We investigated the role of prepulse laser wavelength on extreme-ultraviolet (EUV) emission and ionic debris generation. A 6 ns Nd:YAG laser operating at 266 nm was used to generate a pre-plasma that was then reheated by a 35 ns CO2 laser pumping pulse at 10.6 μm. At an ideal delay time, improvement in EUV conversion efficiency (CE) of up to 30 % was seen compared to the CE from the pumping pul...

The structure of momentum and concentration boundary layers developing over a bed of Potamocorbula amurensis clam mimics was studied. Laser Doppler velocimetry (LDV) and laser-induced fluorescence (LIF) probes were used to quantify velocity and concentration profiles in a laboratory flume containing 3969 model clams. Model clams incorporated passive roughness, active siphon pumping, and the abi...

The generation of light pulses around 100 fs was made possible by the introduction of the colliding pulse mode-locking technique [ 11. The specially designed laser produced femtosecond light pulses in the spectral range around 620 nm. The advanced understanding of the pulse shaping process and the introduction of an intracavity compensation of dispersion allowed the stable generation pulses bet...

Laser Dynamics 12 Laser Dynamics S. Dangel, A. Schneider, R. Holzner A main part of our research activities, besides the laser related projects described in the section on surface physics, is the investigation of nonlinear spatio-temporal e ects caused by the interaction of resonant laser beams with sodium atoms in the gas phase. A circularly polarized laser beam propagating through sodium vapo...

In this work, a steady-state heat transfer equation in a side-pumped Nd:YAG laser rod was solved numerically using finite element method (FEA). The resulting temperature and stress distributions were calculated under the condition of totally and partially direct side pumping structures with LASCAD software. From the result of simulation, we compare between the different pumping lengths, and mai...

4He (2 3Si) metastable atoms are optically pumped with intensity modulated light The use of a single mode diode-pumped LNA laser as the pumping source, allows the study of resonance signals predicted'by the optical pumping theory but not yet observed Resonances are detected on the transmitted pumping beam at the modulation frequency and its harmonics Application of this method to high sensitivi...

In this work we present, for the first time to our knowledge, laser emission under wavelength selective laser-pulsed pumping in Nd(3+)-doped TeO(2)-ZnO-ZnF(2) bulk glass for two different Nd(3+) concentrations. The fluorescence properties of Nd(3+) ions in this matrix which include, Judd-Ofelt calculation, stimulated emission cross-section of the laser transition and lifetimes are also presente...

Recent numerical and theoretical studies have demonstrated that the modes at threshold of a random laser are in direct correspondance with the resonances of the same system without gain, a feature which is well known in a conventional laser but which was not known until recently for a random laser. This paper presents numerical results, which extend such studies to the multimode regime that tak...

Recently a distributed Bragg reflection (DBR) laser diode was commercialised by SDL (USA) for helium optical pumping experiments. An interesting feature of the new device is the possibility of frequency modulation of the diode output by modulating the current intensity, leading to a new pumping scheme called optical pumping with frequency modulated light. We develop this method to induce spin p...