LASER

摘要

A high power monomode laser arrangement is able to manipulate the output from a high power laser diode array pump source (3) using a computer-generated hologram (4) to launch a high proportion of the pump source light into a multimode fibre portion including input reflector (6). A monomode fibre portion (2) with the same fundamental-mode spot size as the multimode fibre portion (1) is optically coupled to the multimode fibre portion and includes a reflector (5) which reflects only the fundamental mode of the multimode and monomode fibre portions. The fundamental mode reflection forced by the monomode fibre portion (2) provides the feedback necessary to force predominantly fundamental mode oscillation which enables stimulated emission in only the fundamental mode.