[Blueboard] Ateneo Physics News

Quirino Jr. M. Sugon qsugon at ateneo.edu
Wed May 3 12:11:33 +08 2017


The Department of Physics of Ateneo de Manila University cordially invites
you to a dissertation defense:

PhD Physics Candidate: Alvie Asuncion
Schedule and venue: May 4, 4 PM, F106

Dissertation panel:

Dr. Raphael A. Guerrero (Physics), Dissertation Adviser
Dr. Paul Leonard Atchong C. Hilario (UPD), Dissertation Examiner
Dr. Marienette Vega (Physics), Dissertation Examiner
Dr. Mikaela Irene D. Fudolig (Physics), Dissertation Reader
Dr. Joel T. Maquiling (Physics), Dissertation Reader


Superimposed Bessel beams (SBBs), which exhibit periodic behavior along the
propagation axis, have been found useful in optical micromanipulation, atom
trapping, laser drilling and other applications. The oscillating core
diameter of such beams gained attention due to a pre-defined longitudinal
pattern, which can be modified by varying certain experimental parameters.
In this study, photorefractive volume holography is employed to generate
SBBs with tunable periodicity. This is performed by using an
axicon-telescope (a-t) system to generate quasi-Bessel beams (QBBs) with
different transverse profiles corresponding to different cone angles. The
generated QBBs are recorded as a thick hologram in a LiNbO3 photorefractive
crystal. Stored holograms were considered as equivalent to a volume
holographic axicon that effectively transforms the profile of Gaussian
readout beams into QBBs.  Retrieved QBBs from the crystal are focused by
the original axicon to produce SBBs.  Results show that both the QBB
profile and the SBB period can be tuned by simply varying the a-t distance
*d*.  SBB oscillation periods that range from 4.3 cm to 6.1 cm were
obtained.  The method presented in this study allows tunability of SBB
period through a simple rearrangement of optical elements.

Dr. Quirino Sugon Jr.

Assistant Professor, Department of Physics, Ateneo de Manila University (on
Program Manager, Upper Atmosphere Dynamics, Manila Observatory (on leave)
Associate Professor, International Center for Space Weather Science and
Education, Kyushu University
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