US 12,300,960 B2
Doped fiber amplifier having pass-through pump laser
Ian Peter McClean, Brixham (GB); Nadhum Kadhum Zayer, Devon (GB); and Martin Richard Williams, Big Flats, NY (US)
Assigned to II-VI DELAWARE, INC., Wilmington, DE (US)
Filed by II-VI Delaware, Inc, Wilmington, DE (US)
Filed on Jun. 29, 2023, as Appl. No. 18/344,389.
Application 18/344,389 is a continuation of application No. 17/157,171, filed on Jan. 25, 2021, granted, now 11,728,613.
Prior Publication US 2023/0352898 A1, Nov. 2, 2023
Int. Cl. H01S 3/0941 (2006.01); H01S 3/067 (2006.01); H01S 3/094 (2006.01); H01S 3/16 (2006.01); H01S 5/0239 (2021.01); H01S 5/04 (2006.01); H01S 5/50 (2006.01); H01S 5/40 (2006.01)
CPC H01S 3/0941 (2013.01) [H01S 3/06716 (2013.01); H01S 3/0675 (2013.01); H01S 3/06754 (2013.01); H01S 3/094003 (2013.01); H01S 3/094053 (2013.01); H01S 3/1608 (2013.01); H01S 5/50 (2013.01); H01S 5/0239 (2021.01); H01S 5/041 (2013.01); H01S 5/40 (2013.01); H01S 5/5027 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A fiber amplifier for amplifying signal light having a signal wavelength, the fiber amplifier comprising:
a laser diode configured to pass the signal light through the laser diode, and
generate pump light having a pump wavelength different from the signal wavelength, wherein the laser diode includes an active section, an input facet, and an output facet; and
a fiber doped with an active dopant, the pump light being configured to interact with the active dopant and thereby amplify the signal light,
wherein the input facet comprises a first reflectivity at least at the pump wavelength; wherein the output facet comprises a second reflectivity at least at the pump wavelength, and wherein the first reflectivity is different from the second reflectivity.