scholarly journals Development and prospect of high-power doped fibers

2018 ◽  
Vol 6 ◽  
Author(s):  
Yibo Wang ◽  
Gui Chen ◽  
Jinyan Li
Keyword(s):  
Output Power ◽  
High Power ◽  
Fiber Lasers ◽  
Beam Quality ◽  
Research Work ◽  
Excited State Absorption ◽  
Single Mode ◽  
Energy Structure ◽  
Doped Fibers ◽  
The Stability

Ytterbium-doped fibers have become the optimum gain media of high-power fiber lasers thanks to a simple energy structure, which strongly reduces the excited state absorption, and a low quantum defect and a high optic–optic conversion efficiency, which means the low thermal load. In this paper, we take a review of the current state of the art in terms of $\text{Yb}^{3+}$ doped fibers for high-power fiber lasers, including the development of the fabrication techniques. The research work to overcome the challenges for $\text{Yb}^{3+}$ doped fibers, which affect the stability of output power and beam quality, will be demonstrated. Direction of further research is presented and the goal is to look for a fiber design, to boost single fiber output power, stabilize the laser power and support robust single-mode operation.

Four-wave mixing effect on high-power continuous-wave all-fiber lasers

2018 ◽  
Vol 32 (23) ◽  
pp. 1850275
Author(s):  
Jinkun Zheng ◽  
Wei Zhao ◽  
Baoyin Zhao ◽  
Zhe Li ◽  
Gang Li ◽  
...  
Keyword(s):  
High Power ◽  
Fiber Lasers ◽  
Continuous Wave ◽  
Beam Quality ◽  
Matching Condition ◽  
Four Wave Mixing ◽  
Theoretical Description ◽  
Phase Matching ◽  
Wave Mixing ◽  
Mixing Effect

A four-wave mixing effect on high-power continuous-wave fiber lasers has been demonstrated theoretically and experimentally. Detailed theoretical description of phase matching is presented and we found that the phase matching condition is satisfied at the frequency shift of 5.16 THz. While the intensity in fiber core region is more than about 394 MW/cm2, the four-wave mixing products of 1100 nm and 1060 nm were also observed in high-power all-fiber laser. The comparison shows that the experiment result is in good agreement with the simulation result. In addition, the beam quality deterioration for the laser is caused by the four-wave mixing effect and the mode instability. The [Formula: see text] factor measured at maximal intensity of 478 MW/cm2 is 2.80.

scholarly journals High-power long-wave infrared laser based on polarization beam coupling technique

2020 ◽  
Vol 8 ◽  
Author(s):  
Yingjie Shen ◽  
Chuanpeng Qian ◽  
Xiaoming Duan ◽  
Ruijun Lan
Keyword(s):  
Output Power ◽  
High Power ◽  
Beam Quality ◽  
Maximum Output Power ◽  
Infrared Laser ◽  
Maximum Output ◽  
Coupling Technique ◽  
Long Wave ◽  
Beam Coupling ◽  
Long Wave Infrared

We demonstrated a high-power long-wave infrared laser based on a polarization beam coupling technique. An average output power at $8.3~\unicode[STIX]{x03BC}\text{m}$ of 7.0 W was achieved at a maximum available pump power of 107.6 W, corresponding to an optical-to-optical conversion of 6.5%. The coupling efficiency of the polarization coupling system was calculated to be approximately 97.2%. With idler single resonance operation, a good beam quality factor of ${\sim}1.8$ combined with an output wavelength of $8.3~\unicode[STIX]{x03BC}\text{m}$ was obtained at the maximum output power.

scholarly journals High power mid-infrared supercontinuum generation in a single-mode ZBLAN fiber with up to 218 W average output power

2014 ◽  
Vol 22 (20) ◽  
pp. 24384 ◽  
Author(s):  
Kun Liu ◽  
Jiang Liu ◽  
Hongxing Shi ◽  
Fangzhou Tan ◽  
Pu Wang
Keyword(s):  
Output Power ◽  
High Power ◽  
Average Output Power ◽  
Single Mode ◽  
Supercontinuum Generation ◽  
Average Output ◽  
Mid Infrared

Efficient High-power Single-mode Yb Three-level Cladding-pumped All-solid Photonic Bandgap Fiber Lasers at ~978nm

