Improved expressions are given for the performance parameters for transverse and axial gains for complex pupil filters. These expressions can be used to predict the behavior of filters that give a small axial shift in the focal intensity maximum and also predict the changes in gain for different observation planes.
© 2007 Optical Society of America
Original Manuscript: February 27, 2007
Revised Manuscript: April 3, 2007
Manuscript Accepted: April 6, 2007
Published: June 6, 2007
Colin J. R. Sheppard, Silvia Ledesma, Juan Campos, and Juan C. Escalera, "Improved expressions for performance parameters for complex filters," Opt. Lett. 32, 1713-1715 (2007)