نتایج جستجو برای: solid laser
تعداد نتایج: 367312 فیلتر نتایج به سال:
When a laser pulse propagating in a near critical density plasma, its quality can be spontaneously improved by this “plasma lens” through transverse self-focusing, longitudinal profile steepening and pre-pulse cleaning. High energetic density electrons can also be generated in this process, which is crucial for the high gradient acceleration field formation. Both effect can significantly enhanc...
Comment There are three major problems in the endoscopic laser treatment of bleeding gastric cancer. Firstly, the tumour is often large, making coagulation of the entire surface impossible. Secondly, tumours may protrude into the lumen, making access to the distal surface of the lesion impossible. Finally, blood and clot in the stomach obscure the view. The possibility of using the laser at low...
We investigate numerically effects related to “single-cycle” ionization of dense matter by an ultra-short laser pulse. The strongly non-adiabatic response of electrons leads to generation of a MG steady magnetic field in laser-solid interaction. By using two-beam interference, it is possible to create periodic density structures able to trap light and to generate relativistic ionization
By applying the femtosecond laser ablation technique, we have simultaneously atomized and ionized large organic molecules on a solid substrate. This observation is in contrast with the photoionization of cyclic aromatic hydrocarbons by femtosecond laser in the gas phase where little fragmentation has been observed. Our result will promote the development of single-shot chemical analyses of isot...
The new laser method for nanostructures formation on a surface of semiconductors Si, Ge, GaAs and SiGe, CdZnTe solid solutions is proposed. For the first time was shown the possibility of graded band gap structure formation in elementary semiconductors. Thermogradient effect has a main role in initial stage of nano-cones and graded band gap structure formation by laser radiation in semiconductors.
A high energy double-pulsed Ho:Tm:YLF 2-μm laser amplifier has been demonstrated. 600 mJ per pulse pair under Qswitch operation is achieved with the gain of 4.4. This solid-state laser source can be used as lidar transmitter for multiple lidar applications such as coherent wind and carbon dioxide measurements.
The angular distribution of bremsstrahlung gamma rays produced by fast electrons accelerated in relativistic laser-solid interaction has been studied by photoneutron activation in copper. We show that the gamma-ray beam moves from the target normal to the direction of the k(laser) vector as the scale length is increased. Similar behavior is found also in 2D particle-in-cell simulations.
The interaction of petawatt (10(15) W) lasers with solid matter forms the basis for advanced scientific applications such as table-top particle accelerators, ultrafast imaging systems and laser fusion. Key metrics for these applications relate to absorption, yet conditions in this regime are so nonlinear that it is often impossible to know the fraction of absorbed light f, and even the range of...
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