SELFOC® Laser Diode Collimating Lenses SELFOC® Collimating Lenses are designed to be compatible with CD lasers and other types of packages. They are commonly used in laser beam printers, bar code scanners and sensors. The cylindrical shape of the lens allows it to be easily aligned and mounted. The Pick-Up Lens (SPL) is mounted in an anodized aluminum holder. Advantages Controlled Wavefront Aberration Compact Low Cost Singlet Construction Simplified Mounting Proper handling and storage of lenses.   Table 1 Specifications Part # SPL AG3645-2 SLW 300-011-078 SLW 400-011-078-C20 ZGI-CL 120-140-450 Features/ Remarks Mounted on aluminum holder AR coating optional Large diameter Long focal length, large diameter Lens Type Radial Gradient Plano-Convex Radial Gradient Plano-Plano Radial Gradient Plano-Plano Axial Gradient Plano-Convex Wavelength* 780 nm 780 nm 780 nm 633 nm AR Coating C2 coating Optional C2 coating C2 coating Lens Diameter 4.0 +0/-0.02 mm 3.0 +0/-0.02 mm 4.0 +0/-0.02 mm 4.5 mm +0/-0.1 mm Effective Dia. (Deff) 3.3 mm 1.8 mm 2.5 mm 3.4 mm Lens Length Holder length 3.35 mm 3.35 +/- 0.2 mm 4.2 +/- 0.2 mm 1.3 +/- 0.1 mm @center Working Distance 2.7 mm from holder end 3.7 mm 5.4 mm 11.2 mm Effective Focal Length 3.6 mm 5.0 mm 7.1 mm 12.0 mm N.A. on axis --- 0.46 0.46 ---   at Deff 0.45 0.18 0.18 0.14 Wavefront Aberr.** l/4 typical at Deff l/4 max. at Deff l/4 max. at Deff l/4 max. at Deff * Lenses designed for 780 nm are suitable for 670 nm applications as well. ** Wavefront aberration is measured at 633 nm. Note: Consult NSG Europe for details on surface quality. Note: Consult NSG Europe for details on surface quality.