Patent ID: 9031098
Filing Date: 2015-05-12
Classification: H01S

Abstract:
1. An all fiber passively Q-switched laser comprising: a large core doped gain fiber having a first end and a second end opposite the first end, the large core doped gain fiber having a first core diameter; a doped single mode fiber having a second core diameter that is smaller than the first core diameter, the doped single mode doped fiber configured as a saturable absorber and having a first end and a second end opposite the first end; a mode transformer directly coupled to the second end of the large core doped gain fiber and to the first end of the doped single mode fiber, the mode transformer having a core diameter that transitions from the first core diameter to the second core diameter such that the mode transformer is configured to filter out light modes not supported by the doped single mode fiber; and a single laser cavity formed between a first reflector positioned adjacent to the large core doped gain fiber and a second reflector positioned adjacent to the doped single mode fiber, wherein an output light beam of the all fiber passively Q-switched laser passes through the first reflector.