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21 February 2020 Wavelength flexible, kW-level narrow linewidth fibre laser based on 7GHz PRBS phase modulation
W. Y. W. Lim, K. W. Seah, Y. E. Ye, B. S. Tan, C. P. Seah
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Proceedings Volume 11260, Fiber Lasers XVII: Technology and Systems; 1126006 (2020) https://doi.org/10.1117/12.2547482
Event: SPIE LASE, 2020, San Francisco, California, United States
Abstract
We report on the results of a narrow linewidth fibre laser with <1kW laser output. Pseudo-random bit sequence (PRBS) phase modulation at 6.9GHz was employed to suppress Stimulated Brillouin Scattering (SBS). The laser demonstrated wavelength tunable operation from 1036nm to 1071nm, with spectral purity exceeding 40dB over most of the range. A delivery fibre length of 3m was enabled by exploiting the short gain lengths in a customized 250μm cladding fibre design. Near diffraction limited beam quality of M2=1.19 was measured with no indication of transverse modal instability (TMI).
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W. Y. W. Lim, K. W. Seah, Y. E. Ye, B. S. Tan, and C. P. Seah "Wavelength flexible, kW-level narrow linewidth fibre laser based on 7GHz PRBS phase modulation", Proc. SPIE 11260, Fiber Lasers XVII: Technology and Systems, 1126006 (21 February 2020); https://doi.org/10.1117/12.2547482
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KEYWORDS
Fiber lasers
Phase modulation
Fiber amplifiers
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