Adaptive helical mirror for generation of optical phase singularity.
We report a specially designed adaptive mirror that can be bent into a helical shape for generation of an optical phase singularity. The adaptive helical mirror (AHM) reported here is a reflective device that can provide a continuous phase variation of the optical field in the azimuthal direction. The construction details and evaluation of the AHM are presented. A Michelson interferometer is used for the detection of the phase singularity. The AHM can be used for generation of a singular beam having multiple topological charges, positive or negative, just by controlling the excitation voltage of the AHM.
Ghai
Devinder Pal
DP
Department of Physics, Indian Institute of Technology Delhi, New Delhi, India. dpghai@yahoo.co.in
Senthilkumaran
P
P
Sirohi
R S
RS