2019 ◽  
Author(s):  
Turghun Matniyaz ◽  
Wensong Li ◽  
Monica Kalichevsky-Dong ◽  
Thomas W. Hawkins ◽  
Joshua Parsons ◽  
...  
Keyword(s):  
High Power ◽  
Fiber Lasers ◽  
Photonic Bandgap ◽  
Single Mode ◽  
Photonic Bandgap Fiber

Analysis of the stability of multiple-phase-shift distributed-feedback semiconductor lasers

1993 ◽  
Vol 71 (1-2) ◽  
pp. 29-38 ◽  
Author(s):  
Yves Champagne ◽  
Nathalie McCarthy
Keyword(s):  
Phase Shift ◽  
Semiconductor Lasers ◽  
Output Power ◽  
Longitudinal Mode ◽  
Single Mode ◽  
Distributed Feedback ◽  
Hole Burning ◽  
Lasing Wavelength ◽  
Multiple Phase ◽  
The Stability

The effects of the longitudinal spatial hole burning on the static lasing characteristics of a specific configuration of distributed-feedback semiconductor laser with three phase-shift regions are investigated using a numerical approach. A serious degradation of the stability of the optimum design, having the flattest axial intensity distribution at low output power, is predicted for drive levels beyond a critical value. The lasing wavelength exhibits a sudden shift (wavelength chirping), along with a significant degradation of the single-mode character of the longitudinal-mode spectrum. Thus, the potentialities of this multiple-phase-shift structure to provide a stable narrow-linewidth emission at high output power appear to be less than expected from results calculated for the near-threshold regime. Nevertheless, it is found that a multiple-phase-shift configuration that departs slightly from the optimum case suffices to recover most of the promises expected from this distributed-feedback laser design.

scholarly journals High-repetition-rate and high-power picosecond regenerative amplifier based on a single bulk Nd:GdVO4 crystal

2019 ◽  
Vol 7 ◽  
Author(s):  
Jie Guo ◽  
Wei Wang ◽  
Hua Lin ◽  
Xiaoyan Liang
Keyword(s):  
Output Power ◽  
High Power ◽  
Repetition Rate ◽  
Beam Quality ◽  
Maximum Output Power ◽  
High Repetition Rate ◽  
Maximum Output ◽  
Bifurcation Instability ◽  
Regenerative Amplifier ◽  
High Repetition

We report on a high-repetition-rate, high-power continuously pumped Nd:GdVO4 regenerative amplifier. Numerical simulations successfully pinpoint the optimum working point free of bifurcation instability with simultaneous efficient energy extraction. At a repetition rate of 100 kHz, a maximum output power of 23 W was obtained with a pulse duration of 27 ps, corresponding to a pulse energy of $230~\unicode[STIX]{x03BC}\text{J}$ . The system displayed an outstanding stability with a root mean square power noise as low as 0.3%. The geometry of the optical resonator and the pumping scheme enhanced output power in the $\text{TEM}_{00}$ mode with a single bulk crystal. Accordingly, nearly diffraction-limited beam quality was produced with $M^{2}\approx 1.2$ at full pump power.

Comparison of high power large mode area and single mode 1908nm Tm-doped fiber lasers

2016 ◽  
Author(s):  
Benjamin R. Johnson ◽  
Daniel Creeden ◽  
Julia Limongelli ◽  
Herman Pretorius ◽  
Jon Blanchard ◽  
...  
Keyword(s):  
High Power ◽  
Fiber Lasers ◽  
Single Mode ◽  
Large Mode Area ◽  
Mode Area

scholarly journals Single-mode spectral beam combining of high power Tm-doped fiber lasers with WDM cascades

2016 ◽  
Author(s):  
Sinem Yilmaz ◽  
Christoph Ottenhues ◽  
Thomas Theeg ◽  
Samir Lamrini ◽  
Karsten Scholle ◽  
...  
Keyword(s):  
High Power ◽  
Fiber Lasers ◽  
Single Mode ◽  
Beam Combining ◽  
Spectral Beam Combining

All-fiber 7 \tiems 1 signal combiner with high beam quality for high-power fiber lasers

2015 ◽  
Vol 13 (6) ◽  
pp. 061406-61409 ◽  
Author(s):  
Hang Zhou Hang Zhou ◽  
Zilun Chen Zilun Chen ◽  
Xuanfeng Zhou Xuanfeng Zhou ◽  
Jing Hou Jing Hou ◽  
Jinbao Chen Jinbao Chen
Keyword(s):  
High Power ◽  
Fiber Lasers ◽  
Beam Quality ◽  
High Beam ◽  
High Beam Quality
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