Linear astigmatism of a confocal off-axis reflective imaging system when the object plane is tilted and located at a finite distance from the imaging system is derived. We show that linear astigmatism can be eliminated by proper configuration of the parent mirror axes in confocal off-axis two-mirror systems. The tilt angle of the image plane is also derived. The developed theory is verified by ray-tracing analysis of an example system.
© 2006 Optical Society of America
Optical Design and Fabrication
Seunghyuk Chang, Jung Hoon Lee, Suk Pil Kim, Hun Kim, Won Joo Kim, Ihun Song, and Youngsoo Park, "Linear astigmatism of confocal off-axis reflective imaging systems and its elimination," Appl. Opt. 45, 484-488 (2006)