High peak- and average-power pulse shaped fiber laser in the ns-regime applying step-index XLMA gain fibers

Dinger, R.; Grundmann, Frank-Peter; Hapke, Christian; Ruppik, Stefan

doi:10.1117/12.2033533

Cited by 7 publications

(3 citation statements)

References 6 publications

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“…However, limited by nonlinear effects such as stimulated Raman scattering, self-phase modulation and stimulated Brillouin scattering, etc [3][4][5][6], the development of an all-fiber system with high average power, high peak power and near diffraction-limited beam quality is quite a challenging work. Although the traditional stepped index fiber can suppress the * Authors to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

An all-fiber high-power picosecond amplifier with Yb-doped polarization-maintaining tapered fiber

Wang¹,

Lü²,

Zhang³

et al. 2023

Laser Phys.

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A high-power picosecond all-fiber master oscillator power amplifier (MOPA) was demonstrated based on the Yb-doped polarization-maintaining (PM) tapered double-clad fiber (T-DCF). An all-fiberized pumping unit instead of the free space pumping structure was adopted in the MOPA system to provide a compact robust solution for high-performance amplifiers. The total average output power of 180.3 W was achieved with a slope efficiency of 80.8% by taking advantages of the large fiber mode area and the suppression of nonlinear effects in the T-DCF. The peak power was calculated to be 27.7 kW at the pulse width of 260.8 ps and the repetition rate of 24.91 MHz. The polarization extinction ratio and beam quality (M 2 factor) were measured to be ∼10 dB (91%) and ∼12, respectively.

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Section: Introductionmentioning

confidence: 99%

An all-fiber high-power picosecond amplifier with Yb-doped polarization-maintaining tapered fiber

Wang¹,

Lü²,

Zhang³

et al. 2023

Laser Phys.

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“…Although it is nearly impossible to fabricate a conventional single-mode step-index fiber with such a large core and a very low numerical aperture (NA), a high quality output beam can still be expected by careful seeding of an unbent homogenous step-index fiber. A recent report has shown that such fibers are capable to deliver ns pulses with multi-MW peak power in multi-mode operation [22]. Another important issue for high power fiber amplifier fibers is the potential occurrence of photodarkening, especially for higher inversion levels [23] and high Yb concentrations [24] frequently encountered in short amplifiers.…”

Section: Introductionmentioning

confidence: 99%

Very large mode area ytterbium fiber amplifier with aluminum-doped pump cladding made by powder sinter technology

He¹,

Leich²,

Grimm³

et al. 2014

Laser Phys. Lett.

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We demonstrate amplification experiments using a very large mode area Yb-doped doubleclad fiber with 100 µm aluminum-cer codoped core and 440 µm pump cladding realized by high aluminum codoping. The material for core and pump cladding was fabricated by reactive powder sinter technology. A high numerical aperture (NA) of the pump cladding with NA = 0.21 and a low one of the core with NA = 0.084 could be realized. Using a 0.55 m short fiber sample as the main amplifier in a three-stage ns pulsed fiber master oscillator power amplifier system we achieved 3 ns, 2 mJ output pulses with 360 kW peak power limited by the available pump power. Stimulated Raman scattering effects and amplified spontaneous emission were successfully suppressed.

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“…Using fiber with 200 µm core diameter in the final amplifier stage, pulses with >82 mJ of pulse energy, 25 Hz repetition rate, and 500 ns pulse width are reported by using a cascade of four-stage Ytterbium-doped fiber amplifiers [5] . However, the maximum peak power for the nanosecond pulses in the above work is only around 3 MW [6,7] which is mainly restricted by nonlinearity, e.g., stimulated Brillouin scattering (SBS), stimulated Raman scattering (SRS) and self-focusing (SF) in fiber.…”

Section: Introductionmentioning

confidence: 99%

Review of fiber superluminescent pulse amplifications

Zhang

Shen

et al. 2016

High Pow Laser Sci Eng

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High coherence of the laser is indispensable light sources in modern long or short-distance imaging systems, because the high coherence leads to coherent artifacts such as speckle that corrupt image formation. To deliver low coherence pulses in fiber amplifiers, we utilize the superluminescent pulsed light with broad bandwidth, nonlongitudinal mode structure and chaotic mode phase as the seed source of the cascaded fiber amplifiers. The influence of fiber superluminescent pulse amplification (SPA) on the limitations of the performance is analyzed. A review of our research results for SPA in the fibers are present, including the nonlinear theories of this low coherent light sources, i.e., self-focusing (SF), stimulated Raman scattering (SRS) and self-phase modulation (SPM) effects, and the experiment results of the nanosecond pulses with peak power as high as 4.8 MW and pulse energy as much as 55 mJ. To improve the brightness of SPA light in the future work, we introduce our novel evaluation term and a more reasonable criterion, which is denoted by a new parameter of brightness factor for active large mode area fiber designs. A core-doped active large pitch fiber with a core diameter of 190 µm and a mode-field diameter of 180 µm is designed by this method. The designed fiber allows near diffracted limited beam quality operation, and it can achieve 100 mJ pulse energy and 540 W average power by analyzing the mode coupling effects induced by heat.

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High peak- and average-power pulse shaped fiber laser in the ns-regime applying step-index XLMA gain fibers

Cited by 7 publications

References 6 publications

An all-fiber high-power picosecond amplifier with Yb-doped polarization-maintaining tapered fiber

An all-fiber high-power picosecond amplifier with Yb-doped polarization-maintaining tapered fiber

Very large mode area ytterbium fiber amplifier with aluminum-doped pump cladding made by powder sinter technology

Review of fiber superluminescent pulse amplifications

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