The LC-1 fibre optic input coupler is a convenient way to launch a free-space CW laser beam into an optical fibre. It includes focusing and alignment optics, a 1″-diameter mounting disk, and a 9 μm core-diameter fibre that is terminated with an FC/UPC or FC/APC connector.
A well-collimated laser beam enters the aperture in the centre of the mounting disk and is focused into the fibre. Built-in optics provide two slightly off-axis back reflections to facilitate alignment using a standard two-axis angular optical mount.