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The paper presents the results on long-period and fiber Bragg gratings inscription in non-photosensitive optical fibers by femtosecond radiation with the wavelengths of 513 nm and 1026 nm. The slit beam shaping method is proposed for LPG fabrication to increase the resonant peak amplitude and to reduce the out-of band losses due to smoother profile of refractive index change. The Bragg gratings were...
The paper presents the results on Bragg gratings inscription in non-photosensitive optical fibers through the polyimide protective coating by femtosecond radiation with the wavelength of 1026 nm. The Bragg gratings inscribed by a point-by-point method in specialized optical fibers: high-temperature resistant Fibercore SM1500(9/125)P and hydrogen resistant Fibercore SM1500SC(9/125)P have reflectivity...
This paper reports the Rayleigh scattering effects in ultra-long Raman fibre laser. It has been found that in a long fibre cavity (-100 km) the distributed feedback due to Rayleigh back scattering at propagation of light between fibre Bragg grating reflectors may be comparable with the lumped feedback provided by the FBG itself. As a result, Raman lasing in the fibre span limited by lumped (FBG) reflector...
For the first time it was experimentally demonstrated the interaction of core modes in 4-core fiber with large distance between the cores (28 mum). It was established that the effect of interaction is very sensitive to the fiber curving. The effect explanation based on indirect interaction of the cores inside the fiber through the central shell mode is given. The 70% energy transfer from one core...
The conventional RFL output spectrum and power are analytically described by the optical wave turbulence approach. The turbulent broadening can be also important in other types of fiber lasers, propagation phenomena and CW supercontinuum generation.
In this paper we have experimentally demonstrated for the first time that the mode structure can be resolved up to the record laser cavity length of 84 km. Very narrow RF peaks reveal that the relative phase fluctuations between the neighbouring modes are very small even propagating through such a long span, but with increasing power they broaden significantly due to nonlinear interaction. Thus, our...
The turbulent nature of the generation of multiple cavity modes in ultra-long Raman fiber lasers is demonstrated in this study. Observations show turbulence-induced broadening of the intra-cavity spectrum and formation of clearly pronounced exponential tails at the power level as small as ~0.1 W. This broadening is likely to occur due to nonlinear four-wave mixing.
An analytical wave kinetic theory has been developed that describes a Raman fiber laser (RFL) generation spectrum. A four-wave mixing between RFL longitudinal modes in turbulent regime is shown to be the main broadening mechanism.
We propose a four-level atomic system with a closed interaction contour connected by two coupled laser fields and a microwave laser field. The transition driven by the probe laser field is outside of the closed interaction contour. In such a system, we mainly discuss the variation of the frequency intervals of double-EIT due to the effect of the closed interaction phase and the strengths of applied...
Spectral broadening and its influence on the output power and intensity interactions in cascades of a Raman fiber laser has been studied experimentally and theoretically. The effect appears very important for the RFL optimal performance.
Effects of intensity interactions (pump power depletion and sequential saturation of cascade generation) have been studied in a two-stage phosphosilicate Raman fiber laser in experiment and modeling. An analytical model of the laser which takes into account power variation along the fiber and spectral broadening of the first Stokes wave has been developed that describes experimental data both qualitatively...
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