Optical Surfaces’ (Surrey, UK) beam expanders incorporate off-axis mirrors which provide an unobstructed output and highly efficient transmission. Beam expanders are the optical tool of choice for increasing the diameter of a collimated input beam to a larger collimated output beam. Beam expanders are used in applications such as, high power lasers, laser scanning, interferometry, LIDAR systems and remote sensing. Available in standard (5x, 10x, 15x and 20x fixed magnification) or customer specified (fixed or variable magnification) configurations, each OSL beam expander is supplied housed in an aluminum housing with provision for fixing to an optical table.