Optical true-time-delay devices based on the White cell can be divided into two general types: polynomial cells, in which the number of delays that can be obtained is related to the number of times <i>m</i> that a beam bounces in the cell raised to some power, and exponential cells, in which the number of delays is proportional to some number raised to the power of <i>m</i>. In exponential cells, the topic to be addressed, the spatial light modulator switches between a delay element and a null path on each bounce. We describe an improved design of this switching engine, which contains a liquid-crystal switch and a White cell. We examine astigmatism and corrections for it and present a specific design.
© 2003 Optical Society of America
(070.1170) Fourier optics and signal processing : Analog optical signal processing
(200.4740) Optics in computing : Optical processing
(220.1000) Optical design and fabrication : Aberration compensation
(230.3720) Optical devices : Liquid-crystal devices
(280.5110) Remote sensing and sensors : Phased-array radar
Richard Higgins, Niru K. Nahar, and Betty Lise Anderson, "Design and Demonstration of a Switching Engine for a Binary True-Time-Delay Device that Uses a White Cell," Appl. Opt. 42, 4747-4757 (2003)