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High-Power \hbox {Yb}^{{bm 3}{bm +}} -Doped Phosphate Fiber Amplifier

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6 Author(s)
Yin-wen Lee ; Edward L. Ginzton Lab., Stanford Univ., Stanford, CA ; Digonnet, M.J.F. ; Sinha, S. ; Urbanek, K.E.
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We report on the development of novel high-power light sources utilizing a Yb3+-doped phosphate fiber as the gain element. This host presents several key benefits over silica, particularly much higher Yb2 O3 concentrations (up to 26 wt%), a 50% weaker stimulated Brillouin scattering (SBS) gain cross section, and the absence of observable photodarkening even at high population inversion. These properties result in a greatly increased SBS threshold compared to silica fibers, and therefore, potentially much higher output powers out of either a multimode large mode area or a single-mode fiber, which means in the latter case a higher beam quality. To quantify these predictions, we show through numerical simulations that double-clad phosphate fibers should produce as much as ~ 700 W of single-frequency output power in a step index, single-mode core. As a step in this direction, we report a short phosphate fiber amplifier doped with 12 wt% Yb2 O3 that emits 16 W of single-frequency single-mode output. We also describe a single-mode phosphate fiber laser with a maximum output power of 57 W. The laser slope efficiency is currently limited by the fairly high fiber loss ( ~ 3 dB/m). Measurements indicate that 77% of this loss originates from impurity absorption, and the rest from scattering.

Published in:

Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:15 ,  Issue: 1 )

Date of Publication:

Jan. 2009

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