LASER PHYSICS: FINDINGS FROM A. ISHKHANYAN ET AL IN LASER PHYSICS REPORTED

Science Letter
August 26, 2008

According to a study from Armenia, "The weak nonlinearity limit of the
second-harmonic generation in a medium with variable second-order
susceptibility, changing along the direction of propagation of
interacting waves according to the hyperbolic secant law, is
considered."

"It is shown that the variation of the second harmonic’s normalized
intensity with the spatial coordinate is given in terms of the solution
to an auxiliary linear problem, which is known as the Rosen-Zener
quantum two-level model. The final intensity of the second harmonic
at the exit from the medium is calculated and analyzed," wrote
A. Ishkhanyan and colleagues (see also Laser Physics).

The researchers concluded: "It is shown that, for the particular
Rosen-Zener profile under consideration, because of its inherent
properties, the variation range of the peak susceptibility of the
layer for which the medium can be strictly considered as weakly
nonlinear is narrower than the corresponding parameter range for a
homogeneous medium."

Ishkhanyan and colleagues published their study in Laser
Physics (Second-harmonic generation in a layer with variable
susceptibility. Laser Physics, 2008;18(7):886-893).

For more information, contact A. Ishkhanyan, Armenian National Academy
Science, Institute Physics Research, Ashtarak 0203 2, Armenia.

Publisher contact information for the journal Laser Physics is:
Maik Nauka, Interperiodica, Springer, 233 Spring St., New York,
NY 10013-1578, USA.