The photochemica l iso tope separation sche mes have renewed the detailed in vestigati ons o f gas phase photophys ics and photochem istry of UF6 . O ne of the schemes is based o n massive multiphoton excitation o f UF6 us ing o ne or more suitab le IR laser frequcncy in 16l-lm region in its ground electronic state. In the present work we have mode lled such Infrared Multiphoton Di ssoc iati on...

The discharge quality and optimum pump parameters of a long-pulse high-pressure gas discharge excited KrCl laser are investigated. A three-electrode prepulse–mainpulse excitation circuit is employed as pump source. The discharge volume contains a gas mixture of HCl/Kr/Ne operated at a total pressure of up to 5 bar. For a plane–plane resonator, the divergence of both output laser beams is measur...

A total of 68 patients have been examined. Of these, 21 had functional class (FC) I stabile angina, 23 presented with FC II angina, 24 had FC III angina. Instituted in the control group patients (n = 30) was standard antianginal therapy (SAT). Laser therapy against the background of SAT employed has been found to improve the functional state of the myocardium, enhance tolerance to physical load...

The intensity of a He–Ne laser ~633 nm, 5 mW! transmitted by different GaSe samples is observed to change in correlation with a Nd-yttrium–aluminum–garnet laser pulse ~532 nm, 7.8 ns, 3 mJ! which excites them. Such time response has been attributed to a nonlinear optical effect, i.e., a decrease in the refractive index due to the exciton screening by the photogenerated carriers. A calculation o...

We report a surface-enhanced Raman scattering (SERS) microchip that is capable of measuring SERS signals of liquid samples with high sensitivity. The microdevice is an integration of a silicon-based SERS substrate, a multimode optical fiber (MMF), and a microchannel embedded in the photosensitive glass fabricated by the femtosecond laser followed by thermal treatment, wet etching, and annealing...

A new class of oxygen indicators is described. Platinum(II) and palladium(II) complexes of azatetrabenzoporphyrins occupy an intermediate position between tetrabenzoporphyrins and phthalocyanines and combine features of both. The new dyes are excitable in the red part of the spectrum and possess strong room-temperature NIR phosphorescence. Other features include excellent spectral compatibility...

The ionization rates and subsequent electron dynamics for laser-induced plasma channels are measured for the noble gas series He, Ne, Ar, Kr, and Xe at 1.0 atm. The cw fluorescence emission increases superlinearly in the series from He to Xe in agreement with Ammosov-Delone-Krainov tunnel ionization calculations. The electron temperature after laser-induced plasma formation, measured by four-wa...

We study electron correlation in sequential double ionization of noble gas atoms and HCl in intense, femtosecond laser pulses. We measure the photoelectron angular distributions of Ne+ relative to the first electron in a pump-probe experiment with 8 fs, 800 nm, circularly polarized laser pulses at a peak intensity of a few 10(15)  W/cm2. Using a linear-linear pump-probe setup, we further study ...

In this paper, the laser recording of thin diffraction gratings in deoxyribonucleic acid (DNA) – cetyltrimethyl-ammonium chloride (CTMA) surfactant doped with Rhodamine 610 (Rh610) films is experimentally investigated. The diffraction efficiency of the gratings induced in dye-doped DNA films by the interference of two Ar laser beams at 514.5 nm wavelength is monitored using a He-Ne probe beam (...

We report results of the study of soft-x-ray amplification in a discharge-created plasma under an externally applied axial magnetic field. This technique is observed to improve the uniformity and divergence of the beam of a 46.9-nm discharge-pumped Ne-like Ar soft-x-ray amplifier by decreasing the plasma density gradients at the time of lasing. At the optimum strength of 0.15 T, the magnetic fi...