Cladding pumped fiber laser with reduced overlap between a laser mode and an ion-doped region

摘要

A cladding-pumped fiber laser has an optical fiber with a first end and a second end. The optical fiber has a core having an undoped central region and a collar surrounding the core. The collar is doped with a lasing dopant such as rare-earth ions. An inner cladding surrounds the core. A first grating is disposed at the first end of the optical fiber, and a second grating is disposed at the second end. Preferably, the first end has a higher reflectivity than the second end so that the second end acts as the output to the laser.