For the plasma formed under interaction of femtosecond laser radiation with the surface of a target electron velocity distribution has fundamentally non-maxwellian shape: besides thermal electrons, taking their origin from classical collisional mechanisms, hot electron component is formed. In particular such important effects as generation of hard X-rays with high spectral intensity and small p...

The non linear interaction between an intense laser radiation and atoms leads to ionization through the absorption of N photons from the laser radiation via laser-induced virtual states. The multiphoton ionization rate varies as a function of the laser intensity I as IN. We discuss the two most important effects which govern multiphoton ionization processes : resonance effects and laser-coheren...

plant cell cultures could be used as an important tool for biochemical production, ranging from natural pigments to pharmaceutical products. anthocyanin is affected by a variety of factors. light, an important plant environmental factor, influences the anthocyanin production in vegetative plant tissues. here, we have investigated the influence of the blue laser-diode (bld) and red laser-he ne (...

The paper presents experimental data on the absolute values of radiation intensity in wavelength range 6.6-32 nm for a stainless steel target excited by Nd: YAG laser with parameters λ=1064 nm, E pulse =0.45 J, tau=4 ns, ν=10 Hz. results are interest various applications using laboratory laser-plasma sources soft X-ray and extreme ultraviolet radiation. Keywords: radiation, emission spectrum, s...

In optically pumped lasers, heat generated by the quantum defect causes detrimental fluctuations in output mode, frequency, and power. Common heat-mitigation techniques use bulky mechanical coolers that introduce vibrations, leading to laser frequency amplitude noise. Here, we present a radiation-balanced fiber laser, cooled anti-Stokes fluorescence (ASF). The gain medium is silica with 21-µm-d...

( )IR EXPERIMENTS were designed to determine the effects of focused and unfocused laser radiation upon the heads of animals. This report is the result of our first set of experiments. While preparing these experiments, Drs. Sam Fine and Edmund Klein told us of their unreported experiments in which they produced subarachnoid hemorrhage and death in mice within a few minutes by directing an unfoc...

The generation and subsequent measurement of far-infrared radiation has found numerous applications in high-resolution spectroscopy, radio astronomy, and Terahertz imaging. For about 45 years, the generation of coherent, far-infrared radiation has been accomplished using the optically pumped molecular laser. Once far-infrared laser radiation is detected, the frequencies of these laser emissions...

We present theoretical and experimental evidence that nonionizing prepulses with intensities as low as 10(8)-10(9) W/cm(2) can substantially alter high intensity laser-solid interactions. We show that prepulse-heating and vaporization of the target can lead to a preformed plasma once the vapor is ionized by the rising edge of the high-intensity pulse. Our results indicate that peak prepulse int...

Acoustic cavitation which occurs at high intensities of ultrasound waves can be fatal for tumor cells. The existence of dissolved gases and also the presence of nanoparticles (NPs) in a liquid, irradiated by ultrasound, decrease the acoustic cavitation onset threshold and the resulting bubbles collapse. On the other hand, due to unique capabilities and optical properties of gold nanoparticles (...