Showing papers by "E. M. Dianov published in 2003"

Crystalline and Fiber Raman Lasers

Abstract: This chapter describes the state of the art of crystalline and fiber Raman lasers based on the simulated Raman scattering (SRS) effect in crystals and silica-based fibers. It includes historical and theoretical background, analysis of properties of known and newly developed high-efficient SRS crystals, such as LiIO3, Ba(NO3)2, NaNO3, PbNO3, CaCO3, KGW, BaWO4, SrWO4,BaMoO4,SrMoO4, PbWO4, and germanosilicate and phosphosilicate fibers. A large set of data on IR Raman shifters and lasers operating in the CW, nanosecond, and picosecond regimes with low and high repetition rates is given. Some applications of Raman lasers in medicine, ecology, fiber optics, and communications are discussed.

Highly efficient one- and two-cascade Raman lasers based on phosphosilicate fibers

Abstract: Characteristics of one-cascade (106 ⇒ 124 µ m) and two-cascade (106 ⇒ 124 ⇒ 148 µ m) phos- phorus-doped fiber Raman lasers are studied The cavities of both lasers are formed by Bragg gratings written directly in the active fiber Double-cladding Yb 3+ and Nd 3+ ion fiber lasers with λ ~ 106 µ m were employed for pumping These lasers were pumped, in their turn, by diode laser arrays with λ ~ 098 µ m (Yb) and λ ~ 081 µ m (Nd) The efficiency of the one-cascade laser with an unprecedentedly short length of 50 m was as high as 65% with 48-W pump radiation applied to the input of the laser The maximum efficiency of the two-cascade Raman fiber laser was 40% Gratings directly written in the active fiber reduced concentrated losses in laser cavities, which allowed the laser length to be decreased and the lasing threshold power of Raman fiber lasers to be low- ered

Raman fiber source for the 1.6–1.75 μm spectral region

Abstract: We propose and experimentally realize a composite Raman converter based on P-doped and Gedoped fibers. The converter has an emission wavelength of 1.649 μm and an output power of 1.2 W. Numerical simulation of the configuration suggested was performed. A similar converter scheme can be used to build sources with any emission wavelength in the range from 1.6 to 1.75 μm.

Qualitative theory and modeling of hollow Bragg waveguides

Abstract: A qualitative analysis of a planar Bragg waveguide is done using coupled wave theory and rounded permittivity profile of the multilayer cladding Explicit formulae for trapped mode field distribution, ohmic and radiation losses are derived from the simplified dispersion equation Practical estimates of the waveguide parameters are given

Raman fiber source for 1.6-1.75 mm spectral region

Abstract: We report a development of Raman fiber source potentially operating in 1.6-1.75 /spl mu/m region in which typical rare-earth doped fiber lasers do not cover. The output power of 1.2W at 1.649 /spl mu/m is achieved.

Photosensitivity and photosensitization of highly phosphorus-doped fibers under 157-nm F/sub 2/ excimer laser irradiation

Abstract: Photosensitivity of highly phosphorus-doped fibers under 157-nm F/sub 2/ excimer laser irradiation has been investigated for the first time, Photosensitivity as well as photosensitization effects have been found to be much stronger as compared to 193-nm irradiation.