We present an energy-efficient method for conversion of relatively long (nanosecond) optical pulses into an extraordinary light structure – a packet of ordered picosecond pulses which differs from the known types of ordered ultrashort pulse patterns (like soliton molecules). The method relies on revealed peculiarities of nonlinear evolution of an ultrashort dark pulse implanted in a nanosecond bright pulse when they propagate in an optical fiber. Under certain conditions, energy of the background nanosecond pulse, which initially contains a single ultrashort dark pulse, can be mostly converted into a structured burst of ultrashort bright pulses. This burst can feature relatively high (manifold of the initial value) peak power and ultrahigh (sub-THz) intraburst pulse repetition. This dark pulse evolution develops at prorogation distances of a few tens of nonlinear lengths in telecom fibers under conditions of anomalous dispersion. Thus, it can be considered on the one hand as an important limitation for fiber transmission of particular optical waveforms, and on the other hand as a promising method for ultrashort pulse bursts generation.
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.
Sergei Bagayev, S. Chepurov, Vladimir Denisov, V. Klementyev, D. Kolker, Igor Korel, S. Kuznetsov, Yu. Matyugin, V. Pivtsov, V. Zakharyash, Timothy Birks, William Wadsworth, Philip Russell
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.
Sergei Bagayev, S. Chepurov, Vladimir Denisov, V. Klementyev, D. Kolker, Igor Korel, S. Kuznetsov, Yu. Matyugin, V. Pivtsov, V. Zakharyash, Timothy Birks, William Wadsworth, Philip Russell
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.
Sergei Bagayev, S. Chepurov, Vladimir Denisov, Alexander Dmitriyev, A. Dychkov, V. Klementyev, D. Kolker, Igor Korel, S. Kuznetsov, Yu. Matyugin, M. Okhapkin, V. Pivtsov, M. Skvortsov, V. Zakharyash, Timothy Birks, William Wadsworth, Philip Russell
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.
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