13 research outputs found
Resonance, multiple diffusion and critical tunneling for Gaussian lasers
We present a detailed study of the gaussian laser propagation through a
dielectric system composed by two right angle prisms. We investigate the
transition between the spatial coherence limit, which exhibits wave-like
properties and for which the resonance phenomenon can be seen, and the
decoherence limit, which exhibits particle-like properties and for which the
multiple diffusion occurs. We also analyze the tunneling at critical angles. In
our numerical analysis, we shall use BK7 and Fused Silica prisms and a gaussian
He-Ne laser with a wavelength of 632.8 nm and beam waists of 2 mm and 200
micron.Comment: 18 pages, 3 tables, 5 figure
The effect of the geometrical optical phase on the propagation of Hermite-Gaussian beams through transversal and parallel dielectric blocks
When an optical beam propagates through dielectric blocks, its optical phase
is responsible for the path of the beam. In particular, the first order Taylor
expansion of the geometrical part reproduces the path predicted by the Snell
and reflection laws whereas the first order expansion of the Fresnel phase
leads to the Goos-Haenchen shift. In this paper, we analyze the effects of the
second order Taylor expansion of the geometrical phase on the shape of the
optical beam and show how it affects the transversal symmetry of
Hermite-Gaussian beams. From the analytical expression of the transmitted beam,
it is possible to determine in which transversal and parallel dielectric blocks
configuration the transversal symmetry breaking is maximized or when the
symmetry is recovered. We also discuss the axial spreading delay.Comment: 14 pages, 4 figure
Weak measurement og the composite Goo-Haenchen shift in the critical region
By using a weak measurement technique, we investigated the interplay between
the angular and lateral Goos-Haenchen shift of a focused He-Ne laser beam for
incidence near the critical angle. We verified that this interplay dramatically
affects the composite Goos-Haenchen shift of the propagated beam. The
experimental results confirm theoretical predictions that recently appeared in
the literature.Comment: 10 pages, 3 figure