HIGH POWER METAL CLAD MODE ABSORBER

摘要

A clad absorber unit is provided on a passive fiber of a high power fiber laser system and operative to trap and remove high order modes propagating along the clad of the passive fiber. The mode absorber has a composition made from one or more liquid metals and alloys thereof which are placed in the opening formed in the sheath of the passive fiber. The composition is configured to remove from the cladding the MM light having a predetermined light power which heats the composition at a temperature lower than a threshold temperature at which the absorber may be damaged.

主权项

1. A clad mode absorber unit (“CMA”), comprising:
a passive fiber provided with a core, a cladding surrounding the core and capable of supporting an undesirable multimode (“MM”) clad light, and a polymeric sheath coated upon the cladding, the sheath having a discontinuous surface which defines an opening terminating in a plane of the cladding; and an absorber covering an exposed portion of the cladding within the opening and having a composition which is selected from the group consisting of liquid metals and liquid metal alloys and a combination thereof, the composition being configured to remove the MM light having an optimal light power that heats the composition at a temperature lower than a threshold temperature at which the absorber is damaged.