Transcript DG Papazoglou et al.

Dimitris Papazoglou
Assistant Professor ,
Affiliated faculty IESL-FORTH
Senior member of the UNIS group
PhD: 1998, Aristotle University of Thessaloniki, Physics
General research area: Optics (experimentalist)
Bibliometric info: 42 publications, 304 citations, h factor: 11
Research activity is taking place in IESL-FORTH facilities
Ultra-intense nonlinear interactions and sources (UNIS) lab
Research activities
Nonlinear interactions of ultra-short laser
pulses with transparent media
Exotic optical waves and light bullets
Wavefront sensing and manipulation
Active collaborations
Stelios Tzortzakis (IESL-FORTH)
Nikos Efremidis (UOC)
George Stegeman (CREOL)
Demetrios Christodoulides (CREOL)
Photonic structuring in transparent media
Physical
mechanism ?
Thermal
process
Photochemical
process
By in-situ studying the
spatiotemporal dynamics we
are lead to a better
understanding of the physical
process.
Our results clearly support a
photochemical mechanism
for low repetition rate laser
sources!
D.G. Papazoglou et al., Opt. Lett. 31, 1441 (2006) ,
D. G. Papazoglou et al., Opt. Lett., 32, 2055 (2007),
D.G. Papazoglou et al., (invited) to appear in Optical Materials Express (2011)
Most of the
experimental results
were inconclusive
since they were based
on the post
processing of the
samples
i-HOM (In-line holographic microscopy)
High resolution pump-probe experimental technique that is capable of resolving
small refractive index changes (~ 10-4 ) in m sized focal volumes
Spatial distribution of the perturbed refractive index
and respective electron density in a central
longitudinal section of a plasma string formed in air
D.G. Papazoglou et al, Appl. Phys. Lett., 93, 041120 (2008)
Using coma aberration to generate intense Airy beams
cubic phase
modulation
Airy beams are a nondispersive solution of
the 1D paraxial
propagation equation
G. A. Siviloglou, et al., Phys. Rev. Lett., 99, 213901 (2007)
Optical aberrations can be envisioned as a way to impose
polynomial phase distributions on plane wave!
Coma aberration 
Cubic phase !
D. G. Papazoglou, et al., Phys. Rev. A, 81, 061807(R) (2010)
Spatiotemporal Airy Light Bullets in the Linear and
Nonlinear Regimes
By combining a spatial Airy beam with an Airy pulse in time we have
generated intense Airy-Airy-Airy (Airy3) light bullets
The Airy3 light bullets do not require any specific
tuning of the material optical properties for their
formation and withstand both diffraction and
dispersion during their propagation.
The Airy3 light bullets are robust up to the high
intensity regime since they are capable of selfhealing the nonlinearly induced distortions of their
spatiotemporal profile
Spatiotemporal self healing of the Airy3 light bullet
D. Abdollahpour, et. al. Phys. Rev. Lett., 105, 253901 (2010)
Intensity iso-surface of the experimentally realized
Airy3 light bullet