OPTICAL FIBER AND LASER OSCILLATOR USING SAME

摘要

An optical fiber (6) includes a first optical fiber body (61), a second optical fiber body (62) and a first end cap (63). The first optical fiber body (61) includes a first core (611) and a first cladding (612) . The second optical fiber body (62) includes a second core (621) and a second cladding (622), and is joined at a first end surface (623) thereof to a first end surface (613) of the first optical fiber body (61). The first end cap (63) has light permeability and is joined to a second end surface (624) of the second optical fiber body (62). The first core (611) is doped with a laser medium. A mass content of the laser medium in the second core (621) is lower than that of the laser medium in the first core (611).