven out by the impulse of an additional process gas. Although the idea behind laser beam melt ablation is rather simple, the process itself has a major limitation in practical applications: with increasing ablation rate surface quality of the workpiece processed declines rapidly. With different ablation rates different surface structures can be distinguished, which can be characterised by suitable surface parameters. The corresponding regimes of pattern formation are found in linear and non-linear statistical properties of the recorded process emissions as well. While the ablation rate can be represented in terms of the line-energy, this parameter does not provide sufficient information about the full behaviour of the system. The dynamics of the system is dominated by oscillations due to the laser cycle but includes some periodically driven non-linear processes as well. Upon the basis of the measured time series, a corresponding model is developed. The deeper understanding of the process can be used to develop strategies for a process control. Y1 - 2004 SN - 3-527-40430-9 ER - TY - BOOK A1 - Pietsch, Ullrich A1 - Holý, Václav A1 - Baumbach, Tilo T1 - High resolution X-ray scattering from thin films and lateral nanostructures T3 - Advanced texts in physics : physics and astronomy online library Y1 - 2004 SN - 0-387-40092-3 PB - Springer CY - New York ET - 2. ed. ER - TY - BOOK A1 - Cramer, Marcus A1 - Eisert, Jens A1 - Illuminati, Fabrizio T1 - Inhomogeneous atomic Bose-Fermi mixtures in cubic lattices N2 - We determine the ground state properties of inhomogeneous mixtures of bosons and fermions in cubic lattices and parabolic confining potentials. For finite hopping we determine the domain boundaries between Mott-insulator plateaux and hopping-dominated regions for lattices of arbitrary dimension within mean-field and perturbation theory. The results are compared with a new numerical method that is based on a Gutzwiller variational approach for the bosons and an exact treatment for the fermions. The findings can be applied as a guideline for future experiments with trapped atomic Bose- Fermi mixtures in optical lattices Y1 - 2004 SN - 0031-9007 ER - TY - BOOK A1 - Görne, Thomas A1 - Bergweiler, Steffen T1 - Monitoring Lautsprecher in Studio- und HiFi-Technik : von der Aktivbox bis zur Surround-Abhöre Technik, Akustik, Aufstellung Y1 - 2004 SN - 3-932275-51-9 PB - PPV-Medien CY - Bergkirchen ER - TY - BOOK A1 - Donner, Reik Volker A1 - Cser, Adrienn A1 - Schwarz, Udo A1 - Otto, Andreas H. A1 - Feudel, Ulrike T1 - An approach to a process model of laser beam melt ablation using methods of linear and non-linear data analysis N2 - As a non-contact process laser beam melt ablation offers several advantages compared to conventional processing mechanisms. During ablation the surface of the workpiece is molten by the energy of a CO2-laser beam, this melt is then driven out by the impulse of an additional process gas. Although the idea behind laser beam melt ablation is rather simple, the process itself has a major limitation in practical applications: with increasing ablation rate surface quality of the workpiece processed declines rapidly. With different ablation rates different surface structures can be distinguished, which can be characterised by suitable surface parameters. The corresponding regimes of pattern formation are found in linear and non-linear statistical properties of the recorded process emissions as well. While the ablation rate can be represented in terms of the line-energy, this parameter does not provide sufficient information about the full behaviour of the system. The dynamics of the system is dominated by oscillations due to the laser cycle but includes some periodically driven non-linear processes as well. Upon the basis of the measured time series, a corresponding model is developed. The deeper understanding of the process can be used to develop strategies for a process control. Y1 - 2003 SN - 3-928921-88-6 ER - TY - BOOK A1 - Breuer, Elmar ED - Mikelskis, Helmut ED - Wilke, Hans-Joachim T1 - Physik plus : mit fächerübergreifenden Themen und Projektangeboten ; Kl. 9/10, [Hauptbd.], Gymnasium Sachsen-Anhalt Y1 - 2002 SN - 3-06-020981-2 PB - Volk-und-Wissen-Verl. CY - Berlin ER - TY - BOOK A1 - Backhaus, Udo ED - Mikelskis, Helmut ED - Wilke, Hans-Joachim ED - Schön, Lutz-Helmut T1 - Physik plus : Kl. 9/10, [Hauptbd.], Gymnasium Nordrhein-Westfalen Y1 - 2002 SN - 3-06-020980-4 PB - Volk und Wissen CY - Berlin ER - TY - BOOK A1 - Liebers, Klaus A1 - Breuer, Elmar ED - Mikelskis, Helmut ED - Wilke, Hans-Joachim T1 - Physik plus : mit fächerübergreifenden Themen und Projektangeboten ; Kl. 9/10, [Hauptbd.], Gymnasium Thüringen Y1 - 2002 SN - 3-06-020983-9 PB - Cornelsen CY - Berlin ER - TY - BOOK A1 - Breuer, Elmar ED - Mikelskis, Helmut ED - Wilke, Hans-Joachim T1 - Physik plus : Kl. 10, [Hauptbd.], Sek. 1 Sachsen Y1 - 2002 SN - 3-06-021021-7 PB - Cornelsen CY - Berlin ER - TY - BOOK A1 - Breuer, Elmar ED - Mikelskis, Helmut ED - Wilke, Hans-Joachim T1 - Physik plus : mit fächerübergreifenden Themen und Projektangeboten ; Kl. 9/10, [Hauptbd.], Sek. 1 Mecklenburg-Vorpommern Y1 - 2002 SN - 3-06-020985-5 PB - Volk-und-Wissen-Verl. CY - Berlin ER - TY - BOOK ED - Mikelskis, Helmut ED - Wilke, Hans-Joachim T1 - Physik plus : Kl. 7, Arbeitsh., Brandenburg Y1 - 2002 SN - 3-06-020752-6 PB - Cornelsen CY - Berlin ER -