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Laser Optics & Photonics and Atomic & Plasma Science 2018
J u l y 1 6 - 1 7 , 2 0 1 8
P r a g u e , C z e c h R e p u b l i c
Page 49
American Journal of Computer Science and Information Technology
ISSN: 2349-3917
E u r o S c i C o n J o i n t E v e n t o n
Laser Optics & Photonics and
Atomic & Plasma Science
Measurement of tilt or roll angle with high accuracy is required for a
variety of engineering and scientific applications. A cyclic interferometer
was shown to be more suitable than and twice as sensitive as conventional
two beam interferometers for such measurements. Incorporating the idea
of multiple reflections along with polarization phase step tilts in the order
of 0.2 nano-radians were measured with a four phase step method. This
interferometer, unlike conventional interferometers, has been shown to be
insensitive to external vibrations. This stability was tested using extended
time-scale measurements of tilt. Results show that the interferometer has
good stability for measurements over time. We also show in this paper
that spatial phase step routine with an unknown phase step can be used to
determine tilts of a few nano-radians. In this technique, the phase map can
be extracted and thus the tilt using only a single fringe pattern unlike the
four phase step method. Further, we will discuss the concept of developing
a compact cyclic interferometer to be used to calibrate an autocollimator for
mirror shape metrology.
Biography
C Joenathan received his PhD in the area of Optics from IIT
Madras in 1986. Presently, he is a Professor of Physics and
Optical Engineering at Rose-Hulman Institute of Technology,
USA. He was previously the Department Head of the Physics
and Optical Engineering for 16 years. He is a fellow of OSA, OSI,
and SPIE. He has published over 120 refereed articles in the field
of Holography and Speckle Applications, HOE, and ESPI. He
was instrumental in getting optical engineering program to be
part of ABET. He is the Associate Editor for Optical Engineering.
Nano scales tilt measurement using a cyclic interferometer:
new developments
C Joenathan1 , A Bernal1 , Kashmira Tayabaly2 , Joseph Porter1,
Mourad Idir2 and Lei Huang2
1Rose-Hulman Institute of Technology, USA
2Brookhaven National Laboratory, USA
C Joenathan et al., Am J Compt Sci Inform Technol 2018, Volume 6
DOI: 10.21767/2349-3917-C1-002