We report on the microjoule pulse energy achieved in mode-locked erbium fiber lasers with kilometers-long normaldispersion
cavities. We also show that generated highly-chirped pulses are subject to efficient compression when
propagating in anomalous-dispersion telecom fibers.
We propose an experimental results and theoretical description of the ultrashort pulse train spectral broadening in tapered fibers. Multi-peak spectral structure due to the effect of self-phase modulation was obtained. Phase and amplitude fluctuations were investigated. Shown that stability of intermode beats decreased slightly after the propagation through tapered fiber. A technique and results of high precision measurements of the intermode frequency of a femtosecond Ti:sapphire laser for investigation of the influence of a tapered fiber are described. The experiments have shown that the intermode frequency stability does not depend on the broadened spectrum range.
Experimental and theoretical investigations of the Ti:S laser spectrum broadened in tapered fiber are presented. Dependence of broadened spectrum envelope on the waist diameter and coupled laser power was studied.
The principles of precision measurement of frequency intervals in optical range with the help of femtosecond lasers are described. An experimental scheme of femtosecond optical clock is described. The characteristics of the basic elements and units of the setup are presented. The results of a broadened spectrum researches with the help of tapered fibers are reported.
The local field correction in semiclassical model of superluminescence is presented for short and pencil-like samples. We propose a new experimental technique for stability measurements based on Fourier spectroscopy of laser pulses interacting with dense self-chirped resonant media having many atoms within a cubic wavelength an d theoretical model of the two-photon Fourier spectroscopy of Cs.