Adjustable spiral phase plate.
A spiral phase retarder phi(r, theta) = mtheta has been constructed with use of a deformed cracked plexiglass plate. By changing the degree of deformation, the retarder can be adjusted for use at any wavelength, and the value of the phase step 2pim at theta = 2pi can be chosen.
Rotschild
Carmel
C
Department of Physics, Technion-Israel Institute of Technology, 32000 Haifa, Israel.
Zommer
Shachaf
S
Moed
Shulamit
S
Hershcovitz
Oren
O
Lipson
Stephen G
SG