We propose a miniature processing head for laser cutting of metal sheets. The thermally-induced focal shift is exacerbated at low values of the beam parameter product, but it is possible to arrange the optical elements such that the focal shift and beam waist variation cancel out. Collimating and focusing low-NA beams with short focal lenses make it possible to use standard plano-convex lenses ...

Laser biostimulation has been found effective in treatment of wound healing and inflammatory conditions. The nature and characteristics of laser light is different from natural light and of conventional light sources. Specifics of the laser include spectral coherence, temporal coherence and spatial coherence [1,2]. In addition, some lasers emit polarized photons and parallel beam. Laser with th...

Dynamic beam shaping brings a large potential for the laser cutting process by increasing speed and improving cut edge quality. However, oscillation is almost exclusively realized with 2-mirror galvanometer scanners that limit industrial implementation of technology. Within this work, new concept platform based on single-mirror scanning system 4 kW fiber tested 12 mm thick plates in different m...

The actual market volume of high-power lasers for manufacturing is dominated by diffusion cooled CO2 laser systems at the multi-kW range and lamp pumped Nd:YAG laser systems at the kW range. Substituting the lamps by diodes the Nd:YAG laser in rod design entered the market as diode pumped solid state laser of the first generation. With output powers up to 6 kW the diode pumped rod is used in in...

High power carbon dioxide lasers have successfully been used in drilling or cutting ngineering materials such as metals, polymers and ceramics over the years. Can a arbon dioxide laser be used to efficiently drill different rocks in a deep gas well? esearch sponsored by US Department of Energy has been carried out to answer this uestion. This paper will report the study results of using a super...

the modulation response, relative intensity noise and frequency noise characteristics of qd lasers are investigated theoretically, in presence of an additional optical pumping. it is revealed that the modulation response of qd laser enhances under additional optical beam. by small signal analysis of the carriers' and photons' rates, it is proposed that by injecting excess carriers to ...

In a class of systems of balance laws in several space dimensions, we prove the stability of solutions with respect to variations in the flow and in the source. This class comprises a model describing the cutting of metal plates by means of laser beam. © 2017 Elsevier Ltd. All rights reserved.