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.

We consider a laser with an injected signal, in which the polarization can be adiabatically eliminated, we study stability of steady-state solutions, and discuss time-dependent solutions. For alone, only possible solution is constant intensity. However, introduction external field, amplitude that does not satisfy injection-locking condition, destabilizes system. In such case, numerical results show existence self-Q-switching process, induces relaxation oscillations. The frequency giant...

Abstract The classical description of laser field buildup, based on time-averaged photon statistics Class A lasers, rests a statistical mixture coherent and incoherent photons. Here, applying multiple analysis techniques to temporal streams data acquired in the threshold region B mesoscale laser, we conclusively show that new physics is involved transition: lasing buildup controlled by large dynamical spikes, whose number increases as pump raised, evolving into an average field, modulated...

A Stochastic Simulator (SS) is proposed, based on a semiclassical description of the radiation-matter interaction, to obtain an efficient lasing transition for devices ranging from nanolaser traditional "macroscopic" laser. Steady-state predictions obtained with SS agree both more laser modeling and phase transitions in small-sized systems, provide additional information fluctuations. Dynamical can easily be obtained, good computing time efficiency, which convincingly highlights role...

We show that the instability threshold for a laser in which both polarizations are active can be much lower than Haken second and does not require bad-cavity limit.

We have measured the fractal dimensions and Kolmogorov entropies of periodic chaotic attractors for a ${\mathrm{CO}}_{2}$ laser system with modulated losses. In particular, we find an increase in dimension near accumulation point cascade according to Feigenbaum scaling law, besides expected usual attractor region. Numerical solutions theoretical model yield quantitative agreement experiments, thus demonstrating close match experiment theory this physical system.

AbstractAn infrared scanner has been assembled at the Istituto Nazionale di Ottica (Florence) for obtaining high quality digitized IR reflectograms of paintings. Results are compared with conventional obtained a Hamamatsu N214 vidicon tube.

Photon statistical measurements on a semiconductor microlaser, obtained using single-photon counting techniques, show that newly discovered spontaneous pulsed emission regime possesses superthermal properties. The observed spike dynamics, typical of small-scale devices, is at the origin an unexpected discordance between probability density function and its representation in terms first moments, so far unnoticed all devices. impact this new dynamics potentially large, since coincidence...

Nanolasers have steadily gained interest in the past years thanks to considerable technological advances. Interest very small lasers dates back early 1980's and effort was placed throughout 1990's on understanding threshold coherence properties of so-called thresholdless laser. Little progress has been made this front, mostly due scant amount information coming from experiments, limited by current detection technology. Very small-sized lasers, their extremely reduced cavity (and active...

The threshold properties of very small lasers (down to the nanoscale) are a topic active research in light continuous progress nanofabrication. With help simple rate equation model, we analyze intrinsic, macroscopic dynamics crossing for (class B) whose response is adequately described by interplay intracavity photon number and population inversion (energy reservoir). We use deterministic aspects basic equations extract some fundamental time constants from an approximate analysis laser...

The stochastic implementation of the laser rate equations is discussed in detail, light its application to numerically predict properties nanolasers. deterministic integration scheme analysed and tested for appropriateness problem. simplest stochastic, first-order considered particular requirements are discussed. Tests correctness numerical presented. Finally, thorough tests convergence performed, showing their different aspects possible pitfalls.

The generation of optical pulses at ultra low bias level, thus energy cost, is explored in a commercial microcavity semiconductor laser view testing the principle efficient information encoding potential integrated schemes. Sequences regular, highly nonlinear with acceptable amplitude stability are obtained from device as sources bits where added by post-treatment (pulse removal). A discussion on expenditure per bit offered, together optimal frequency for pulse generation, which found to lie...

Nanolasers are considered ideal candidates for communications and data processing at the chip-level thanks to their extremely reduced footprint, low thermal load potentially outstanding modulation bandwidth, which in some cases has been numerically estimated exceed hundreds of GHz. The few experimental implementations reported date, however, have so-far fallen very short such predictions, whether because technical difficulties or overoptimistic numerical results. We propose a methodology...

Lasers distinguish themselves for the high coherence and brightness of their radiation, features which have been exploited both in fundamental research a broad range technologies. However, emerging applications field imaging, can benefit from brightness, directionality efficiency, are impaired by speckle noise superimposed onto picture interference coherent scattered fields. We contribute novel approach to longstanding efforts reduction exploiting new emission regime typical nanolasers,...

Semiconductor lasers are notoriously sensitive to optical feedback, and their dynamics coherence can be significantly modified through reinjection. We concentrate on the dynamical properties of a very small (i.e., microscale) Vertical Cavity Surface Emitting Laser (VCSEL) operated in low region between emission (partially) coherent pulses ending below accepted macroscopic lasing threshold, with double objectives of: (1) studying feedback influence regime energy consumption (2) using...

We propose a new sensing method based on the measurement of second-order autocorrelation output micro- and nanolasers with intensity feedback. The function is implemented through feedback-induced threshold shift, whose photon statistics controlled by feedback level in characteristic way for different laser sizes. specific response offers performances which can be adapted to kinds sensors. implementation two schemes capable providing quantitative signal covering broad range levels: one...

Using a fully stochastic numerical scheme, we theoretically investigate the behavior of nanolaser in lasing transition region under influence intensity feedback. Studying input-output curves as well second-order correlations for different feedback fractions, obtain an insight into role played by fraction photons reinjected cavity. Our results reveal that shrinks and moves to lower pump values with strength, irregular pulses can be generated when is sufficiently large. The interpretation...