Propagation of Gaussian Beams Through a Modified von Karman Phase Screen

Gaussian beam propagation through discrete phase screens and an extended random media has been studied extensively over the last four decades. In this thesis, we numerically examine the effects of a discrete phase screen during Gaussian beam propagation on the scintillation index for a single beam and on the fringe visibility for the two transversely separated beams. We use the modified von Karman spectrum model to describe the phase screen statistics, utilizing the Fried parameter, inner scale and the outer scale. The scintillation index is analyzed as a function of the structure constant, phase screen location, the initial width of the Gaussian beam, etc. Similarly, the numerical simulations are extended using a pair of transversely separated Gaussian beams. We examine the interference of the beams and measure the fringe visibility at the target. We then correlate the scintillation index and the fringe visibility results and suggest the possible applications.

Name thesis:degree_name

Master of Science (M.S.)

Level thesis:degree_level

masters

Discipline thesis:degree_discipline

Electro-Optics

Grantor dc:publisher

University of Dayton

Year dc:date

2012

Author dc:creator

• Whitfield, Erica Marie

Contributors dc:contributor

• Banerjee, Partha P.

• Optics
• Modified Von Karman
• Phase Screen
• Gaussian Beam Propagation
• Fringe Visibility
• Scintillation Index

Statement dc:rights

• unrestricted
• This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.

Language dc:language

English

Repository record dc:identifier

http://rave.ohiolink.edu/etdc/view?acc_num=dayton1355513250

OAI identifier oai:identifier

oai:etd.ohiolink.edu:dayton1355513250