Abstract

A diffractive lens that produces a focal point with a null in the center is presented. This is achieved with the aid of a phase singularity, which is produced by a branch point in the transmission function of the diffractive lens.

© 1993 Optical Society of America

Diffraction-free beams generated with programmable spatial light modulators

Jeffrey A. Davis, Jarod Guertin, and Don M. Cottrell
Appl. Opt. 32(31) 6368-6370 (1993)

Measurement of the numerical aperture and f-number of a lens system by using a phase grating

F. Lei and L. K. Dang
Appl. Opt. 32(28) 5689-5691 (1993)

Optimizing the kernel for laser diffraction particle sizing

Y. C. Agrawal and H. C. Pottsmith
Appl. Opt. 32(22) 4285-4286 (1993)

Least-squares estimators for the center and radius of circular patterns

Alberto Cordero-Dávila, Octavio Cardona Nuñez, and Alejandro Cornejo-Rodríguez
Appl. Opt. 32(28) 5683-5685 (1993)

Double slit with continuously variable width and center-to-center separation

H. K. Pak and Seung-Han Park
Appl. Opt. 32(19) 3596-3597 (1993)