The dynamics of a semiconductor laser with asymmetric current modulation and injection of external optical radiation is theoretically investigated. An asymmetric modulated laser generates irregular optical pulses both in amplitude and polarization. In this work, it is shown that injection of external optical radiation makes it possible to generate regular sub nanosecond optical pulses. The dependence of the statistical characteristics of the generated pulses on the parameters of the injected radiation is investigated.
In this paper, spatiotemporal dynamics of broad-area lasers with external optical injection is investigated. We demonstrate theoretically that relatively small optical injection suppresses unstable transverse modes and stabilizes laser output. We perform our study, taking into account the detuning between the frequency of the injected and generated radiation. The frequency detuning does not destroy the stabilizing effect. Parameters of the injected signal, at which effective suppression of transverse instabilities occurs, are found.
Temperature-induced laser dynamics of wide-aperture vertical cavity surface emitting semiconductor lasers (VCSELs) is under investigation. We describe the dynamics of VCSELs with circular and square apertures using the full system of two-dimensional Maxwell-Bloch equations. The results of numerical simulations in near and far fields are shown in dependence on frequency detuning, which can be presented as function of temperature. Results of simulations are compared with experimental data and theoretical predictions.
In the present paper we investigated the spatio-temporal instabilities of stationary lasing in class-B broad-area lasers. The onset conditions of filamentary instability and its spatio-temporal characteristics were obtained analytically on the basis of Maxwell-Bloch equations without phase-amplitude coupling. The lasing stabilization capabilities through varying laser parameters were considered. We demonstrated that coherent external optical injection can effectively suppress the transverse filamentary instability. We considered the case of weak optical injection, so that the amplitude of injected field is small compared to the amplitude of intracavity laser field. The latter restriction is ascribed to active cavity where injected field doesn’t play a driving role in laser operation. We report that injected field can have the stabilizing impact even for such relatively weak injection. Moreover our findings show that both relaxation oscillations and spiking behaviour may be significantly suppressed up to complete elimination in broad-area laser submit to coherent optical injection. All the results were also found to stay principally valid for weak nonzero phase-amplitude coupling.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.