The design of a desired optical transfer function (OTF) is a common problem that has many possible applications. A well-known application for OTF design is beam shaping for incoherent illumination. However, other applications such as optical signal processing can also be addressed with this system. We design and realize an optimal phase only filter that, when attached to the imaging lens, enables an optimization (based on the minimal mean square error criterion) to a desired OTF. By combining several OTF design goal requirements, each represents a different plane along the beam propagation direction, an imaging system with an increased depth of focus is obtained. Because a phase only filter is used, high energetic efficiency is achieved.
© 2003 Optical Society of America
Original Manuscript: August 13, 2002
Revised Manuscript: December 16, 2002
Published: April 10, 2003
Dina Elkind, Zeev Zalevsky, Uriel Levy, and David Mendlovic, "Optical transfer function shaping and depth of focus by using a phase only filter," Appl. Opt. 42, 1925-1931 (2003)