We report passive mode locking of a soliton erbium-doped double-clad fiber laser operating at the 322nd harmonic fundamental cavity frequency. Repetition rates up to 3 GHz have been obtained with pulses 1 ps duration and 18 pJ energy. The supermode suppression is better than 25 dB. In addition, transition dynamics from bunched state stable presented, revealing very long time scale.

We demonstrate experimentally a double-clad Er:Yb co-doped dual amplifier passive mode-locked figure-of-eight fiber laser that generates high energy, width, and amplitude tunable dissipative soliton resonance square pulses. In our system, each loop contains an controls characteristic of the output pulse. The width beam can be controlled continuously but, dependently, according to pump power amplifier. pulse tuned in range almost 360 ns while peak varies from 8 120 W. On maximum possible...

We give a detailed theoretical analysis of spontaneous periodic pattern formation in fiber lasers. The consists bound state hundreds pulses ring laser passively mode locked by nonlinear rotation the polarization. phenomenon is described theoretically using multiscale approach to gain dynamics: fast evolution small excess responsible for stabilization pattern, while slow mean value explains finite length quasiperiodic soliton train. resulting model well adapted experimental observations...

We investigate multiple-soliton pattern formations in a figure-of-eight passively mode-locked fiber laser. Operation the anomalous dispersion regime with double-clad amplifier allows generation of up to several hundreds solitons per round trip. report observation remarkable soliton distributions: gas, liquid, polycrystal, and crystal, thus indicating universality such complexes.

We demonstrate a widely tunable Er:Yb-doped double-clad multiple-soliton fiber laser based on nonlinear polarization rotation (NPR). Based both an artificial birefringent filtering effect of the cavity and population inversion related gain variation, central wavelength can be continuously tuned over 75 nm range (1545–1620 nm). Wavelength tunability is achieved by controlling linear loss controllers (PCs). This widest yet reported in passively mode-locked erbium-doped lasers.

We have experimentally demonstrated square pulses emission from a co-doped Er:Yb double-clad fiber laser operating in anomalous dispersion DSR regime using the nonlinear polarization evolution technique. Stable mode-locked repetition rate of 373 kHz with 2.27 µJ energy per pulse under pumping power 30 W cavity. With increase pump power, both duration and output broaden. The experimental results demonstrate that passively can also realize high-energy pulse, which is different conventional...

Through this scientific research, we have tried to study the effect of incorporation plastic waste on mechanical properties concrete, in order obtain good concrete with high resistance at a lower cost. To carry out work, adopted following steps: Knowledge which contains High Density Polyethylene (HDPE). Thus, natural aggregate was replaced by formulated partial substitution varying between 0%, 10% and 20%. In all mixtures, components, water, cement, gravel 3/8 8/15 sand 0/3, remained...

We demonstrate a passive mode-locked Er:Yb doped double-clad fiber laser using microfiber-based topological insulator (Bi(2)Se(3)) saturable absorber (TISA). By optimizing the cavity loss and output coupling ratio, can operate in L-band with high average power. With highest pump power of 5 W, 91st harmonic mode locking soliton bunches 308 mW was obtained. This is first report that TISA based erbium-doped operating above 1.6 μm also yet reported laser.

We investigate theoretically the mode-locking properties of an erbium-doped birefringent fiber laser in a unidirectional cavity containing optical isolator. The is achieved through nonlinear polarization rotation. approach based on master equation which takes explicitly into account angles between eigen axis at each side polarizer. stability conditions both stationary and localized solutions are determined. This allows to establish diagram versus gives domains where operates continuous,...

We consider a Yb-doped double-clad fiber laser in unidirectional ring cavity containing polarizer placed between two half-wave plates. Depending on the orientation of phase plates, operates continuous, Q-switch, mode-lock, or unstable self-pulsing regime. An experimental study stability mode-locking regime is realized versus A model for self-mode-locking and cw operation developed starting from two-coupled nonlinear Schr\"odinger equations gain medium. The reduced to master equation which...

We report the observation of bound states 350 pulses in a ring fiber laser mode locked by nonlinear rotation polarization. The phenomenon is described theoretically using multiscale approach to gain dynamics; fast evolution small excess responsible for stabilization periodic pattern, while slow mean value explains finite length quasiperiodic soliton train.

We demonstrate a passive mode-locked Er:Yb doped double-clad ring fiber laser based on graphene saturable absorber.By adjusting the polarization controller and minimizing cavity loss, can operate at hundreds of harmonics fundamental repetition frequency resonator with central wavelength 1.61 μm.Up to 683rd harmonic (which corresponds 5.882 GHz) was achieved.

The study's contribution is to examine, while taking into account pinned-pinned boundary conditions, the free vibration response of multi-cracks Euler-Bernoulli perfect FG beams structure on Pasternak-Winkler elastic foundations. finite element approach used discretize equations. material properties are taken using a power-law form, and they differ in thickness width directions beam structure. 2D beam's reduced cross section calculate stiffness cracked On other hand, type foundation has...

We report a fully analytical study of figure-eight passively mode-locked fiber lasers. An adapted master equation is established for the laser. It cubic complex Ginzburg-Landau type, in which coefficients explicitly depend on characteristics cavity. derive stability conditions and continuous wave operations both net positive dispersion negative dispersion. In soliton regime, duration pulse energy are studied. The model points out great sensitivity parameters cavity, particular, orientation...

We demonstrate the generation of dissipative soliton resonance square pulses from a co-doped Er:Yb double-clad fiber ring laser operating in an all anomalous dispersion regime. The obtained have repetition rate 672 kHz and pulse energy 409 nJ. By carefully adjusting polarization controllers while increasing pump power, can split into series identical equally spaced smaller up to 13th harmonic fundamental frequency. average output follows scaling law versus order.

We report experimental observation of passive harmonic mode locking (HML) in which the basic pattern is a soliton crystal. Several crystal states were generated from an initial large bound state by increasing pump power. The crystals are identical and progressively span along cavity to finally take regular spacing leading HML solitons

Based on the control of linear losses cavity, we demonstrate possibility to achieve filterless laser emission above 1.6 μm, from a C-band double-clad Er:Yb doped fiber amplifier. The concept is validated in both continuous wave and mode-locked regimes, using figure-of-eight geometry. A unidirectional ring cavity also tested regime. Spectral properties emissions are characterized as function intracavity losses.