Collimator for fiber optics
GRIN
Thorlabs
GRIN lenses are typically used in fiber-based passive and active components for coupling laser light from one fiber through a free space optical system, such as an optical isolator, and back into fiber to propagate through the rest of the system. GRIN lenses can also be used for coupling laser diodes into fiber, coupling laser light onto a detector, and focusing/collimating laser light.
