C-lens C-lens is a columnar optical microlens with radial gradient refractive index distribution. It is widely used in collimator, isolator, optical switch, collimator array and laser component. Compared with other self-focusing lenses, C-lens has many advantages, including low cost, low insertion loss, and a wide working range. PWT can provide custom-designed adhesive C-Lenses according to different customer requirements.   Specification： Material： Dimensional tolerance： Surface flatness： Surface quality： Centration:： Coating: Optical glass -0.01/-0.03mm N=3Fr 40-20 <5’ AR or upon request