Fiber laser e.g. ytterbium-doped fiber laser used in e.g. communication field, has positive-negative (PN) layer that is provided between outer casing and semi-reflecting layer that is provided around the active core

摘要

The fiber laser (1) has an outer casing (2) made of metal, whose inner side is provided with an active core (5). A positive-negative (PN) layer (3) is provided between outer casing and a semi-reflecting layer (4) that is provided around the active core. The semi-reflecting layer is made of indium tin oxide.