High-power pump combiners for Tm-doped fibre lasers

AbstractIn this paper our results of investigation on a pump power combiner in a configuration of 7×1 are presented. The performed combiner, with pump power of 80–85% transmission level, was successfully applied in a thulium doped fibre laser. The performed all-fibre laser setup reached a total CW output power of 6.42 W, achieving the efficiency on a 32.1% level.

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Towards high-power mid-IR light source tunable from 3.8 to 4.5 µm by HBr-filled hollow-core silica fibres

Light Science & Applications ◽

10.1038/s41377-021-00703-6 ◽

2022 ◽

Vol 11 (1) ◽

Author(s):

Zhiyue Zhou ◽

Zefeng Wang ◽

Wei Huang ◽

Yulong Cui ◽

Hao Li ◽

...

Keyword(s):

High Power ◽

Continuous Wave ◽

Transmission Loss ◽

Coupling Efficiency ◽

Fibre Length ◽

Fibre Laser ◽

Hollow Core ◽

Fibre Lasers ◽

Fibre Amplifier ◽

Ir Emission

AbstractFibre lasers operating at the mid-IR have attracted enormous interest due to the plethora of applications in defence, security, medicine, and so on. However, no continuous-wave (CW) fibre lasers beyond 4 μm based on rare-earth-doped fibres have been demonstrated thus far. Here, we report efficient mid-IR laser emission from HBr-filled silica hollow-core fibres (HCFs) for the first time. By pumping with a self-developed thulium-doped fibre amplifier seeded by several diode lasers over the range of 1940–1983 nm, narrow linewidth mid-IR emission from 3810 to 4496 nm has been achieved with a maximum laser power of about 500 mW and a slope efficiency of approximately 18%. To the best of our knowledge, the wavelength of 4496 nm with strong absorption in silica-based fibres is the longest emission wavelength from a CW fibre laser, and the span of 686 nm is also the largest tuning range achieved to date for any CW fibre laser. By further reducing the HCF transmission loss, increasing the pump power, improving the coupling efficiency, and optimizing the fibre length together with the pressure, the laser efficiency and output power are expected to increase significantly. This work opens new opportunities for broadly tunable high-power mid-IR fibre lasers, especially beyond 4 μm.

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Design of Yb Fiber High Power Amplifier through 915nm Pumping

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.282-283.42 ◽

2011 ◽

Vol 282-283 ◽

pp. 42-46

Author(s):

Zhi Qiang Zhang ◽

Jian Hua Ren ◽

Shu Qun Shen ◽

Tong Gang Zhao

Keyword(s):

Pump Power ◽

Output Power ◽

Power Amplifier ◽

Rate Equation ◽

High Power ◽

Fiber Length ◽

Gain Medium ◽

Pump Source ◽

High Power Amplifier ◽

Single Emitter

Analyze the fiber amplified theory and obtain the transmission formula of pump and signal for the use of rate equation. In the experiment, take the Yb-doped double cladding fiber based on phosphor silicate as gain medium, high power single emitter in 915nm as pump source. According to gain fiber length obtained by the theory analyses, the output power achieves 20W above. Apply the cladding power stripper at the output end for stripping the remained pump power.

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High-Power Fibre Lasers – Application Potentials for Welding of Steel and Aluminium Sheet Material

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.6-8.171 ◽

2005 ◽

Vol 6-8 ◽

pp. 171-178 ◽

Cited By ~ 3

Author(s):

Claus Thomy ◽

Thomas Seefeld ◽

Frank Vollertsen

Keyword(s):

High Power ◽

Welding Speed ◽

Beam Quality ◽

Sheet Material ◽

Laser Source ◽

Fibre Laser ◽

Energetic Efficiency ◽

Fibre Lasers ◽

Aluminium Sheet ◽

Compact Size

Latest developments in laser physics have enabled the production of high-power fibre lasers with beam powers up to 10 kW at excellent beam quality. Adding to these properties their high energetic efficiency, their considerable estimated lifetime and their compact size, they might well be considered to be a viable alternative to both conventional lamp- or diode-pumped Nd:YAGas well as to CO2-Lasers. However, due to the novelty of the system, very few experiences on their usability for materials processing and in special for welding of steel and aluminium sheet material are existing. To help this situation, a 7 kW high-power fibre laser system was tested at the Bremer Institut fuer angewandte Strahltechnik, and its potentials for welding steel and aluminium sheets have been assessed. By these results, of which a selection is presented here, it could indeed be demonstrated that it is possible to remarkably enhance process limitations considering welding speed and sheet thickness previously regarded to be inevitable when welding with solid-state lasers. Consequently, in July 2004 the first high-power fibre laser with a beam power exceeding 10 kW at a BPP of less than 12.5 mm*mmrad was tested in cooperation with SLV M-V Rostock. This laser source is currently used for developing mainly welding, but also cutting and cladding applications for a variety of industries. Within these studies, it was e. g. demonstrated that it is possible to achieve a penetration of 10 mm in EN-AW 6082 at a welding speed of 3 m/min.

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High Power Ytterbium-Doped Fiber Super-Fluorescent Sources

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.475-476.1649 ◽

2013 ◽

Vol 475-476 ◽

pp. 1649-1653

Author(s):

Lan Ling Lan ◽

Yan Liu ◽

Xue Rong Chang ◽

Yao Huang ◽

Ji Sheng Zhang ◽

...

Keyword(s):

Pump Power ◽

Output Power ◽

High Power ◽

Fiber Length ◽

Spectrum Width ◽

The Mean ◽

Output Characteristics

The output characteristics of high power ytterbium-doped fiber super-fluorescent sources were analyzed. 75.7W output power can be achieved when the 915nm pump power is 100W, and the fiber length is 10m.when the pump power changes from 20 to 100W, the backward super-fluorescent power is always larger than the forward. The mean wavelength of the forward and backward super-fluorescent is very stable. The spectrum width all decrease. The spectrum width of forward ASE changes from 24.8nm to 21.4nm when the pump power changes from 20 to 100W. The spectrum width of backward ASE changes from 25.5nm to 22.3nm.

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