Articole din publicaţii internaţionale: Recent submissions

Now showing items 1821-1840 of 3216

Theoretical studies of the generation of picoseconds pulses with two-section blue-violet semiconductor lasers

TRONCIU, V.; WENZEL, H.; KNIGGE, A. (IOP Publishing, 2012)

We report the results of theoretical investigations of the generation of sub-10 ps pulses by a blue-violet InGaN two-section laser. The principle of pulse generation is active Q-switching. We study numerically the influence ...
Theoretical Investigation of Striped and Non-Striped Broad Area Lasers With Off-Axis Feedback

LICHTNER, Mark; TRONCIU, Vasile Z.; VLADIMIROV, Andrei G. (IEEE, 2012)

We report a method to improve the beam quality of broad area lasers by using a V-shaped external cavity formed by two off-axis feedback mirrors that allow to select a single transverse mode with transversally modulated ...
Theoretical analysis of a multi-stripe laser array with external off-axis feedback

PIMENOV, A.; KOZYREFF, G.; TRONCIU, V. Z.; VLADIMIROV, A. G. (Society of Photo-Optical Instrumentation Engineers (SPIE), 2012)

We investigate the dynamical properties of broad area lasers with a V-shaped external cavity formed by two off-axis feedback mirrors that allow to select a single transverse mode with transversely modulated intensity ...
The appearance of structures of excitons, photons, and biexcitons, regular and chaotic in time, in direct-band semiconductors

TRONCIU, V. Z.; SHURA, K. V.; ROTARU, A. Kh. (Springer Nature Switzerland, 2002)

The dynamic properties of excitons and biexcitons in a ring cavity are studied. The nonlinearity of the problem is due to the direct binding of two excitons into a biexciton by virtue of the Coulomb attraction between them. ...
Tailoring the dynamics of diode lasers by passive dispersive reflectors

BANDELOW, Uwe; RADZIUNAS, Mindaugas; TRONCIU, V. Z.; WUNSCHE, Hans-Juergen; HENNEBERGER, Fritz (Society of Photo-Optical Instrumentation Engineers, SPIE, 2005)

Possibilities are investigated for influencing the dynamical behavior of diode lasers by means of integrated passive dispersive reflectors (PDR). The specific configurations comprise DFB lasers complemented with different ...
Study of wavelength switching time in tunable semiconductor micro-ring lasers: experiment and travelling wave description

KHODER, Mulham; RADZIUNAS, Mindaugas; TRONCIU, Vasile; VERSCHAFFELT, Guy (Optical Society of America, 2018)

We report in this paper the wavelength switching features of semiconductor ring lasers that are wavelength tunable based on filtered optical feedback. The filtered feedback provides a wavelength dependent loss mechanism ...
Study of Microintegrated External-Cavity Diode Lasers: Simulations, Analysis, and Experiments

RADZIUNAS, Mindaugas; TRONCIU, Vasile Z.; LUVSANDAMDIN, Erdenetsetseg; KÜRBIS, Christian; WICHT, Andreas; WENZEL, Hans (IEEE, 2015)

This paper reports the results of numerical and experimental investigations of the dynamics of an external-cavity diode laser device composed of a semiconductor laser and an external Bragg grating, which provides optical ...
Semiconductor ring laser with filtered optical feedback: traveling wave description and experimental validation

RADZIUNAS, Mindaugas; KHODER, Mulham; TRONCIU, Vasile; DANCKAERT, Jan; VERSCHAFFELT, Guy (American Physical Society, 2018)

We study experimentally and theoretically a semiconductor ring laser with four filtering channels providing filtered delayed optical feedback. To describe and analyze the wavelength selection and tuning in this device, we ...
Semiconductor laser under resonant feedback from a Fabry-Perot resonator: Stability of continuous-wave operation

TRONCIU, V. Z.; WÜNSCHE, H.-J.; WOLFRUM, M.; RADZIUNAS, M. (American Physical Society, 2006)

We study the continuous-wave (cw) operation of a semiconductor laser subject to optical feedback from a Fabry-Perot resonator in a case where the emission is resonant to a reflection minimum of the resonator. This configuration ...
Resonant coupling of a semiconductor laser to a Fabry-Perot resonator

TRONCIU, V. Z.; RADZIUNAS, M.; WUNSCHE, H.-J.; WOLFRUM, M. (IEEE, 2005)

