4.6â
kW linearly polarized and narrow-linewidth monolithic fiber amplifier based on a fiber oscillator laser seed.
Opt Lett
; 48(24): 6533-6536, 2023 Dec 15.
Article
en En
| MEDLINE
| ID: mdl-38099792
ABSTRACT
In this work, a record output power of 4.6â
kW linearly polarized and narrow-linewidth fiber amplifier based on an optimized fiber oscillator laser (FOL) seed was realized by employing a homemade polarization-maintaining Yb-doped fiber (PMYDF), corresponding to a slope efficiency of 79.5% and a 3â
dB linewidth of 0.3452â
nm. Through an effective strategy relying on decreasing the transmission fiber length from 200 m to 120 m and adding a chirped and tilted fiber Bragg grating (CTFBG), the stimulated Raman scattering (SRS) effects were well-suppressed. By applying the forward combiner with the interconnection between the pump arms into the MOPA system, the MI threshold is increased by more than 560 W and the slope efficiency of the upgraded MOPA system is boosted by 5%. During the experimental process of power amplification, the polarization extinction ratio (PER) remains higher than 15â
dB, and a near-diffraction-limited output beam at the laser power of 2980â
W was measured with the M2x = 1.314 and M2y = 1.311.
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MEDLINE
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En
Revista:
Opt Lett
Año:
2023
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Article