Fiber-coupled three-micron pulsed laser source for CFRP laser treatment

Nyga, Sebastian; Blass, David M.; Katzy, V.; Westphalen, Thomas; Jungbluth, Bernd; Hoffmann, Hans-Dieter

doi:10.1117/12.2288343

Cited by 3 publications

(4 citation statements)

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“…The frequency-converted laser provides up to 18 W of average power at a wavelength of 3012 nm and a pulse frequency of 12 kHz. A detailed presentation of the setup and the laser characteristics can be found in Reference [ 19 ].…”

Section: Methodology and Experimental Set-upmentioning

confidence: 99%

“…The laser radiation shall be provided by using a low cost industrial laser at 1064 nm and a subsequent efficient frequency conversion to 3 µm. First implementations of a 3 µm laser and bonding pre-treatment experiments were presented by the authors [ 8 , 18 , 19 ]. This paper focuses on the comparison of the pre-treatment results of adherents at a 3 µm wavelength with the results at wavelengths emitted by conventional lasers.…”

Section: Introduction and State Of The Artmentioning

confidence: 99%

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Composite Bonding Pre-Treatment with Laser Radiation of 3 µm Wavelength: Comparison with Conventional Laser Sources

et al. 2018

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To use the full potential of composite parts, e.g., to reduce the structural weight of cars or airplanes, a greater focus is needed on the joining technology. Adhesive bonding is considered favorable, superior joining technology for these parts. Unfortunately, to provide a structural and durable bond, a surface pre-treatment is necessary. Due to its high integration potential in industrial process chains, laser radiation can be a very efficient tool for this purpose. Within the BMBF-funded (German Federal Ministry of Education and Research) project GEWOL, a laser source that emits radiation at 3 µm wavelength (which shows significant advantages in theory) was developed for a sensitive laser-based bonding pre-treatment. Within the presented study, the developed laser source was compared with conventional laser sources emitting radiation at 355 nm, 1064 nm, and 10,600 nm in terms of application for a composite bonding pre-treatment. With the different laser sources, composites were treated, analytically tested, subsequently bonded, and mechanically tested to determine the bonding ability of the treated specimens. The results show a sensitive treatment of the surface with the developed laser source, which resulted in a very effective cleaning, high bonding strengths (over 32 MPa), and a good effectiveness compared with the conventional laser sources.

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Section: Methodology and Experimental Set-upmentioning

confidence: 99%

Section: Introduction and State Of The Artmentioning

confidence: 99%

Composite Bonding Pre-Treatment with Laser Radiation of 3 µm Wavelength: Comparison with Conventional Laser Sources

et al. 2018

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“…It was initially developed by Fraunhofer ILT to treat carbon-reinforced plastics (CFRP) and has already been presented in Ref. 14. The laser source generates up to 18 W of average power at a wavelength of 3 µm or up to 1.5 mJ of pulse energy at a pulse frequency of f R = 12 kHz and a pulse duration of τ = 90 ns.…”

Section: Pulsed Laser Sourcementioning

confidence: 99%

“…5,12,13 Commercially available laser sources like Er:YAG lasers fulfil the requirement of high pulse energy of up to several 100 mJ but are limited in the repetition rate and pulse duration. Novel 3 µm solid-state laser sources based on a frequency conversion setup can emit short pulses (ns) with high repetition rates (kHz) and sufficiently high pulse energies 14 for efficient hard tissue ablation.…”

Section: Introductionmentioning

confidence: 99%

Efficient and tissue-saving bone ablation with a pulsed 3 µm laser source

Giesen

Bochvarov

Müller

et al. 2023

Optical Interactions With Tissue and Cells XXXIV

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Thermo-mechanical hard tissue ablation with pulsed mid-infrared lasers is an efficient and minimally invasive method for precise bone cutting. The efficiency of the ablation process strongly depends on the absorption of laser radiation in the intracellular water of hard tissue. Therefore, 3 µm laser sources show high efficiency in bone ablation with a small heat affected zone. Until now, it was not possible to transfer this high efficiency into high ablation rates because of the limited repetition rate of commercially available laser sources. In this study, we demonstrate ablation experiments on bovine bone tissue utilizing a novel 3 µm laser source with a repetition rate of 12 kHz and nanosecond pulse duration. We optimized process parameters especially focus position, flow rate of a water spray system and pulse overlap for a fast and non-thermal ablation process. By optimizing the optical system, we were able to realize a fluence for fast bone ablation with rates of up to 2.2 mm 3 /s and a maximum ablation depth of 3.4 mm. For further increase of the depth-dependent ablation rate, it was possible to estimate required beam caustic and laser specifications.

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