The road to kilowatt fiber lasers

Carter, Adrian; Samson, Bryce; Tankala, K.; Machewirth, D.; Manyam, Upendra H.; Abramczyk, Jaroslaw; Farroni, J.; Guertin, Douglas; Jacobson, Nils

doi:10.1117/12.533134

Cited by 6 publications

(3 citation statements)

References 32 publications

(35 reference statements)

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“…The fibre laser has a longer service life because its pump sources are laser diodes, which have a lifetime claimed to be around 100 000 hours [12][13][14]. Fibre lasers have power outputs comparable with Nd:YAG systems, and their beam quality is superior [14,33].…”

Section: Experimental Apparatusmentioning

confidence: 99%

Statistical analysis of ytterbium-doped fibre laser cutting of dry pine wood

Hernandez-Castaneda

Sezer

Li³

2009

Proceedings of the Institution of Mechanical Engineers, Part B:

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This paper reports a statistical analysis of the laser wood cutting process. The laser cutting of wood is a multi-factor process and correct combination of the parameters involved is needed to achieve high quality and optimum process efficiency. In this paper a design of experiments and statistical modelling approach is used to investigate the significant process parameters by consideration of parameter interactions. A high brightness, 1 kW IPG single mode ytterbium-doped fibre laser was used to cut dry pine wood samples. The investigated parameters include laser power, focal plane position, traverse speed, gas pressure, number of passes, and cutting direction. Results are compared against a number of response factors defining the process efficiency (i.e. kerf depth, mass removal, and specific energy consumption) and the cut quality (i.e. heat-affected zone, kerf width, and edge surface roughness). It is reported that the majority of these process characteristics are significantly affected by the structure of the wood under test.

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Section: Experimental Apparatusmentioning

confidence: 99%

Statistical analysis of ytterbium-doped fibre laser cutting of dry pine wood

Hernandez-Castaneda

Sezer

Li³

2009

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…In particular, 2μm pulsed lasers with ns pulses and kHz repetition rate generated from Tm-doped fiber lasers have been gaining popularity in applications such as laser surgery, multi-photon microscopy, eye-safe LIDAR, laser ranger finders and wavelength conversion to mid-or far-infrared 1,4 . Various methods of generating pulsed 2μm lasers have been reported to date: Q-switched Tm-doped silica fibers to generate relatively longer pulses 2,3 , ranging from 100ns to several hundred nanoseconds; mode-locked Q-switched Tm-doped fiber laser can generate high repetition and short pulses of picoseconds to several hundred femtoseconds 6,7 ; gain-switched Tm-doped fiber laser can generate 2μm pulses with kHz repetition rate and pulsewidth ranging from several tens to 100 ns 1,5,8 .…”

Section: Introductionmentioning

confidence: 99%

A monolithic thulium doped single mode fiber laser with 1.5ns pulsewidth and 8kW peak power

Ding¹,

Sampson²,

Carter³

et al. 2011

SPIE Proceedings

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Here we report a compact monolithic 2000nm pulsed laser with a single spatial mode output, ~1.5ns pulse duration, 8kW peak power and >200mW average power at 20 kHz repetition rate. The gain-switched laser, consisting of a pair of fiber Bragg gratings and 0.5m of thulium-doped single cladding fiber, was core pumped by a high peak power pulsed 1.5μm laser. When the input pulse energy of the 20 kHz pump pulses was sufficient enough to saturate the Thulium doped fiber, a stable 20 kHz pulse train was observed with measured linewidth of 0.05nm which corresponds to the limit of resolution for the Optical Spectrum Analyzer. This compact, pulsed 2000 nm laser, to the authors' limited knowledge, represents the first Tm-doped fiber laser with 8kW peak power and several ns pulse duration; which is less than the previously reported tens of ns pulsewidth previously reported from gain-switched Tm-doped fiber lasers.

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“…Doped ions in the inner core absorb pump energy by the role of the heat source function 𝑄(𝑟, 𝑧), and at the same time, it is equivalent to one clad based on no heat source of the inside and outside clads. The steady state heat conduction equation, [7] because longitudinal heat conduction in the laser medium affects a very small area near or at the pumping face, reads…”

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confidence: 99%

Estimation of the Maximum Output Power of Double-Clad Photonic Crystal Fiber Laser

Chen

Wang²,

2012

Chinese Phys. Lett.

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Compared with traditional optical fiber lasers, double-clad photonic crystal fiber (PCF) lasers have larger surfacearea-to-volume ratios. With an increase of output power, thermal effects may severely restrict output power and deteriorate beam quality of fiber lasers. We utilize the heat-conduction equations to estimate the maximum output power of a double-clad PCF laser under natural-convection, air-cooling, and water-cooling conditions in terms of a certain surface-volume heat ratio of the PCF. The thermal effects hence define an upper power limit of double-clad PCF lasers when scaling output power.

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The road to kilowatt fiber lasers

Cited by 6 publications

References 32 publications

Statistical analysis of ytterbium-doped fibre laser cutting of dry pine wood

Statistical analysis of ytterbium-doped fibre laser cutting of dry pine wood

A monolithic thulium doped single mode fiber laser with 1.5ns pulsewidth and 8kW peak power

Estimation of the Maximum Output Power of Double-Clad Photonic Crystal Fiber Laser

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