IEEE Photonics Society student chapter Seminar: "Can
fibers replace all (most) lasers? ---Nonlinear Optics with Bessel Beams in
Fibers" by Dr. Siddharth Ramachandran
Thursday, March 27, 2014 2:00 PM to 3:00 PM
CREOL Room 102
CREOL Room 102
Dr. Siddharth Ramachandran
Electrical Engineering Department, Boston University, Boston
Bessel beams have generated widespread interest over the
last two decades because of intriguing properties such as their
diffraction-resistant nature and the ability to navigate (self-heal) past
opaque obstructions. In fibers, they exist as higher order modal solutions of
the waveguide. While the fact that such beams theoretically exist in fibers is
well-known from any waveguides textbook, only recently was it realised that,
over lengths as long as 10-100 meters, beam stability in a fiber actually
increases with mode order, for the sub-class of azimuthally symmetric fiber
modes (i.e. for modes whose field is described by the J0 Bessel function).
This counter-intuitive finding has significant implications
for mode area, and hence power scaling with optical fibers. More generally, and
perhaps more interestingly, this results in the fiber as a nonlinear medium
with dramatically enhanced degrees of freedom for phase matching. This talk
will describe the physics of Bessel beam generation and propagation in fibers,
and their implications for a novel degree of freedom in nonlinear topics, which
lead to applications in fields as disparate as quantum-optics, deep-tissue imaging
and high-power lasers.
Biography:
Dr Siddharth Ramachandran obtained his Ph.D. in Electrical
Engineering from the University of Illinois, Urbana-Champaign, in 1998.
Thereafter, he joined Bell Laboratories as a Member of Technical Staff and
subsequently continued with its spin-off, OFS Laboratories. After a decade in
industry, Dr. Ramachandran moved back to academics in 2010, and is now a
Professor in the Department of Electrical Engineering at Boston University.
Prof. Ramachandran's research focuses on the optical physics
of guided waves. He has authored over 200 refereed journal and conference
publications, more than 45 invited talks, plenary lectures and tutorials, 3
book-chapters, edited one book, and has been granted 37 patents. For his
contributions in the field of fiber-optics, he was named a Distinguished Member
of Technical Staff at OFS Labs in 2003, a fellow of the Optical Society of
America (OSA) in 2010, and an IEEE Distinguished Lecturer for 2013-2014. He
served as a topical editor for Optics Letters from 2008-2011, and is currently
an associate editor for the IEEE Journal of Quantum Electronics, in addition to
serving on numerous conference and grant-review committees in the field of
optics and applied physics.
For additional information:
IEEE Photonics Society Student Chapter Chair: Zhenyue Luo zhenyueluo @ creol . ucf . edu
IEEE Photonics Society Student Chapter Advisor: Prof.S.T.Wu swu @ ucf . edu
No comments:
Post a Comment