Reflective Beam Expanders are mirror-based beam expanders, offering either expansion or reduction. Due to dispersion, lens-based beam expanders are only capable of compensating for focus at one wavelength of light, making them only suitable for expanding/reducing monochromatic sources. Reflective beam expanders use mirrors which have constant focal lengths, regardless of the light being focused. Thus, reflective beam expanders can be used with collimated polychromatic light without the need of any fine focus adjustment.
Haas part number RBEC-38-1.4-10.6 shown above. Download technical drawings for each stock part number on the right. Download free Adobe PDF reader and SolidWorks Viewer on the left.