DBR and DFB lasers in neodymium- and ytterbium-doped photothermorefractive glasses.

The first demonstration, to the best of our knowledge, of distributed Bragg reflector (DBR) and monolithic distributed feedback (DFB) lasers in photothermorefractive glass doped with rare-earth ions is reported. The lasers were produced by incorporation of the volume Bragg gratings into the laser gain elements. A monolithic single-frequency solid-state laser with a linewidth of 250 kHz and output power of 150 mW at 1066 nm is demonstrated.

Near-IR absorption in high-purity photothermorefractive glass and holographic optical elements: measurement and application for high-energy lasers.

Volume Bragg gratings (VBGs) in photothermorefractive (PTR) glass are widely used for laser beam control including high-power laser systems. Among them, spectral beam combining based on VBGs is one of the most promising. Achieving 100+ kW of combined laser beams requires the development of PTR glass and VBGs with an extremely low absorption coefficient and therefore methods of its measurement.

Continuous-wave diode-pumped laser action of Nd³⁺-doped photo-thermo-refractive glass.

Laser action of the photo-thermo-refractive (PTR) glass, which is the photosensitive material for holographic recording of volume Bragg gratings (VBGs), was demonstrated for the first time by introducing Nd³⁺. Nd:PTR glass has a bandwidth of 27.8 nm and 16.

High-efficiency bragg gratings in photothermorefractive glass.

Photosensitive silicate glasses doped with silver, cerium, fluorine, and bromine were fabricated at the Center for Research and Education in Optics and Lasers. Bragg diffractive gratings were recorded in the volume of these glasses with a photothermorefractive process (exposure to UV radiation of a He-Cd laser at 325 nm is followed by thermal development at 520 degrees C). Absolute diffraction efficiency of as much as 93% was observed for 1-mm-thick gratings with spatial frequencies up to 2500 mm(-1).

[Effect of hyperbaric oxygenation of lipid peroxidation and the antioxidant system in liver of white rats with acute sodium nitrate poisoning].

The experimental study carried out with white rats Wistar trend, which were introduced of sodium nitrate at a rate of 9.6 g/kg of their mass. It follows to the development of considerable activation of lipid peroxidation and depression of antioxidant system in liver.

[Work experience in detecting cancerous diseases of the oral mucosa at a dental polyclinic].

The paper present the experience gained in 10 years at the consultation and diagnosis room for buccal mucosa abnormalities in Dental Health Center No. 56 in Moscow. Three cases with cancer and precancer of the buccal mucosa and red lips detected in this room are described.

[Immunological indices in the differential diagnosis of rheumatic and nonrheumatic carditis].

The cellular and humoral immunity was studied in 32 children with primary rheumocarditis and 34 children with nonrheumatic carditis. It is shown that there are no distinct diagnostic criteria of rheumatism form with a paucity of symptoms. This gave an impetus to develop a new method of diagnosis of the rheumatic process by means of preincubation of blood lymphocytes of the patient with a standard streptococcal allergen (dose: 0.

[Effect of interferon on the course of experimental E coli-induced pyelonephritis].

The effect of the type I interferon on the development and process of experimental pyelonephritis caused by E. coli was studied on mice weighing 12 to 14 g. Interferon was administered intraperitoneally in a dose of 1000 units on days 3 and 7 of the disease.

[Interferon in the modulation of the immune response in pyelonephritis caused by Staphylococci and Pseudomonas aeruginosa].

In experiments on mice the influence of mouse serum interferon, type I, on immune response in pyelonephritis caused by staphylococci and P. aeruginosa has been studied. The immunomodulating action of interferon and its therapeutic effectiveness have been shown to depend on the etiology of the disease.

[Changes in the function and energy metabolism of the myocardium in experimental diabetes mellitus in dogs].

Coronary arteries, coronary sinus, heart cavities, and great vessels were catheterized in anesthetized dogs with alloxan diabetes. Cardiac contractility, coronary and systemic circulation, myocardial energy metabolism and acid-base balance were studied. It was shown that the alterations of the cardiac function occurred in experimental dogs with severe diabetes mellitus.