Phase-only elements are generally more desirable than complex-amplitude-modulated elements not only because of the higher diffraction efficiency but the readier implementation and fabrication. A novel iterative algorithm is proposed for generating multiple helical modes by a single phase-only element. A superposition of four helical modes is demonstrated experimentally by using a spatial light modulator.
© 2006 Optical Society of America
Lasers and Laser Optics
Original Manuscript: August 12, 2005
Revised Manuscript: October 30, 2005
Manuscript Accepted: November 3, 2005
Jiao Lin, Xiaocong Yuan, Shaohua H. Tao, and Ronald E. Burge, "Synthesis of multiple collinear helical modes generated by a phase-only element," J. Opt. Soc. Am. A 23, 1214-1218 (2006)