OPTICAL FIBER AND LASER OSCILLATOR USING THE SAME

摘要

PROBLEM TO BE SOLVED: To mitigate the damage to an optical fiber end portion.SOLUTION: An optical fiber 6 includes a first optical fiber main body 61, a second optical fiber main body 62 and a first end cap 63. The first optical fiber main body 61 has a first core 611 and a first cladding 612. The second optical fiber main body 62 has a second core 621 and a second cladding 622, and a first end face 623 of the second optical fiber main body is joined to a first end face 613 of the first optical fiber main body 61. The first end cap 63 transmits light and is joined to a second end face 624 of the second optical fiber main body 62. The first core 611 is doped with a laser medium. The mass content of the laser medium in the second core 621 is lower than the mass content of the laser medium in the first core 611.