This paper investigates resonant coupling of a semiconductor laser to a Fabry-Perot (FP) resonator. This study considers a laser emission which is transformed by a lossless FP into the feedback. The impact of this feedback ...
Quantum dots lasers dynamics under the influence of double cavity external feedback

RUSU, S. S.; OLOINIC, T.; TRONCIU, V. Z. (Elsevier, 2016)

This paper reports results on investigations of the dynamical behavior of a semiconductor laser with quantum dots active medium under the influence of a feedback from double external cavity. This configuration is treated ...
Numerical simulation of the amplification of picosecond laser pulses in tapered semiconductor amplifiers and comparison with experimental results

TRONCIU, V. Z.; SCHWERTFEGER, S.; RADZIUNAS, M.; KLEHR, A.; BANDELOW, U.; WENZEL, H. (Elsevier, 2012)

We apply a traveling wave model to the simulation of the amplification of laser pulses generated by Q-switched or mode-locked distributed-Bragg reflector lasers. The power amplifier monolithically integrates a ridge-waveguide ...
Numerical and experimental investigations of micro-integrated external cavity diode lasers

TRONCIU, V. Z.; RADZIUNAS, M.; KÜRBIS, Ch.; WENZEL, H.; WICHT, A. (Springer Nature Switzerland, 2015)

We report the results of numerical and experimental investigations of the electro-optical behaviour of an external cavity diode laser device composed of a semiconductor laser and a distant Bragg grating, which provides an ...
Nonlinear time-independent and time-dependent propagation of light in direct-gap semiconductors with paired excitons bound into biexcitons

ROTARU, A. Kh.; TRONCHU, V. Z. (Springer Nature Switzerland, 1997)

We study a new class of nonlinear cooperative phenomena that occur when light propagates in direct-gap semiconductors. The nonlinearity here is due to a process, first discussed by A. L. Ivanov, L. V. Keldysh, and V. V. ...
Nonlinear propagation of light in semiconductors in the presence of two-photon excitation of biexcitons

ROTARU, A. Kh.; TRONCHU, V. Z. (Springer Nature Switzerland, 1998)

The steady-and nonsteady-state passage of light through a ring resonator in the presence of two-photon excitation of biexcitons from the ground state of the crystal is studied. The values of the parameters for which ...
Mode transitions in distributed-feedback tapered master-oscillator power-amplifier: theory and experiments

RADZIUNAS, Mindaugas; TRONCIU, Vasile Z.; BANDELOW, Uwe; LICHTNER, Mark; SPREEMANN, Martin; WENZEL, Hans (Springer Nature Switzerland, 2008)

Theoretical and experimental investigations have been carried out to study the spectral and spatial behavior of monolithically integrated distributed-feedback tapered master-oscillators power-amplifiers emitting around 973 ...
Modal Behavior of an External Cavity Diode Laser

DUMANOV, E. V.; TRONCIU, V. Z.; WENZEL, H. (American Scientific Publishers, 2015)

This paper reports the results of numerical investigations of the modal behavior of an external cavity diode laser device composed of a semiconductor laser and a distant Bragg grating, which provides an optical feedback. ...
Investigations of external cavity diode lasers: Simulations, analysis and experiments

RADZIUNAS, M.; TRONCIU, V. Z.; LUVSANDAMDIN, E.; KÜRBIS, C.; WICHT, A.; WENZEL, H. (IEEE, 2014)

We report the results of numerical and experimental investigations of the dynamics in an external cavity diode laser device composed of a semiconductor laser and a distant Bragg grating, which provides an optical feedback. ...
Investigation of red-emitting distributed Bragg reflector lasers by means of numerical simulations

TRONCIU, Vasile Z.; WENZEL, Hans; RADZIUNAS, Mindaugas; REGGENTIN, Matthias; WIEDMANN, Jörg; KNIGGE, Andrea (The Institution of Engineering and Technology, 2018)

The authors report theoretical and experimental results on the properties of distributed Bragg reflector semiconductor lasers. Using the traveling wave equation model, they show that a proper choice of coupling coefficient ...
Instabilities and Bifurcations of a DFB Laser Frequency-Stabilized by a High-Finesse Resonator

TRONCIU, V.; WENZEL, H.; WÜNSCHE, H. J. (IEEE, 2017)

Recently reported miniature configurations with semiconductor distributed feedback lasers under resonant feedback are considered theoretically. Limiting instabilities and bifurcations are systematically explored by combining ...

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