Coherent optical feedback in the form of a simple confocal resonator has been used to solve partial differential and integral equations. However, due to aberrations, the simple feedback system has a limited space—bandwidth product. An attempt is made here to increase the space—bandwidth product and the accuracy of the optical solution by introducing optical elements with spherical surfaces and negative lens effects into the simple confocal system.
© 1983 Optical Society of America
Steve Johnston and Sing H. Lee, "Confocal optical feedback processing system: an improved optical design," Appl. Opt. 22, 1431-1438 (1983)