99 research outputs found
Light emission patterns from stadium-shaped semiconductor microcavity lasers
We study light emission patterns from stadium-shaped semiconductor (GaAs)
microcavity lasers theoretically and experimentally. Performing systematic wave
calculations for passive cavity modes, we demonstrate that the averaging by
low-loss modes, such as those realized in multi-mode lasing, generates an
emission pattern in good agreement with the ray model's prediction. In
addition, we show that the dependence of experimental far-field emission
patterns on the aspect ratio of the stadium cavity is well reproduced by the
ray model.Comment: 5 pages, 4 figure
Experimental Observation of Resonance-Assisted Tunneling
We present the first experimental observation of resonance-assisted
tunneling, a wave phenomenon, where regular-to-chaotic tunneling is strongly
enhanced by the presence of a classical nonlinear resonance chain. For this we
use a microwave cavity made of oxygen free copper with the shape of a
desymmetrized cosine billiard designed with a large nonlinear resonance chain
in the regular region. It is opened in a region, where only chaotic dynamics
takes place, such that the tunneling rate of a regular mode to the chaotic
region increases the line width of the mode. Resonance-assisted tunneling is
demonstrated by (i) a parametric variation and (ii) the characteristic plateau
and peak structure towards the semiclassical limit.Comment: 5 pages, 2 figure
Dependence of far-field characteristics on the number of lasing modes in stadium-shaped InGaAsP microlasers
We study spectral and far-field characteristics of lasing emission from
stadium-shaped semiconductor (InGaAsP) microlasers. We demonstrate that the
correspondence between a lasing far-field emission pattern and the result of a
ray simulation becomes better as the number of lasing modes increases. This
phenomenon is reproduced in the wave calculation of the cavity modes.Comment: 7 pages, 3 figure
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