Collimator Lens EFL 4.02mm is a high-precision optical component engineered to convert divergent light from laser diodes into a parallel beam. The short effective focal length (4.02mm) allows compact integration in miniaturized optical modules. It is manufactured using high-grade optical glass with strict surface accuracy and anti-reflection coatings to reduce optical loss. These lenses are widely used in laser modules, fiber coupling systems, optical sensors, and imaging devices. Their optical design ensures efficient beam shaping and stable output in small-scale systems.