Patent ID: 9722390
Date: 2017-08-01
CPC Classifications: G02B,H01S

Claim:
1. A 1.01 to 1.12 micron wavelength ultrashort pulse fiber amplifier with pulse width from 200 ps to 200 fs, comprising: an Ytterbium doped multicomponent glass gain fiber for laser amplification from 1.01 to 1.12 micron wavelength, comprising: a core; and a cladding; wherein said core comprises: at least 2 weight percent glass network modifier selected from BaO, CaO, MgO, ZnO, PbO, K ytterbium oxide at a level from about 3 to about 50 weight percent; wherein: a mode of the core is guided with step index difference between the core and the cladding; a numerical aperture of the gain fiber is between 0.01 and 0.04; core diameter is from 25 microns to 60 micron; a length of the gain fiber is shorter than 60 cm; wherein said fiber amplifier comprises no pulse stretching devices and no pulse compressing devices.