Subharmonic bifurcations, generalized multistability, and chaotic behavior were found experimentally in a $Q$-switched C${\mathrm{O}}_{2}$ laser operating at 10.6 \ensuremath{\mu}m. Jumps between two strange attractors lead to low-frequency ($\frac{1}{f}$ type) divergence the power spectrum. This is first experimental evidence of these phenomena quantum-optical molecular system. A theoretical model also presented whose results are good agreement with data.

The refractive indices of E7 liquid-crystal mixture were measured at six visible and two infrared (λ=1.55 10.6μm) wavelengths different temperatures, using Abbe wedged cell refractometer methods, respectively. experimental data the fit extended Cauchy equations well. Using equations, we can extrapolate to IR. extrapolated results almost strike through data. Thus, be used link infrared, where index measurements are more difficult.

In this paper, we have investigated on the potentialities of digital holography for whole reconstruction wavefields. We show that technique can be efficiently used obtaining quantitative information from intensity and phase distributions reconstructed field at different locations along propagation direction. The basic concept procedure wavefield in-line is discussed. Numerical reconstructions digitally recorded hologram patterns simulated test are presented. potential method analysing...

Chimera states, that is, dynamical regimes characterized by the existence of a symmetry-broken solution where coherent domain and an incoherent one coexist, have been theoretically demonstrated numerically found in networks homogeneously coupled identical oscillators. In this work we experimentally investigate behavior closed open chain electronic circuits with neuron-like spiking dynamics first neighbor connections. Experimental results show onset regime call chimera states quiescent...

The ability to see behind flames is a key challenge for the industrial field and particularly safety field. Development of new technologies detect live people through smoke in fire scenes an extremely desirable goal since it can save human lives. latest technologies, including equipment adopted by departments, use infrared bolometers digital cameras that allow users smoke. However, such detectors are blinded flame-emitted radiation. Here we show completely different approach makes lensless...

A nonlinear system with delayed feedback, whenever the delay time is much longer than intrinsic correlation time, displays two widely separated scales. In such a case, two-dimensional representation becomes appropriate, because it discloses features otherwise hidden in one-dimensional sequence of data, and allows use recognition algorithms developed for spatiotemporal chaos. As an illustration, chaotic sequences from single-mode laser feedback are analyzed using this representation.

The dynamical regime of a single mode laser with modulated losses in the chaotic parameter range has been stabilized over one periodic orbits contained within strange attractor by controlling phase small perturbation forcing term. Numerical solutions theoretical model show good agreement experiment and provide size stability windows space.

We revisit the laser model with cavity loss modulation, from which evidence of chaos and generalized multistability was discovered in 1982. Multistability refers to coexistence two or more attractors nonlinear dynamical systems. Despite its relative simplicity, adopted shows us how depends on dissipation system. The is then tested under action a secondary sinusoidal perturbation, can remove bistability when suitable phase chosen. surviving attractor one less dissipation. This control...

Homoclinic chaos is characterized by regular geometric orbits occurring at erratic times. Phase synchronization the average repetition frequency achieved a tiny periodic modulation of control parameter. An experiment has been carried on CO(2) laser with feedback, set in parameter range where homoclinic occurs. Any offset from induces phase slips over long Perfect recovered slow changes based upon sign and amplitude slip rate. Satellite regimes are also realized, variable numbers spikes per...

Successive transitions from Hopf bifurcation to Shilnikov chaos and eventually regular spiking are observed in a laser with feedback on increase of control parameter. Each one these regimes is due the dominant attraction at time among three coexisting unstable fixed points. Hence, each situation has global behavior sufficiently described by attribution major part return single point.

Self-pulsing and deterministic chaos is observed in a single-mode, homogeneous-line, ${\mathrm{CO}}_{2}$ laser with an overall negative feedback, when the damping constant of feedback loop same order as population decay rate. This represents fundamental limitation general use schemes high-stability applications. A theoretical model shown to yield results good agreement experimental ones, thus confirming simple structure associated phase space.

The exploration of chaos, synchronization, and circuit implementation in analog simulations unveils a versatile framework with diverse applications.Originating from universal chaos model rooted laser physics, its adaptability extends to neural dynamics random number generation, where both rely on characteristic time scales.Circuit implementations using op-amps multipliers offer tangible avenues for exploration.However, challenges like bias trajectory distortion drive the need innovative...

We investigate the transition route to phase synchronization in a chaotic laser with external modulation. Such is characterized by presence of regime periodic synchronization, which slips occur maximal coherence difference between output signal and provide first experimental evidence such demonstrate that it occurs at crossover point two different scaling laws intermittent-type behavior slips.

In a laser with delayed feedback operating in an oscillatory regime, phase defects appear for delays longer than the oscillation period. These are visualized by rearranging data two-dimensional representation. Two distinct disordered phases observed, one of weak turbulence characterized fluctuations, and highly developed constant density defects. The transition between two regimes is analyzed studying dependence defect lifetime on delay. experimental findings modeled via generalized Landau...

We demonstrate experimentally and theoretically the existence of slow chaotic spiking sequences in dynamics a semiconductor laser with ac-coupled optoelectronic feedback. The timescale these is fully determined by high-pass filter feedback loop their erratic, though deterministic, nature evidenced means interspike interval (ISI) probability distribution. eventually show that this regime result an incomplete homoclinic scenario to saddle-focus, where exact connection does not occur.

Controlling chaos is a process wherein an unstable periodic orbit embedded in chaotic attractor stabilized by means of tiny perturbations the system. These imply goal oriented feedback techniques which act either on state variables system or control parameters. We review some theoretical schemes and experimental implementations for chaos.

Phase-control techniques of chaos aim to extract periodic behaviors from chaotic systems by applying weak harmonic perturbations with a suitably chosen phase. However, little is known about the best strategy for selecting adequate reach desired states. Here we use experimental measures and numerical simulations assess benefits controlling individually three terms Duffing oscillator. Using real-time analog indicator able discriminate on-the-fly chaos, reconstruct experimentally phase versus...

We revisit the model of laser with feedback and minimal nonlinearity leading to chaos. Although has its origin in physics, peculiarities related [Formula: see text] laser, it belongs class three-dimensional paradigmatic nonlinear oscillator models giving The proposed contains three key nonlinearities, two which are type text], where fast slow variables. third one is an intermediate variable. analytically demonstrate that essential for producing chaos via local or global homoclinic...

Excitability and relaxation oscillations are shown to appear in the vicinity of subcritical or transcritical bifurcations with a different scenario from those previously introduced biology, chemistry liquid-crystal physics. Experimental observation such has been done laser intracavity saturable absorber.

Many chaotic oscillators have coherent phase dynamics but strong fluctuations in the amplitudes. At variance with such a behavior, homoclinic chaos is characterized by quite regular spikes fluctuation their time intervals due to recurrence saddle point. We study influences of noise on chaos. demonstrate both numerically and experimentally ${\mathrm{CO}}_{2}$ laser various constructive effects noise, including coherence resonance, noise-induced synchronization uncoupled systems noise-enhanced...