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Journal of Materials Science and Nanotechnology | Volume: 2
August 23-24, 2018 | Paris, France
Laser, Optics and Photonics
International Conference on
Vishwa Pal
Indian Institute of Technology Ropar, India
Degenerate cavity lasers and their applications
D
egenerate cavities are known from long time, but recently
these have attracted lot of attentions and exploited for
both practical applications as well as for the basic research.
Degeneratecavity lasers support anenormousamount of spatial
modes (~10^5), which are degenerate in losses and can lase
equally. These novel sources allowefficient controlling of spatial
coherence, where the number of spatial modes supported
by laser can be controlled from 1 to as many as 320,000.
Moreover, the output energy remains relatively constant over
the entire tuning range of spatial coherence. These were also
demonstrated for generalmanipulationof the spatial coherence
properties of the laser by resorting to more sophisticated intra-
cavity masks. These can be used for speckle-free wide field
imaging systems, dynamic multimodality biomedical imaging,
and can be employed in applications which require tailored
spatial coherence properties. Degenerate cavity lasers have also
shown an important method for generating and phase locking
large array of lasers in various network geometries. The phase
locking of large array of lasers can generate high powers with
tight focusing. For the basic research phase locked lasers serve
as a platform to investigate the behaviour of coupled nonlinear
oscillators and complex network dynamics. Large array of
coupled lasers has also exploited for simulating spin systems
and solving computationally hard problems. For example,
degenerate cavity lasers were shown to investigate geometric
frustration in the Kagome lattice, real-time wave front shaping
through scattering media by all-optical feedback and rapid
phase retrieval. In this talk I will present the experimental
and theoretical findings of degenerate cavity lasers and their
potential applications for both applied and basic research.
Speaker Biography
Vishwa Pal joined Indian Institute of Technology Ropar, India, as an assistant professor
of Physics in May 2018. He received his PhD degree in 2014 from School of Physical
Sciences, Jawaharlal Nehru University, New Delhi, India. He has done part of his
PhD at CNRS Laboratories Aime Cotton, Orsay, France. During his Ph.D. program,
he investigated semiconductor laser systems. After Ph.D., he received a 3-years
PBC fellowship for outstanding postdoctoral researcher by the Council for Higher
Education of Israel. In 2018, he joined CREOL, The College of Optics and Photonics,
Florida, USA, as a research scientist and worked on synthesizing non-diffracting optical
beams in free space by exploiting space-time correlations. In 2018, he also received
Marie Sklodowska-Curie Actions Individual Fellowship by European Commission.
e:
vishwa.pal@iitrpr.ac.in