Mielenz K D
Appl Opt. 1974 Nov 1;13(11):2580-4. doi: 10.1364/AO.13.002580.
Cassegrainian-type reflecting objectives are useful as in-line imaging devices for fast spectrometer systems. They are inherently free from chromatic aberrations and may be corrected for spherical aberration. A particularly simple design, consisting of two mirrors with oppositely equal curvatures, is possible when unit magnification is desired. This system has zero third-order spherical aberration, and all other aberrations are small also. Its main disadvantage is the loss due to the central obstruction of the beam, amounting to about 28% exclusive of reflection losses. The author is with the Analytical Chemistry Division, National Bureau of Standards, Washington, D.C. 20234.
卡塞格伦型反射物镜作为快速光谱仪系统的同轴成像装置很有用。它们固有地不存在色差，并且可以校正球差。当需要单位放大率时，一种特别简单的设计是可能的，它由两个具有相反相等曲率的镜子组成。该系统具有零三阶球差，并且所有其他像差也很小。其主要缺点是由于光束的中心遮挡而导致的损失，不包括反射损失时约为28%。作者隶属于美国国家标准局分析化学部，华盛顿特区20234。
