New smaller diameter (25-60mm) Reflective Beam Expanders have been introduced by Optical Surfaces (OSL) for space restricted applications such as for high power lasers and multi-wavelength interferometry.
OSL reflective beam expanders are aspheric mirror-based devices offering either beam expansion or reduction capabilities. Incorporating high precision off-axis mirrors, OSL reflective beam expanders provide an unobstructed output and highly efficient transmission. They 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.
Available in standard (2.5x, 5x, 10x fixed magnification) or customer specified (fixed or variable magnification) configurations – OSL reflective beam expanders are designed to be easy to use and to provide accurate, unobstructed expansion/contraction of any collimated input light source.
Each beam expander is supplied housed in aluminium with provision for fixing to an optical table. Alignment aids are provided to ensure correct beam pointing. Manufactured to better than lambda/5 surface accuracy, the off-axis design of these reflective beam expanders produces no central obscuration and highly efficient transmission is obtained, unspoilt by spider diffraction patterns.