Four-Spherical-Mirror Zoom Telescope Continuously Satisfying The Aplanatic Condition

On the dependence of the dynamic crack tip temperature fields in metals upon crack tip velocity and material parameters

“…Furthermore, the system is expensive if it is purchased commercially. There are several additional promising optical systems in the literature that provide a balance of the desirable features of both the Offner and the Cassegrain system(Rah and Lee, 1989, andEgdall, 1985). These systems use reflecting elements exclusively to eliminate chromatic aberration and have been corrected to produce almost diffraction limited performance.…”

Four-mirror optical system for UV submicrometer lithography

“…When they are inserted into Eqs. (8), (6), and (7) sequentially, the remaining design parameters of the system, C3, C4, and d3, are determined. Thus, by repeated application of this procedure to the proper range of do and d1, analytic solutions of the flat-field, anastigmatic, four-sphericalmirror system with reduction magnification (5 x ) are found.…”

“…Within third-order aberration theory, shifting the stop does not alter any aberration if the system is flat-field and anastig-13 Therefore, by placing the aperture stop of the system at the object side focus, we easily obtain a telecentric optical system in the image space. The design data of the system selected (8) from the Seidel solutions with good performances are listed in Table 1 , after shifting the stop. To meet our goal, the system 9 is scaled to have Cl -0.037522 cm and focal length f' ( ) = -10 cm with no optimization.…”