Explore 28 top manufacturers and suppliers of Fiber Optic Collimators in our comprehensive photonics buyers' guide. In practice, “perfect” collimation is limited by fundamental diffraction. ©2025 Newport Corporation. The coupling units developed by Laser Components for the UV-NIR and CO 2 wavelengths can also be used in reverse direction as collimators. The lenses are diffraction limited, so they can achieve spot sizes down to a few microns.