A technique employing electron beams generated by an open gas discharge is proposed for measuring the light efficiency of phosphor coatings of cathodoluminescent screens. The total light efficiencies of various phosphor coatings in the medium excitation energy range (ɛ < 7 keV) are estimated with allowance for both the direct radiation flux outgoing from the phosphor screen and the backward radiation flux propagating along the exciting electron beam. The possibility is demonstrated of creating a high-luminance (∼20000 cd/m 2 ) cathodoluminescent source with a light efficiency of ∼60 lm/W.

The correlation between discharge structure and ozone yield has being investigated. Pictures of the discharge region proved that discharge is more homogeneous if the anode is conductive. The transferred charge values are different for negative and positive semicircle of the applied voltage in oxygen and air of normal pressure. Depending on the discharge conditions the charge transfer into discharge region takes place in distinct channels as well as in practically uniform discharge structure. The efficiency of the ozone synthesis are influenced by these conditions as well.

The process of ozone production and loss during the oxygen photodissociation upon the absorption of radiation from an excimer lamp with a wavelength of 172 nm was studied by experimental and theoretical methods. Analysis of the experimental data within the framework of a one-dimensional numerical model showed evidence for the presence of a previously unknown mechanism of the heterogeneous ozone loss in a flow of atomic oxygen.

Theoretical and experimental. studies of the transformation of the discharge energy into the dimer emission of Xe-2* (P-3(2)) under the conditions of sectioned discharge with a large number of elementary discharge cells are carried out. Oscillograms of the current and voltage in an elementary discharge cell were obtained. Temporal and spectral measurements of the intensity of dimer emission were performed. A simple model of the discharge was constructed, and it was demonstrated that from 50 to 75% of power deposited in a discharge can be transformed into dimer emission. A disagreement of the temporal dynamics of excimer radiation in experiments and simulation is pointed out This disagreement may be due to the inaccuracy of the data available in literature on the characteristic Lifetime of xenon Xe-2* ((3) Sigma) state at atmospheric pressure.

Carbon monoxide was made to lase by exciting a dense N = 1.35 × 1019 cm − 3 CO–N2–He–(O2–C2H4) gas mixture cooled to T = 110 K. A photoionization discharge was initiated by λ ≤ 130-nm ultraviolet radiation pulses of t ≈ 1 μs duration. The energy consumed in the photoionization process was 30% of that deposited in the volume discharge. The photoionization pump parameters were optimized and a study was made of the dynamics of reestablishing the optical homogeneity of the active medium after the photoionization and discharge pulses. Methods were proposed for raising the energy efficiency of CO photoionization lasers. A photoionization laser with an efficiency of ~ 11% and a specific output energy of 12 J · liter − 1 · atm − 1 was constructed. The laser pulse duration was 2–600 μs, depending on the gaseous composition of the medium. The absence of helium from the mixture caused a negligible deterioration in the laser energy characteristics.

The CO-laser is generated by exciting CO:N2:He:(02:C2H4) gas miksture cooled down to T= 110°K, N= 0.5 Amaga. The photoionization discharge is initiated by a short UV pulse of wavelength < 100 nm and duration t~ 1 μs at the reduced electric fill E/N < 3.3 x10-16 V.sm2. The energy consumed by direct photoionization of the (O2:C2H4) dope is 30% of the energy contribution to the volume discharge. The optimization of the photoionization pumping system parameters is examined. The dynamics of the recovery of optical homogeneity of active medium after the photoionization and discharge pulses is studied. The methods for improving the energy effectiveness of the photoionization CO-laser are proposed. The generation duration is shown to be adjustable within 2-600 μs, depending on the choice of the gas medium composition. The absence of He in the gas madium deteriorates but little the energy characteristics of the photoionization CO-laser. Effective excitation of the CO-CO2 laser media at temperatures of up to 145°K has been demonstrated to be in principle feasible.

A strongly self-luminous object, in the form of a quartz sample melted by CO2 laser radiation, was photographed. This object was illuminated with luminescence from the active medium of a copper vapor laser and then the reflected luminescence was amplified in the active medium and the image of the object was formed. The spectral brightness of the luminescence in the active medium of the copper vapor laser was several orders of magnitude higher than the blackbody spectral brightness for any attainable temperature. It was this circumstance that made it possible to observe processes such as the melting of quartz, to examine its molten surface, etc.

Investigations were made of the energy characteristics and optimal parameters of a photoionization discharge with different inorganic additives such as NO, NH/sub 3/, O/sub 2/, and Xe. A pulse-periodic photoionization discharge was found to provide an effective means of exciting gas-flow gas lasers. A quasi-cw CO/sub 2/-laser lasing regime with a low power consumption and photoionization of the additives NO and NH/sub 3/ was achieved.