Turbulence-induced square-root broadening of the Raman fiber laser output spectrum.

The output characteristics of the conventional one-stage Raman fiber laser (RFL) are described in an optical wave turbulence formalism. Simple analytical expressions describing RFL output power and its spectral shape are presented, and square-root law for the output spectrum broadening law has been discovered. The indications of the turbulent-like spectral broadening in other types of cw fiber lasers and propagation phenomena in fibers are also discussed.

Spectral broadening in Raman fiber lasers.

We present an analytical theory based on wave kinetic equations that describes a Raman fiber laser (RFL) generation spectrum. It is shown both theoretically and experimentally that the quasi-degenerate four-wave mixing between different longitudinal modes is the main broadening mechanism in the one-stage RFL at high powers. The shape and power dependence of the intracavity Stokes wave spectrum are in excellent quantitative agreement with predictions of the theory.

[A new species of black flies in the genus Montisimulium (Diptera: Simuliidae) from the environs of Alma-Ata].

A new species of blackflies, Montisimulium peskovi sp. n. from the northern Tien Shan (Kazakhstan Republic) is described.

[Prophylactic effectiveness of a live recombinant influenza type A vaccine in immunizing children aged 3-14 years].

Children aged 3 to 14 were immunized with live recombinant influenza A vaccine; about 120,000 children were followed up for 6 months. Analysis of the morbidity (excepting ARVI and influenza) of the immunized and control groups permitted a conclusion about the safety of the preparation. The protective index of vaccine efficacy during influenza epidemic caused by A/Taiwan/1/86(H1N1) virus was 1.

[The modelling of a persistent parainfluenza infection].

A model of parainfluenza persistent infection was developed in guinea pigs, based on the use of the suckling-adapted virus and an immunosuppressor cyclophosphan. The latter increased the titre of virus and its antigen and duration of their detection in the organs, but the dynamics of these findings was different, and also delayed the time of appearance and slightly prolonged the period of detection of antibody.