A generalized model of a double-wedge phase element containing two side-by-side parallel phase ramps with arbitrary slope angles is proposed. We study the diffracted optical field of a double-wedge element in terms of orbital angular momentum states. Analytical calculations reveal how the radius and position of the illuminating laser beam affect the composition of orbital angular momentum generated by the phase wedges.
© 2007 Optical Society of America
Diffraction and Gratings
Original Manuscript: April 3, 2007
Revised Manuscript: May 24, 2007
Manuscript Accepted: May 27, 2007
Published: July 23, 2007
J. Lin, X.-C. Yuan, J. Bu, H. L. Chen, Y. Y. Sun, and R. E. Burge, "Generalized model for orbital angular momentum states generated by parallel aligned phase wedges," Opt. Lett. 32, 2170-2172 (2007)