Focus-corrected optical filter apparatus for multi-wavelength optical systems

A focus-corrected optical filter apparatus includes a plurality of optical filter assemblies supported by a movable support member. Each optical filter assembly includes an optical filter and a corrector that form a filter-corrector pair that moves with the support member. Each corrector is shaped to compensate for the adverse effects of chromatic aberration of the focus lens at a given wavelength of a corresponding optical filter in the filter-corrector pair. The example corrector is a flat glass sheet having different thicknesses. The focus-corrected optical filter arrangement is arranged such that different optical filter components can be sequentially inserted into the optical path of a focused multi-wavelength light beam to sequentially form a substantially monochromatic focused light beam having different wavelengths but having the same focus position. 经焦点校正的光学滤波器装置包括由可移动支撑构件支撑的多个光学滤波器组件。每个光学滤波器组件包括光学滤波器和校正器，该光学滤波器和校正器形成与支撑构件一起移动的滤波器-校正器对。每个校正器形成为补偿在滤波器-校正器对中对应光学滤波器的给定波长处聚焦透镜的色差的不利影响。示例校正器是具有不同厚度的平板玻璃板。