Abstract

We report what is to our knowledge the first demonstration of pulse amplification in a cw-pumped fiber in which the doped gain medium has a ring shape surrounding a single-mode core. For a given pump power, ring doping reduces the gain and hence the power lost to amplified spontaneous emission. Thereby, a significantly larger amount of energy can be stored in the amplifier. Using an Yb3+-doped fiber pumped by 540  mW of power at 1000  nm, we measured 69 µJ of extracted pulse energy at 1047  nm, the highest value reported to date from a single-mode Yb3+-doped fiber. We predict that a fiber cladding pumped by a diode bar can produce pulse energies in excess of 1  mJ.

© 1997 Optical Society of America

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