The assembly of two or more optical components such as lenses, windows, mirrors, or filters into a common mechanical surround generally involves multiple applications of the basic mounting techniques discussed in Chapter 3. Here, we discuss several technical aspects unique to multiple-component optical assemblies. Topics include the design and fabrication of spacers that are commonly used to separate adjacent components in a mount; assembly techniques (drop in, lathe, poker chip, and modular) that provide varying degrees of control over intercomponent alignment; techniques for sealing and purging completed assemblies; and mechanisms for moving one or more lenses relative to other optics for focus adjustment, focal length variation, magnification change, etc. Numerous examples of hardware designs illustrate the various types of construction. Methods and instrumentation for precision alignment of multiple refracting and reflecting components are discussed in Chapter 12.
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