激光线宽
材料科学
光学
放大器
光纤激光器
伪随机二进制序列
布里渊散射
光放大器
激光功率缩放
激光器
光电子学
物理
数学
CMOS芯片
二进制数
算术
作者
Nader Naderi,Angel Flores,Brian Anderson,Iyad Dajani
摘要
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.
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