公开(公告)号：US11848539B2

公开(公告)日：2023-12-19

申请号：US17665566

申请日：2022-02-06

申请人： Georgios Margaritis

发明人： Georgios Margaritis

IPC分类号： H01S3/30 ,  H01S5/14 ,  H01S5/125 ,  H01S5/02251 ,  H01S5/024 ,  H01S5/06 ,  H01S5/12

CPC分类号： H01S5/146 ,  H01S5/141 ,  H01S5/147 ,  H01S5/02251 ,  H01S5/02415 ,  H01S5/0612 ,  H01S5/12 ,  H01S5/125 ,  H01S5/14

摘要： A novel narrow linewidth laser device is disclosed that includes a gain element, such as a quantum well, quantum dot or bulk waveguide laser chip and a fiber Bragg grating formed in an optical fiber positioned to receive the output from a first end of the gain element and return a portion of said output back into the gain element. The fiber Bragg grating is constructed so that its power reflectivity profile has a ratio of reflectivity slope over reflectivity at the 3 dB point below the reflectivity peak on the red side (longer wavelength side) of the grating larger than a value of 2/nm. The operating wavelength of the device may be tuned thermally, electrically, or thermo-electrically to be on the red side of the fiber Bragg grating reflectivity profile, preferably, but not necessarily, at the 3 dB point below the reflectivity peak or lower. In another embodiment, a second grating is optically coupled to a second end of the gain element and has a reflectivity profile that overlaps at least a portion of the reflectivity profile of the front end fiber Bragg grating.