Download or read book Design Methods for Two Regimes of Unobscured Reflective Optical Systems written by Eric M. Schiesser and published by . This book was released on 2019 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Unobscured reflective optical systems require unique optical design techniques due to their lack of rotational symmetry. The aberrations introduced to avoid obscuration can be understood in the context of Nodal Aberration Theory (NAT), which describes the way optical aberrations add when components are tilted and decentered relative to their axes of symmetry. In this work, we will explore the design methods for two types of unobscured reflective optical systems: a high-power laser image relay and a wide field-of-view telescope. The requirements of each of these optical systems place them in different design regimes, each requiring unique design techniques to achieve adequate performance. The laser image relay, which is designed for an upgrade to the Multi-terawatt Optical Parametric Amplifier Line (MTW-OPAL) at the Laboratory for Laser Energetics (LLE), can be achieved with traditional off-axis conics or spherical mirrors. Two design approaches for this relay will be explored: an axi-symmetric series of off-axis conics and a series of tilted spherical mirrors. On the other hand, the wide field-of-view telescope requires the use of freeform optics for adequate correction. To aid in its design, we extend the NAT astigmatism terms to 8th order to ascertain the higher-order field dependence of the Zernike astigmatism aberrations, and then use this field-dependence to estimate the surface coefficients required to simultaneously correct certain low-order aberrations according the aberration theory of freeform surfaces (ATFS). Finally, we show the quantitative effect of freeform surfaces on the volume and performance of a three-mirror telescope design type called the three-mirror compact (TMC)"--Page x.