Fibers and fiber-optic components for high-power fiber lasers

Zimer, H.; Kozak, M.M.; Liem, A.; Flohrer, Frank; Doerfel, F.; Riedel, Peter; Linke, S.; Horley, R.; Ghiringhelli, F.; Desmoulins, S.; Zervas, M.N.; Kirchhof, J.; Unger, Sonja; Jetschke, Sylvia; Peschel, Thomas; Thomas, Sabu

doi:10.1117/12.879622

Cited by 40 publications

(29 citation statements)

References 12 publications

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“…For Yb-APS fiber, refractive index difference n of the fiber core relative to undoped SiO 2 is determined by Yb 3+ ions content, the molar ratio of Al and P, as well as Al and P content [27], [28], [31]. Aiming for high suppression of PD and low NA core, nearly equal content of Al and P was designed in the whole fiber core [24], [31], [32].…”

Section: Fiber Composition Designmentioning

confidence: 99%

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Yb-Doped Aluminophosphosilicate Triple-Clad Laser Fiber With High Efficiency and Excellent Laser Stability

et al. 2019

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We fully demonstrated an ytterbium (Yb) doped triple-clad laser fiber with intense pump absorption, high efficiency, and laser stability. P 5+ /Al 3+ molar ratio in the central region of fiber core was specially designed to be ∼1.08 for compensating P 2 O 5 evaporation, while the ratio in the outer region was set as ∼0.92 for obtaining a flattened refractive index profile. Applying a two-stage deposition process, one-time collapse technique, low-temperature multi-times sintering, and suitable flow of pure POCl 3 during sintering and collapsing process were instrumental in decreasing and offsetting element evaporation. Measured in an all-fiber master oscillator power amplifier configuration, the 7-m-long fiber obtained 1.39 kW nearsingle-mode laser output at 1079.6 nm with a slope efficiency of 85.2% and a beam quality M 2 of 1.36. Output laser spectrum with no sign of nonlinear-related peaks and a narrow 3-dBbandwidth of ∼0.33 nm was obtained. The fiber-based laser setup was kept at the maximum power for 1 h with power degradation less than 0.21%. The results demonstrated Yb-doped aluminophosphosilicate triple-clad fiber is a highly competitive candidate for commercial high-power laser and high-power narrow-linewidth fiber laser.

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Section: Fiber Composition Designmentioning

confidence: 99%

“…So, it can suppress heterogeneity formation. Here, as total numbers of P is more than that of Al, the n can be expressed as [27], [28], [31]:…”

Section: Fiber Composition Designmentioning

confidence: 99%

Yb-Doped Aluminophosphosilicate Triple-Clad Laser Fiber With High Efficiency and Excellent Laser Stability

et al. 2019

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“…Explicitly, dependent on available pump brightness and the applied pump coupling concept different architectures for high power fiber lasers have evolved during the recent years. Some of them are simple high power oscillators, others are made of master oscillators spliced to powerful amplifiers to constitute a Master-Oscillator Power-Amplifier (MOPA) system [14].…”

Section: Fiber Lasermentioning

confidence: 99%

Essential building blocks for a flexible approach to laser source design

Deile¹,

Doberitzsch

2013

SPIE Proceedings

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During the first 20 years of TRUMPF's existence as a laser company, it developed a reputation for standard products for applications, now referred to as the traditional industrial applications: laser cutting and welding of steel and aluminum. During the same time, TRUMPF acquired five basic technology platforms -fast-flow and diffusion-cooled CO 2 lasers, thin disk, diode and fiber lasers.The standard products cover only a small section of the multi-dimensional parameter space that can be covered with these five basic technologies. These platforms, however, provide enormous flexibility and highly reliable building blocks that are now used to fill white areas in the parameter space, enabling novel applications unrelated to the original applications for these technologies.Presented are some examples of how the scaling of these technologies has led to unique and novel laser devices and applications. They include the generation of EUV with CO 2 lasers, short-pulse applications with diffusion-cooled and fast-flow CO 2 lasers for processing of composite materials and plastics. Laser output power, the traditional main characteristic for CO 2 lasers, made way for pulse energies, pulse lengths and wavelength. The traditional cw thin disk laser platform was transformed into short and ultra-short pulse lasers with wavelengths down to 343 nm. Diode lasers evolved from low brightness pump sources for thin disk lasers to diode direct lasers.This flexibility will ensure that remaining white spaces in the parameter space can be filled in the future as required.

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“…Moreover, the isolation between the pump pathway and high power signal light in the DSCCP fiber can prevent the destructive effect of the optical feedback of signal light (e.g., caused by the Rayleigh scattering and output port reflection) on the pump devices such as the pump laser diodes (LD) and pump combiners. In 2011, H. Zimer et al reported a DSCCP fiber laser system with a single-stage amplifier which generated a kilowatt of output power at 1070-nm with an optical-to-optical efficiency of 65% [21]. However, to the best of our knowledge, the cascaded amplifier of the DSCCP fiber has not been reported.…”

Section: Introductionmentioning

confidence: 99%

A Kilowatt All-Fiber Cascaded Amplifier

Huang

Cao

et al. 2015

IEEE Photon. Technol. Lett.

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A kilowatt all-fiber cascaded amplifier is demonstrated with a distributed side-coupled cladding-pumped Yb-doped fiber for the first time, to the best of our knowledge. Two-stage cascaded amplification is realized in the amplifier, with a total output power of 1.009 kW and an optical-to-optical efficiency of 76.8% with respect to launched pump power. The output beam quality of the cascaded amplifier is also measured, and the M 2 factor is about 2.1. The results illuminate that the cascaded amplifier should be beneficial to the power scalability of fiber laser systems.Index Terms-Ytterbium doped fiber amplifiers, Fiber lasers, High power amplifiers.

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Fibers and fiber-optic components for high-power fiber lasers

Cited by 40 publications

References 12 publications

Yb-Doped Aluminophosphosilicate Triple-Clad Laser Fiber With High Efficiency and Excellent Laser Stability

Yb-Doped Aluminophosphosilicate Triple-Clad Laser Fiber With High Efficiency and Excellent Laser Stability

Essential building blocks for a flexible approach to laser source design

A Kilowatt All-Fiber Cascaded Amplifier

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