Showing papers by "E. M. Dianov published in 1986"

Dynamics of ultrashort-pulse generation by Raman fiber lasers: cascade self-mode locking, optical pulsons, and solitons.

Abstract: The dynamics of ultrashort-pulse generation in Raman fiber lasers is numerically investigated. The regime of cascade self-mode locking in the process of generation of higher-order Stokes components as well as formation of ultrashort solitary pulses with a high contrast of radiation are described. The generation of optical solitons at the Stokes frequency is shown to be the result of a cooperative effect of self-phase modulation, negative group-velocity dispersion, and distributed stimulated Raman scattering. In the same way we explain the formation of pulses with regularly pulsating amplitude and frequency modulation; we call these optical pulsons.

Mechanisms of optical losses in polycrystalline KRS-5 fibers

Abstract: The widening of distribution of the laser radiation transmitted through the polycrystalline KRS-5 fiber which leads to the domination of the surface scattering and absorption in the total optical losses has been measured. It has been found from the obtained data that the value of the loss increases with the number of reflections at the side fiber surface per unit length of the fiber. Scanning electron microscopy of the side surface has shown the presence of hollows along the grain boundaries and other surface imperfections.

Preparation And Investigation Of Chalcogenide Glass Optical Fibers

Abstract: Chalcogenide glass optical fibers with optical losses of 0.3-1 dB/m in the 3.5-7 I'm wavelength region have been obtained. The fibers optical properties as well as the dependence of their optical losses on low temperature and time have been investigated.© (1986) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.