22 February 2008 All-fiber 194 W single-frequency single-mode Yb-doped master-oscillator power-amplifier
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A four-stage all-fiber single-frequency single-mode continuous-wave (cw) master-oscillator power-amplifier (MOPA) at 1083 nm is presented. Small mode area (SMA) and large mode area (LMA) amplifier stages are mode matched with a fiber mode converter (MC) and the signal and pumps are combined with tapered fiber bundles (TFBs). The final power stage uses a LMA Yb doped SBS-suppressing fiber. A single-frequency output power of 194 W is demonstrated with optical net and slope efficiencies of 73% and 80%, respectively. Numerical simulations for the signal output power and the SBS-induced Stokes backscattered power in the 4th stage amplifier agree with the experimental results. Pulse amplifier measurements showed a 400 W peak power output that was limited by the forward output ASE. The SBS reflectivity at 400 W output was only 2.75 x 10-4.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. D. Mermelstein, M. D. Mermelstein, K. Brar, K. Brar, M. J. Andrejco, M. J. Andrejco, A. D. Yablon, A. D. Yablon, M. Fishteyn, M. Fishteyn, C. Headley, C. Headley, D. J. DiGiovanni, D. J. DiGiovanni, } "All-fiber 194 W single-frequency single-mode Yb-doped master-oscillator power-amplifier", Proc. SPIE 6873, Fiber Lasers V: Technology, Systems, and Applications, 68730L (22 February 2008); doi: 10.1117/12.767490; https://doi.org/10.1117/12.767490


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