The paper reports on a study of oxygen-iodine laser operating on active mixture formed by electric discharge in pulseperiodic
mode. Experiments were performed with a laser cavity 5 m long. Laser pulses obtained for three various
chlorine flow rates ((62 ± 2) mmol/s, (92 ± 2) mmol/s, (105 ± 2) mmol/s) have been manipulated by the statistic rules.
The repetition rate of pulses was 12.5 Hz. The chlorine concentration in the laser cavity was varied in the experiments
from 1.0·10<sup>15</sup> to 1.0·1016 cm<sup>-3</sup>.
The paper describes a study of pulse-periodic operation of a chemical oxygen-iodine laser. The generator in use was of the jet type with high chlorine utilization degree (⩾97%). Atomic iodine was released by dissociating methyl-iodide (CH<sub>3</sub>I) in volumetric electric discharge. Steady lasing was achieved at a repetition rate up to 30 Hz.
The emission energy attained per individual pulse in a train was 1.1 J at a pulse energy repeatability of (3÷5) % and a specific energy extraction from the active medium of 1.7 J/L. The lasing pulse duration depended on the concentration of methyl-iodide and the energy deposited into discharge. The minimal half-height duration of pulses was achieved as 10 &mgr;m at a concentration of atomic iodine in the laser cavity ~1*10<sup>15</sup> cm<sup>-3</sup>.
The results of research of properties and preparation conditions of the plasmochemical SiO<sub>2</sub> films are submitted. These films coated various substrates (glass, metals, NaCl). Film deposition was carried out by decomposition of the tetraethoxycilane vapor by the electrical discharge with the frequency of about 18 kHz. The excessive products of decomposition were pumped out with maintenance of the tetraethoxycilane vapor and argon pressure of about 0.2 Torr. The study of element structure has shown that the film represents Si<sub>x</sub>O<sub>y</sub> with x ≈ 1 and y ≈ 2 and contains an impurity of organic inclusions. Density and index of refraction of a coating are close to these parameters for glass SiO<sub>2</sub>. The form of the film surface is investigated depending on the coating conditions. Infrared spectra of absorption and Raman spectra are investigated. The results of attempts of the iodine in this film as an impurity are given. This method is applied for preparing of the covering with uniform thickness on glass microspheres used as targets in laser fusion experiments on the installation "Iskra-5."