Stabilization of diode laser output by beveled-end fiber coupling

A new laser-to-fiber coupling scheme, which eliminates unstable phenomena caused by optical feedback, is proposed and demonstrated experimentally. This coupling module contains a packaged diode laser, two lenses, and a beveled-end fiber. Depending on the beveled angle, the reflected light beam from the fiber will be displaced with respect to the emitted light beam at the laser facet, and stabilization of laser output power and spectrum are achieved.