Articole din publicaţii internaţionale: Recent submissions

Now showing items 1841-1860 of 3216

InGaN tandem blue–violet quantum well lasers with high frequency self-pulsations

TRONCIU, V. Z.; RUSU, S.; YAMADA, Minoru (Springer Nature Switzerland, 2015)

Theoretical investigations have been carried out to study the dynamics of tandem blue–violet lasers. The theoretical results show that self-pulsating operations are possible when one of the regions is adjusted with an ...
Improving the stability of distributed-feedback tapered master-oscillator power-amplifiers

TRONCIU, V. Z.; LICHTNER, M.; RADZIUNAS, M.; BANDELOW, U.; WENZEL, H. (Springer Nature Switzerland, 2009)

We report theoretical results on the wavelength stabilization in distributed-feedback master-oscillator power-amplifiers which are compact semiconductor laser devices capable of emitting a high brilliance beam at an optical ...
Improving the spectral performance of extended cavity diode lasers using angled-facet laser diode chips

KRÜGER, Mandy; TRONCIU, Vasile Z.; BAWAMIA, Ahmad; KÜRBIS, Christian; RADZIUNAS, Mindaugas; WENZEL, Hans; WICHT, Andreas; PETERS, Achim; TRÄNKLE, Günther (Springer Nature Switzerland, 2019)

We present and compare theoretical and experimental results on the electro-optical performance of extended cavity diode lasers (ECDLs) that employ two ridge waveguide designs for the single-transverse mode GaAs laser diode ...
Experimental and numerical study of Distributed-Bragg-Reflector tapered lasers

FIEBIG, C.; TRONCIU, V. Z.; LICHTNER, M.; PASCHKE, K.; WENZEL, H. (Springer Nature Switzerland, 2010)

We report results on experimental and numerical investigations of the output characteristics of edge-emitting distributed Bragg reflector tapered diode lasers emitting around 980 nm. The experimental results are well ...
Excitability of lasers with integrated dispersive reflector

TRONCIU, V. Z.; WUNSCHE, Hans-Juergen; SCHNEIDER, Klaus R.; RADZIUNAS, Mindaugas (Society of Photo-Optical Instrumentation Engineers (SPIE), 2001)

This paper is concerned with the phenomenon of excitability in semiconductor lasers consisting of a DFB section and a passive dispersive reflector (PDR). We assume that the PDR section contains a Bragg grating and/or a ...
Excitability of excitons and biexcitons in a ring cavity

TRONCIU, V. Z.; ABRAM, R. A. (American Physical Society, 2002)

We discuss the excitable behavior of excitons and biexcitons in a nonlinear optical ring cavity. The nonlinearity is due to the process of the creation of biexcitons by photon-assisted conversion of excitons. In the ...
Dynamics of single mode semiconductor lasers with passive dispersive reflectors

TRONCIU, Vasile Z.; WÜNSCHE, Hans-J.; SIEBER, Jan; SCHNEIDER, Klaus; HENNEBERGER, Fritz (Elsevier, 2000)

We discuss the impact of a passive dispersive reflector (PDR) on the dynamical behaviour of a single mode diode laser. It is shown that the PDR enters the single mode equations via two specific functions of the carrier ...
Dynamics of a nonlinear ring cavity: Excitability and coherent resonance

TRONCIU, V. Z.; ABRAM, R. A.; RUSU, S. S.; BARDETSKIĬ, P. I. (Springer Nature Switzerland, 2007)

The phenomena of excitability and coherent resonance in a nonlinear ring cavity in the presence of excitons and biexcitons are considered. A bifurcation analysis of the dynamics of the nonlinear ring cavity indicates that ...
Dynamical regimes of a multistripe laser array with external off-axis feedback

PIMENOV, Alexander; TRONCIU, Vasile Z.; BANDELOW, Uwe; VLADIMIROV, Andrei G. (Optical Society of America, 2013)

We theoretically study the dynamics of a multistripe laser array with an external cavity formed by either one or two off-axis feedback mirrors, which allow us to select a single lateral supermode with transversely modulated ...
Dynamical behavior of Bose-condensed dipole-active phonons and internal Fröhlich photons in biological media

CIOBANU, N.; RUSU, S.; TRONCIU, V. Z. (IEEE, 2015)

