Hollow Retroreflector, Broadband, 63.5 mm, 5 arc sec, 450-10,000 nm

Hollow retroreflectors offer advantages of more accurate parallelism, ability to accommodate larger beam diameters, and better preservation of polarization compared to solid glass retroreflectors. Our UBBR1-1 hollow retroreflectors provide as low as 1 arc sec return beam accuracy, compared to 2 arc sec provided by our BGR solid glass retroreflectors. The UBBR2.5 hollow retroreflectors' 2.5-in. (63.5-mm) aperture is larger than typical solid glass retroreflectors' diameters. Polarized light traveling through solid glass can result in unpredictable polarization, whereas reflected light from a metallic coating traveling through air in a hollow retroreflector tends to have its polarization preserved better. Finally, for psec and fsec ultrashort pulses, hollow retroreflectors introduce much lower dispersive effects compared to solid glass.