Journal
OPTICS EXPRESS
Volume 22, Issue 15, Pages 17735-17744Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.017735
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- High Energy Laser Joint Technology Office (HEL-JTO)
- Drs. Arje Nachman and Howard Schlossberg of the Air Force Office of Scientific Research (AFOSR)
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We report on pseudo random binary sequence (PRBS) phase modulation for narrow-linewidth, kilowatt-class, monolithic (all-fiber) amplifiers. Stimulated Brillouin scattering (SBS) threshold enhancement factors for different patterns of PRBS modulated fiber amplifiers were experimentally analyzed and agreed well with the theoretical predictions. We also examined seeding of the SBS process by phase modulated signals when the effective linewidth is on the same order as the Brillouin shift frequency. Here similar to 30% variations in SBS power thresholds were observed from small tunings of the modulation frequency. In addition, a 3 GHz PRBS modulated, 1.17 kW fiber amplifier was demonstrated. Near diffraction-limited beam quality was achieved (M-2 = 1.2) with an optical pump efficiency of 83%. Overall, the improved SBS suppression and narrow linewidth achieved through PRBS modulation can have a significant impact on the beam combining of kilowatt class fiber lasers. (C) 2014 Optical Society of America
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