High-power monolithic narrow-linewidth 1.6 mJ/8 ns fiber laser system based on all-glass spun tapered double-clad fiber amplifier

Hossein Fathi; Uttam Samanta; Evgenii Motorin; Ebrahim Aghayari; Andrey Grishchenko; Matias Koivurova; Regina Gumenyuk; Valery Filippov

arXiv · 2508.06989

High-power monolithic narrow-linewidth 1.6 mJ/8 ns fiber laser system based on all-glass spun tapered double-clad fiber amplifier

Hossein Fathi·Uttam Samanta·Evgenii Motorin·Ebrahim Aghayari·Andrey Grishchenko·Matias Koivurova·Regina Gumenyuk·Valery Filippov

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Abstract

High-energy, narrow-linewidth nanosecond pulses are highly demanding for many applications that require high temporal and spatial coherence. However, the amplification of narrow-linewidth pulses is primarily limited by stimulated Brillouin scattering, which causes pulse instabilities, back-reflected pulses, and catastrophic damage effects on optical components. In this work, we present a 1.6 mJ narrow-linewidth nanosecond pulsed fiber laser system based on all-glass spun tapered double-clad fibers without employing any mitigating technique for the stimulated Brillouin scattering effect. The system delivers pulses with an 8 ns duration at a 100 kHz repetition rate, over 97.5% degree of polarization, a beam quality factor of M2 = 1.3, a spectral linewidth of 53.8 MHz, a 160 W average power, and 188 kW peak power with a slope efficiency of 97.6%. The degree of spatial coherence of the amplified signal was measured to be 0.94. Our results are highly valued in applications requiring high-energy, high-coherence pulses with spectral, spatial, and polarization characteristics in a compact system.

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Hossein Fathi, Uttam Samanta, Evgenii Motorin, Ebrahim Aghayari, Andrey Grishchenko, Matias Koivurova, Regina Gumenyuk, Valery Filippov. 2025-08-09. High-power monolithic narrow-linewidth 1.6 mJ/8 ns fiber laser system based on all-glass spun tapered double-clad fiber amplifier. https://arxiv.org/abs/2508.06989

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