An optical fiber assembly includes a clad optical fiber having an end-cap
thereon. Radiation is focused into the optical fiber via the end-cap. A
roughened portion of the fiber cladding behind the end-cap allows any
radiation focused into the fiber and propagating in the cladding to
escape the optical fiber. A concave reflector surrounding the optical
fiber reflects the escaped radiation away from the fiber assembly. A
connector for connecting the optical fiber to a laser includes an
air-cooled beam-dump for receiving the radiation reflected away from the
optical fiber.