Laser Beams with Phase Singularity
Dr. Yoko Miyamoto
Department of Information and Communication Engineering, The University of ElectroCommunications, Japan
2.30pm, Wednesday 2 May 2001, Virtual Reality Theatre (AS406), Applied Sciences Building
A phase singularity is a structure in a complex field such that integration of the phase gradient along
a closed path around it yields 2mp, where m is an integer and called the charge of the phase singularity. Using an electronbeam
lithography technique, we have fabricated transmission and reflection holograms that generate phase singularities when illuminated
with a laser beam. The resulting phase distribution was examined in detail, and it was found that in all of the cases phase
singularities with m > 1 had split into m individual charge1 singularities. The phenomenon was analyzed through numerical
simulation and experiment to show that astigmatic aberration can play an important role.
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