Patent ID: 8837038

Claim:
A fiber geometrical management system for TEM00 pulse energy scaling comprising: a tapered fiber comprising: an elliptical core centrally positioned within a single cladding or double cladding shell, wherein the elliptical core comprises a fiber material and a doped gain medium; an input face wherein the doped elliptical core comprises a first major axis and a first minor axis, wherein the ratio of the first major axis to the first minor axis of the doped elliptical core at the input face ranges from about 1 to about 100; and an output face wherein the doped elliptical core comprises a second major axis and a second minor axis, wherein the ratio of the second major axis to the second minor axis of the doped elliptical core at the output face ranges from about 1 to about 100; wherein the first minor axis of the doped elliptical core at the input face is adiabatically or linearly tapered to the second minor axis of the doped elliptical core at the output face; wherein the first major axis of the doped elliptical core at the input face is adiabatically or linearly tapered to the second major axis of the doped elliptical core at the output face; wherein the doped gain medium of the elliptical core extends from the input face to the output face; and wherein the tapered fiber is polarization maintaining.