The 34-161 from Edmund Optics is a laser line coated fused silica plano convex lens having a design wavelength of 1550 nm. The lens has an effective focal length of 100 mm and a back focal length of 98.33 mm. It has a suface accuracy of λ/4 with maximum reflection of less than 0.25% at 1550 nm. The lens has a diameter of 12 mm and is ideal for for applications utilizing low power HeNe, Diode, and Nd:YAG laser sources.