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9 March 2016 Kilowatt-level narrow-linewidth monolithic fiber amplifier based on laser gain competition
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Laser gain competition was used in conjunction with external phase modulation techniques in order to investigate power scaling of narrow-linewidth monolithic Ytterbium-doped fiber amplifiers. In this study, both pseudo-random bit sequence (PRBS) and filtered white noise source (WNS) modulation techniques were separately utilized to drive the external phase modulator for linewidth broadening. The final-stage amplifier was then seeded with the phase modulated narrow-linewidth 1064 nm signal along with a spectrally broader 1038 nm source. Consequently, integration of laser gain competition in conjunction with PRBS phase modulation yields a factor of ∼15 dB in stimulated Brillouin scattering (SBS) threshold enhancement at a clock rate of 2.5 GHz; leading to 1 kilowatt of output power with 85% optical efficiency at 1064 nm. Notably, the combination of PRBS phase modulation with laser gain competition provided superior enhancement in SBS threshold power when compared to the WNS modulated case. The beam quality at maximum power was near the diffraction limit (M2 <1.2) with no sign of modal instability. Overall, the power scaling results represent a significant reduction in spectral linewidth compared to that of commercially available narrowlinewidth Ytterbium-doped fiber amplifiers.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Nader A. Naderi, Angel Flores, Brian M. Anderson, and Iyad Dajani "Kilowatt-level narrow-linewidth monolithic fiber amplifier based on laser gain competition", Proc. SPIE 9728, Fiber Lasers XIII: Technology, Systems, and Applications, 972804 (9 March 2016);

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