Patent ID: 9601894
Date: 2017-03-21
CPC Classifications: H01S

Claim:
1. A mode locked fibre laser comprising an optical cavity, wherein the optical cavity comprises: an optical fibre comprising a gain medium, a first optical fibre end, a second optical fibre end, and an optical fibre length; a first collimator, wherein the first collimator is configured to collimate light from the first optical fibre end; a second collimator, wherein the second collimator is configured to image light into the second optical fibre end; a free space optical path between the first collimator and the second collimator comprising a free space optical path length, wherein the free space optical path length is greater than the optical fibre length; a curved mirror within the free space optical path, wherein, at least one mode locking element optically coupled to the free space optical path.