414  W near-diffraction-limited all-fiberized single-frequency polarization-maintained fiber amplifier

Huang, Long; Wu, Hanshuo; Li, Ruixian; Li, Lei; Ma, Pengfei; Wang, Xiaolin; Leng, Jinyong; Zhang, Pu

doi:10.1364/ol.42.000001

Cited by 76 publications

(28 citation statements)

References 30 publications

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“…Therefore, comparing to normal considering 1 st Stokes induced by continuous wave, the self-pulsing can be a more notable threat to the fiber laser system, as it appears before normal considering SBS threshold. Since self-pulsing is induced by SBS, common SBS suppression methods [15]- [17], [20], [41]- [42] can also be suitable for suppressing these self-pulses. In 2019, by using three common SBS suppression methods (counter-pumping, larger mode area passive fiber and wider spectral linewidth), the self-pulsing threshold of our experimental fiber laser system was increased by a factor of 1.5 [38].…”

Section: Introductionmentioning

confidence: 99%

2.5 kW Narrow Linewidth Linearly Polarized All-Fiber MOPA With Cascaded Phase-Modulation to Suppress SBS Induced Self-Pulsing

Feng

Chang

et al. 2020

IEEE Photonics J.

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As a major limitation for power scaling of high power narrow linewidth fiber master oscillator power amplifiers (MOPAs), Stimulated Brillouin Scattering (SBS) induced selfpulsing in polarization maintaining (PM) fiber amplifiers is well characterized and analyzed in this paper by comparing different white noise signal (WNS) phase-modulated modes in experiments. It is found that the self-pulsing effect is not observed in the PM-amplifier with single-frequency laser seed injection, and cascaded WNS modulation provides superior self-pulsing suppression than single WNS modulation with similar output linewidth. Moreover, the experimental results indicate that the self-pulsing threshold can hardly be predicted only by the output linewidth or the defined SBS threshold in a WNS phase modulated fiber amplifier system. As self-pulsing is originated from the spectral spikes in WNS modulated system, we theoretically analyzed characteristics of these spikes in different phase-modulation modes. It indicates the spectral peak intensity can be reduced by cascaded modulation, for which self-pulsing can be suppressed. The theoretical predictions agree well with the experimental results. At the same time, in order to suppress the mode instability effect, a plum blossom shaped bending mode selection device is used in this high-power narrow linewidth fiber amplifier system. Finally, a 32 GHz cascaded WNSs modulated, over than 2.5 kW linearly polarized all-fiber amplifier with a slope efficiency of 86.7% is demonstrated. The polarization extinction ratio (PER) is measured larger than 14 dB and the beam quality factor M 2 maintains lower than 1.3 in the power scaling process.

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Section: Introductionmentioning

confidence: 99%

2.5 kW Narrow Linewidth Linearly Polarized All-Fiber MOPA With Cascaded Phase-Modulation to Suppress SBS Induced Self-Pulsing

Feng

Chang

et al. 2020

IEEE Photonics J.

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“…They used a free space counter-propagative pump configuration to amplify the 1064 nm signal, but it is known that with this technique, SBS threshold is almost two times bigger than with co-propagative pump scheme [12]. In 2017, Huang et al, published for the first time 414 W of SF radiation, in an all-fiber design [13]. They used a Large Mode Area (LMA) fiber with a core diameter of 25 µm.…”

Section: Introductionmentioning

confidence: 99%

Ultra-low intensity noise, all fiber 365 W linearly polarized single frequency laser at 1064 nm

Dixneuf¹,

Guiraud²,

Bardin³

et al. 2020

Opt. Express

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We demonstrate a robust linearly polarized 365 W, very low amplitude noise, single frequency master oscillator power amplifier at 1064 nm. Power scaling was done through a custom large mode area fiber with a mode field diameter of 30 µm. No evidence of stimulated Brillouin scattering or modal instabilities are observed. The relative intensity noise is reduced down to −160 dBc/Hz between 2 kHz and 10 kHz via a wide band servo loop (1 MHz bandwidth). We achieve 350 W of isolated power, with a power stability < 0.7% RMS over 1100 hours of continuous operation and a near diffraction limited beam (M 2 < 1.1).

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“…Wielandy [10] investigated the impact of higher order modes on the M 2 -measurement and concluded that an M 2 <1.1 allows for a higher order mode content as high as 30 %. In 2013, Huang et al [11] demonstrated 414 W output power with an M 2 of 1.34. The single-frequency output power record is held by Robin et al [12] with an output power of 811 W, an M 2 of 1.2, and 10 % of the output power propagating backwards because of SBS.…”

Section: Introductionmentioning

confidence: 99%

High power, single-frequency, monolithic fiber amplifier for the next generation of gravitational wave detectors

et al. 2019

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Low noise, high power single-frequency lasers and amplifiers are key components of interferometric gravitational wave detectors. One way to increase the detector sensitivity is to increase the power injected into the interferometers. We developed a fiber amplifier engineering prototype with a pump power limited output power of 200 W at 1064 nm. No signs of stimulated Brillouin scattering are observed at 200 W. At the maximum output power the polarization extinction ratio is above 19 dB and the fractional power in the fundamental transverse mode (TEM 00) was measured to be 94.8 %. In addition, measurements of the frequency noise, relative power noise, and relative pointing noise were performed and demonstrate excellent low noise properties over the entire output power slope. In the context of single-frequency fiber amplifiers, the measured relative pointing noise below 100 Hz and the higher order mode content is, to the best of our knowledge, at 200 W the lowest ever measured. A long-term test of more than 695 h demonstrated stable operation without beam quality degradation. It is also the longest single-frequency fiber amplifier operation at 200 W ever reported.

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414 W near-diffraction-limited all-fiberized single-frequency polarization-maintained fiber amplifier

Cited by 76 publications

References 30 publications

2.5 kW Narrow Linewidth Linearly Polarized All-Fiber MOPA With Cascaded Phase-Modulation to Suppress SBS Induced Self-Pulsing

2.5 kW Narrow Linewidth Linearly Polarized All-Fiber MOPA With Cascaded Phase-Modulation to Suppress SBS Induced Self-Pulsing

Ultra-low intensity noise, all fiber 365 W linearly polarized single frequency laser at 1064 nm

High power, single-frequency, monolithic fiber amplifier for the next generation of gravitational wave detectors

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