Presolar graphite in Murchison has been extensively studied [1, 2, 3]. It is characterized by a unique Ne isotopic composition, known as the Ne-E(L) component. According to studies by Huss and Lewis [4], the concentration of Ne-E(L) in Orgueil is about one order of magnitude higher than in Murchison, when normalized to the matrix. This could be due to a higher presolar graphite abundance in Org...

We study laser-matter interactions numerically by using massively parallel computers. The ion acceleration from a double layer target driven by a laser pulse with intensities I = 10-10 W/cm × (μm/λ) is investigated via multi-parametric particle-in-cell (PIC) simulations. For targets over a wide range of thicknesses l and densities ne, at a given intensity, the highest ion energy gain occurs for...

In the present study, influence of a 1.1 tesla Transverse Magnetic Field (TMF) on Laser-Induced Breakdown Spectroscopy (LIBS) Mg-alloy plasma has been explored. The Mg was produced using an Nd: YAG laser (1064 nm, 10 ns) at intensity 2 GW/cm2. Inert gases Ar, Ne, and He were filled as environmental pressures ranging from 1 to 100 Torr. Optical emission spectra laser-produced detected with help ...

Recent transient collisional excitation x-ray laser experiments are reported using the COMET tabletop laser driver at the Lawrence Livermore National Laboratory (LLNL). Ne-like and Ni-like ion x-ray laser schemes have been investigated with a combination of long 600 ps and short ~1 ps high power laser pulses with 5 10 J total energy. We show small signal gain saturation for x-ray lasers when a ...

OBJECTIVE To evaluate the adjunctive effect of a low-power He-Ne laser in the non-surgical periodontal treatment of patients with moderate to advanced chronic periodontitis. BACKGROUND DATA Laser applications in dental treatment are now more common in the literature. However, limited data are available on the potential effects of the low-power laser as an adjunct to non-surgical periodontal t...

In this contribution we focus on laser frequency noise properties and their influence on the interferometric displacement measurements. A setup for measurement of laser frequency noise is proposed and tested together with simultaneous measurement of fluctuations in displacement in the Michelson interferometer. Several laser sources, including traditional He-Ne and solid-state lasers, and their ...