A theoretical model is developed to discuss the dynamical behavior of Bose-condensed dipole-active phonons and internal Fröhlich photons under the action of the external coherent pumping and damping of quasi-particles in ...
Dynamic Optical Bistability, Switching and Control of Self-Pulsations of Excitons and Biexcitons

TRONCIU, V. Z.; ROTARU, A. H. (WILEY-VCH Verlag Berlin GmbH, Fed. Rep. of Germany, 1999)

The theory of dynamic optical bistability and self-pulsations in condensed media is elaborated. The nonlinearity is due to a process in which two excitons are bound into a biexciton by virtue of their Coulomb interaction. ...
Controlling the unstable emission of a semiconductor laser subject to conventional optical feedback with a filtered feedback branch

ERMAKOV, I. V.; TRONCIU, V. Z.; COLET, Pere; MIRASSO, Claudio R. (Optical Society of America, 2009)

We show the advantages of controlling the unstable dynamics of a semiconductor laser subject to conventional optical feedback by means of a second filtered feedback branch. We give an overview of the analytical solutions ...
Control of quasiparticle self-fluctuations in a CuCl crystal

ROTARU, A. KH; TRONCHU, V. Z. (Springer Nature Switzerland, 1999)

A theory is developed for regular and chaotic self fluctuations in crystal CuCl for a ring resonator geometry. A system of nonlinear differential equations is derived for the dynamic evolution of coherent excitons, photons, ...
Control of interaction of millimeter waves with biological media

CIOBANU, Nellu; GRABOVSCHI, Ion; GUBCEAC, Natalia; OLOINIC, Tatiana; TRONCIU, Vasile (AIP Publishing LLC, 2019)

In this paper, we report studies on the dynamics of Bose-condensed dipole-active phonons and internal Fröhlich photons in biological media. The theoretical model is used to calculate the behavior of photons and phonons for ...
Chaotic semiconductor ring lasers subject to optical feedback: Applications to chaos-based communications

ERMAKOV, Ilya V.; KINGNI, Sifeu T.; TRONCIU, Vasile Z.; DANCKAERT, Jan (Elsevier, 2013)

Synchronisation of two unidirectionally coupled semiconductor ring lasers working in a chaotic regime (transmitter and receiver) is studied numerically. Two different configurations: open and closed loops, and two different ...
Chaotic dynamics of a semiconductor laser with double cavity feedback: Applications to phase shift keying modulation

TRONCIU, V. Z.; ERMAKOV, I. V.; COLET, Pere; MIRASSO, Claudio R. (Elsevier, 2008)

We report results on the numerical investigations of the dynamical behavior of a single mode semiconductor laser under the influence of double cavity optical feedback. We find that the system displays, under certain ...
Chaos-based communications using semiconductor lasers subject to feedback from an integrated double cavity

TRONCIU, V. Z.; MIRASSO, Claudio R.; COLET, Pere (IOP Publishing, 2008)

We report the results of numerical investigations of the dynamical behaviour of an integrated device composed of a semiconductor laser and a double cavity that provides optical feedback. Due to the influence of the feedback, ...
Chaos Generation and Synchronization Using an Integrated Source With an Air Gap

TRONCIU, Vasile Z.; MIRASSO, Claudio R.; COLET, Pere; HAMACHER, Michael; BENEDETTI, Mauro; VERCESI, Valeria; ANNOVAZZI-LODI, Valerio (IEEE, 2010)

We discuss experimentally and numerically the dynamical behavior of a novel integrated semiconductor laser subject to multiple optical feedback loops. The laser's structure consists of distributed feedback section coupled ...
Appearance of the optical turbulence and strange attractors breakdown in the coherent exciton and biexciton systems

ROTARU, A. H.; TRONCIU, V. Z. (IEEE, 1997)

Much attention is being paid of late to the study of cooperative processes in the exciton region of the spectrum. Previously, using generalized Keldysh equations that describe coherent excitons and photons that are weakly ...
Appearance and suppression of stochastic self-pulsations of coherent excitons and biexcitons in condensed matter

TRONCIU, V. Z.; ROTARU, A. H. (Society of Photo-Optical Instrumentation Engineers (SPIE), 1997)

The theory of regular and chaotic self-pulsations in a CuCl crystal with the participation of coherent excitons and biexcitons is elaborated. The method of chaotic self-pulsation suppression in the system of coherent ...

Now showing items 1841-1860 of 3216

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