Patent ID: 9627839
Date: 2017-04-18
CPC Classifications: G02F,H01S

Claim:
1. A device comprising: a portion of optical fiber providing an amplifying medium; a first resonant cavity containing the portion of optical fiber and having a frequency selective element which limits the frequency band of the first resonant cavity to cover a subset of axial modes of the first resonant cavity; a second resonant cavity arranged in the first resonant cavity and having a transmission response that includes a plurality of transmission bands within the frequency band of the first resonant cavity, so that there are a plurality of axial modes which lie within both the frequency band of the first resonant cavity and at least two of the transmission bands of the second resonant cavity, wherein the second resonant cavity is configured to increase intracavity power within the second resonant cavity to a power output that is higher relative to a power outputted from the optical fiber, and wherein the second resonant cavity includes a plurality of mirrors arranged within the second resonant cavity for circulating light received from the first resonant cavity within the second resonant cavity, at least one of the plurality of mirrors being curved; a pump source having an output directed to excite light within the first frequency band from the amplifying medium and induce lasing at multiple ones of said plurality of axial modes that lie within both the frequency band of the first resonant cavity and the transmission bands of the second resonant cavity, wherein the second resonant cavity has arranged therein a non-linear optical medium which supports a frequency mixing process in the second resonant cavity.