We demonstrate that a beam of x-ray radiation can be generated by simply focusing a single high-intensity laser pulse into a gas jet. A millimeter-scale laser-produced plasma creates, accelerates, and wiggles an ultrashort and relativistic electron bunch. As they propagate in the ion channel produced in the wake of the laser pulse, the accelerated electrons undergo betatron oscillations, genera...

Here light propagation and radiation transfer of ultrafast laser pulses in heterogeneous biological tissues are simulated by use of the discrete-ordinates method (DOM). Formulations for solving the time-dependent radiation-transfer equation are deduced for three-dimensional geometries incorporating the Fresnel specularly reflecting boundary condition and characteristics of ultrafast laser pulse...

of this study was to analyze the effects of carbon dioxide (CO2) laser light on the structure and elemental composition of dentine. METHODS The evaluation was conducted on samples from extracted teeth. The surface of the dentine was exposed to the radiation from a CTL 1401 CO2 laser (Centre of Laser Technology, Poland). The radiation and frequency parameters were as follows: group I with 5 W ...

High Power Lasers produce an intense burst of Bremmstrahlung radiation which has potential applications in broadband x-ray radiography. Since the radiation produced is through the interaction of accelerated electrons with the remaining laser target, these bursts are extremely short – in the region of a few ps. As a result, the laser-produced x-rays are capable of imaging complex dynamic objects...

The introduction of a plasma in a free-electron laser (FEL) helps radiation guiding via nonlinear refraction. At highradiation power density, when oscillatory electron velocity is comparable to the electron thermal velocity, the radiation pushes plasma radially out, forming a depleted plasma duct and guiding the radiation. The radius of the self-trapped laser is ~C/OJPO , where UJPO is the unpe...

Numerous proposals to induce nuclear transformations by intense lasers ~see, e.g., Ref. 1! predicted exceedingly small output of ‘‘nuclear radiation’’ ~positrons, gammaphotons, neutrons, and fission fragments!, even for the laser intensity still out of reach. In fact, efficient production of nuclear radiation was not the subject of those proposals; as a result, optimal choice of processes and t...

Radiation reaction effects will play an important role in near-future laser facilities, yet their theoretical description remains obscure. We explore the Ford-O'Connell equation for radiation reaction, and discuss its relation to other commonly used treatments. By analyzing the interaction of a high energy electron in an intense laser pulse, we find that radiation reaction effects prevent the p...

This study was conducted to examine and compare the clinical response of patients with small hemangiomas treated with two non-ablative lasers with wavelength radiation 755 nm and 595 nm. The treatment efficacy – curative effect and loss of pigment and appearance of scars were compared using Pearson’s chi-square test. The therapeutic effect of 595 nm laser radiation was very high – almost 100%. ...