Consisting of 2 optical components cemented together to form doublet, TECHSPEC® YAG-BBAR Coated Achromatic Lenses provide alternative to air-spaced focusing doublets. Lenses are available in 12 models with diameters from 6.25–25 mm and focal lengths from 12.5–200 mm. With surface quality of 40-20, units are optimized for less than 0.25% absolute reflectivity at 532 nm and 1,064 nm. Lenses can be used to focus Nd:YAG lasers and correct on-axis spherical and chromatic aberrations.