These 0.5 NA gradient-index microlenses are obtained by drawing the fiber-optic preform with radial refractive-index distribution and specific refractive-index profile into small diameter rods. The focal length and working distance of these fiber lenses is a function of their diameter. They are perfectly suited for fast axis collimation of laser diodes.
Cylindrical rod lenses are highly polished small diameter rods made of optically transparent homogeneous materials. A carefully controlled manufacturing process produces rods (or fibers) with precise diameters and unsurpassed surface quality.