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Advanced Imaging
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Research Articles
All-fiberized and narrow-linewidth 5 kW power-level fiber amplifier based on a bidirectional pumping configuration
Pengfei Ma
Hu Xiao
Wei Liu
Hanwei Zhang
[ ... ]
Pu Zhou
*
Author Affiliations
Abstract
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha410073, China
In this paper, an all-fiberized and narrow-linewidth 5 kW power-level fiber amplifier is presented. The laser is achieved based on the master oscillator power amplification configuration, in which the phase-modulated single-frequency laser is applied as the seed laser and a bidirectional pumping configuration is applied in the power amplifier. The stimulated Brillouin scattering, stimulated Raman scattering, and transverse mode instability effects are all effectively suppressed in the experiment. Consequently, the output power is scaled up to 4.92 kW with a slope efficiency of as high as approximately 80%. The 3-dB spectral width is about 0.59 nm, and the beam quality is measured to be
M
2
∼1.22 at maximum output power. Furthermore, we have also conducted a detailed spectral analysis on the spectral width of the signal laser, which reveals that the spectral wing broadening phenomenon could lead to the obvious decrease of the spectral purity at certain output power. Overall, this work could provide a reference for obtaining and optimizing high-power narrow-linewidth fiber lasers.
advanced laser technology and applications
fiber laser and applications
high-power laser
laser amplifiers
PDF全文
Full Text
High Power Laser Science and Engineering
2021, 9(3): 03000e45
Research Articles
High power all-fiberized and narrow-bandwidth MOPA system by tandem pumping strategy for thermally induced mode instability suppression
Download:770次
Pengfei Ma
1,2
Hu Xiao
1,2
Daren Meng
1
Wei Liu
1
[ ... ]
Zejin Liu
1,2
Author Affiliations
Abstract
1
College of Advanced Interdisciplinary Studies , National University of Defense Technology , Changsha 410073 , China
2
Hunan Provincial Collaborative Innovation Center of High Power Fiber Laser , National University of Defense Technology , Changsha 410073 , China
An all-fiberized and narrow-bandwidth master oscillator power amplification (MOPA) system with record output power of 4 kW level and slope efficiency of 78% is demonstrated. Tandem pumping strategy is tentatively introduced into the narrow-bandwidth MOPA system for thermally induced mode instability (TMI) suppression. The stimulated Brillouin scattering (SBS) effect is balanced by simply using one-stage phase modulation technique. With different phase modulation signals, SBS limited output powers of 336 W, 1.2 kW and 3.94 kW are respectively achieved with spectral bandwidths accounting for 90% power of
${\sim}$
0.025, 0.17 and
${\sim}$
0.89 nm. Compared with our previous 976 nm pumping system, TMI threshold is overall boosted to be
${>}$
5 times in which tandem pumping increases the TMI threshold of
${>}$
3 times. The beam quality (
$M^{2}$
factor) of the output laser is well within 1.5 below the TMI threshold while it is ultimately saturated to be 1.86 with the influence of TMI at maximal output power. Except for SBS and TMI, stimulated Raman scattering (SRS) effect will be another challenge for further power scaling. In such a high power MOPA system, multi-detrimental effects (SBS, SRS and TMI) will coexist and may be mutual-coupled, which could provide a well platform for further comprehensively investigating and optimizing the high power, narrow-bandwidth fiber amplifiers.
advanced laser technology and applications
design
fiber laser and applications
high power laser
laser amplifiers
laser systems
modeling
narrow linewidth
optimization
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Full Text
High Power Laser Science and Engineering
2018, 6(4): 04000e57
Research Articles
Suppression of amplitude modulation induced by polarization mode dispersion using a multi-degree-of-freedom fiber filter
Download:642次
Rao Li
1,2,3
Youen Jiang
1,2
Zhi Qiao
1,2,3
Canhong Huang
1,2,3
[ ... ]
Zunqi Lin
1,2
Author Affiliations
Abstract
1
National Laboratory on High Power Laser and Physics , Shanghai 201800 , China
2
Key Laboratory of High Power Laser and Physics , Shanghai Institute of Optics and Fine Mechanics , Chinese Academy of Sciences , Shanghai 201800 , China
3
University of Chinese Academy of Sciences , Beijing 100049 , China
Polarization mode dispersion (PMD) in fibers for high-power lasers can induce significant frequency modulation to amplitude modulation (FM-to-AM) conversion. However, existing techniques are not sufficiently flexible to achieve efficient compensation for such FM-to-AM conversion. By analyzing the nonuniform transmission spectrum caused by PMD, we found that the large-scale envelope of the transmission spectrum has more serious impacts on the amount of AM. In order to suppress the PMD-induced FM-to-AM conversion, we propose a novel tunable spectral filter with multiple degrees of freedom based on a half-wave plate, a nematic liquid crystal, and an axis-rotated polarization-maintaining fiber. Peak wavelength, free spectral range (FSR), and modulation depth of the filter are decoupled and can be controlled independently, which is verified through both simulations and experiments. The filter is utilized to compensate for the PMD-induced FM-to-AM conversion in the front end of a high-power laser facility. The results indicate that, for a pulse with phase-modulation frequency of 22.82 GHz, the FM-to-AM conversion could be reduced from 18% to 3.2% within a short time and maintained below 6.5% for 3 h. The proposed filter is also promising for other applications that require flexible spectral control such as high-speed channel selection in optical communication networks.
advanced laser technology and applications
design
fiber laser and applications
high-power laser
laser facility
laser facility and engineering
laser systems
modeling
optimization
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High Power Laser Science and Engineering
2018, 6(4): 04000e53
Diode Pumped Solid State Lasers
Scaling diode-pumped, high energy picosecond lasers to kilowatt average powers
Download:832次
Brendan A. Reagan
1,2,†
Cory Baumgarten
3
Elzbieta Jankowska
1
Han Chi
1
[ ... ]
Jorge J. Rocca
1,2,3
Author Affiliations
Abstract
1
Department of Electrical and Computer Engineering, Colorado State University, Fort Collins, CO 80523, USA
2
XUV Lasers Inc., PO Box 273251, Fort Collins, CO 80527, USA
3
Department of Physics, Colorado State University, Fort Collins, CO 80523, USA
Recent results in the development of diode-driven high energy, high repetition rate, picosecond lasers, including the demonstration of a cryogenic Yb:YAG active mirror amplifier that produces 1.5 J pulses at 500 Hz repetition rate (0.75 kW average power) are reviewed. These pulses are compressed resulting in the generation of
${\sim}5~\text{ps}$
duration, 1 J pulses with 0.5 kW average power. A full characterization of this high power cryogenic amplifier, including at-wavelength interferometry of the active region under
${>}1~\text{kW}$
average power pump conditions, is presented. An initial demonstration of operation at 1 kW average power (1 J, 1 kHz) is reported.
advanced laser technology and applications
diode-pumped solid-state laser and applications
high power laser
high power laser related laser components
laser amplifiers
PDF全文
Full Text
High Power Laser Science and Engineering
2018, 6(1): 01000e11
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