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[12:00-13:00] MST colloquium
- Description:
- THURSDAY April 26, 2018
Speaker: Prof. Dimitris Papazoglou
Affiliation: Materials Science and Technology Department,
University of Crete and IESL-FORTH
Title: Shaped Optical Wave Packets
Location: Computer Science Department, room A115 (ground floor), Voutes
TIME: 12.00
Language: English
Abstract
Optical wave packets are often used as means of energy delivery on a
remote target with applications ranging from direct laser writing, to
non-linear wave mixing and harmonics generation, high power THz
generation, and filamentation. The scalability both in power and focal
dimensions is an important problem for all of these applications. For
example, higher powers ignite nonlinear propagation effects that
dynamically reshape the wave packet. Likewise, diffraction dominates
when the focal voxel dimensions become comparable to the wavelength.
On the other hand, the use of shaped optical wave packets can, in
principle, enable us to control the intensity distribution and the focus
position in the linear and the non-linear propagation regimes. An ideal
template for this tailored control is the recently introduced family of
accelerating optical wave packets, whose distribution is described by
the Airy function. These wave packets propagate in curved trajectories,
exhibit abrupt autofocus and are able to self-heal and bypass obstacles.
Furthermore, at high intensities they reshape into nonlinear intense
light-bullets with extremely well defined focal position.
This talk will focus on the open challenges and the latest advancements
in the field, which among others include the revealing of the “Janus”
nature of this family, and the surprising “phase memory” during harmonic
generation. Additionally, we will discuss on how these advancements have
enabled the use of shaped optical wave packets in a plethora of
applications in the linear and non-linear propagation regimes.
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April 2018
