&lt;title&gt;Micromachining with ultrashort laser pulses: from basic understanding to technical applications&lt;/title&gt;

Dausinger, Friedrich; Hügel, H.; Konov, V. I.

doi:10.1117/12.537496

Cited by 118 publications

(78 citation statements)

References 6 publications

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“…When using laser ablation for surface finishing melt deposits are not desired. They can be avoided by reducing the energy density slightly above the ablation threshold [20]. The drawback will be a significant reduction of the ablation rate.…”

Section: Discussionmentioning

confidence: 99%

“…However, this will result in a higher technical effort regarding the laser source and will therefore lead to a significant increase in costs. Thus the pulse duration should always be chosen as short as necessary in order to achieve a satisfying result [20] but as long as possible to keep costs at a low level. For the manufacturing of hip joint prosthesis shafts an accuracy e.g., in a micrometre range would not lead to better long-term performance.…”

Section: Discussionmentioning

confidence: 99%

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Manufacturing of Medical Implants by Combination of Selective Laser Melting and Laser Ablation

Hallmann

Glockner

Daniel

et al. 2015

Lasers Manuf. Mater. Process.

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The perfect fit of hip stem prostheses is supposed to have positive effects on their lifetime performance. Moreover, the ingrowth of tissue into the surface of the implant has to be assured to create a firm and load bearing contact. For the manufacturing of customized hip stem prostheses, the technology of Selective Laser Melting has shown promising results. Poor surface quality, however, makes it necessary to finish up the part by e.g., sand blasting or polishing. With the use of laser ablation for postprocessing, reproducible and functionalized surface morphologies might be achievable. Hence, with the motive to produce customized hip stem prostheses, a combined process chain for both mentioned laser technologies is developed. It is examined what type of surface should be produced at which part of the process chain. The produced implants should contain the demanded final surface characteristics without any conventional post-processing. Slight advantages for the Selective Laser Melting regarding the accuracy for different geometrical structures of 400 μm depth were observed. However, an overall improvement of surface quality after the laser ablation process in terms of osseointegration could be achieved. A complete laser based production of customized hip stem implants is found to be with good prospects.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Manufacturing of Medical Implants by Combination of Selective Laser Melting and Laser Ablation

Hallmann

Glockner

Daniel

et al. 2015

Lasers Manuf. Mater. Process.

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show abstract

“…Comparing with the results using ns or ps lasers, there is a large amount of melt droplets redeposited on the hole edge 21 and a heat-affected zone is observed around the hole edge affecting the sharpness and quality of the hole. 22 The comparison with ns and ps laser drilling results clearly shows the advantage of fs laser drilling.…”

Section: Optical Engineeringmentioning

confidence: 99%

Micro-hole drilling and cutting using femtosecond fiber laser

2014

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Abstract. Micro-hole drilling and cutting in ambient air are presented by using a femtosecond fiber laser. At first, the micro-hole drilling was investigated in both transparent (glasses) and nontransparent (metals and tissues) materials. The shape and morphology of the holes were characterized and evaluated with optical and scanning electron microscopy. Debris-free micro-holes with good roundness and no thermal damage were demonstrated with the aspect ratio of 8∶1. Micro-hole drilling in hard and soft tissues with no crack or collateral thermal damage is also demonstrated. Then, trench micromachining and cutting were studied for different materials and the effect of the laser parameters on the trench properties was investigated. Straight and clean trench edges were obtained with no thermal damage.

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“…[5] Ultra-short pulsed fiber lasers at the level of picoseconds are being widely applied in the fields of industrial manufacture, medical treatment, telecommunication, military and so on [6] because they have high peak power and good thermal stability. At present, the average power output of an all-fiber master oscillator power amplifier (MOPA) picosecond laser system has reached more than 300 W. [6] However, the seeder is not consistent with all fibers and the seeder's power is too low to require more series to be amplified [7−9] as it causes obvious spectral broadening. Some reports are not on all-fiber systems and this will cause complex laser systems.…”

mentioning

confidence: 99%

Compact All-Fiber 102 W Picosecond MOPA Laser with a Narrow Spectral Linewidth

Ren

Zhou

et al. 2011

Chinese Phys. Lett.

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We report an all-fiber-based master oscillator power amplifier picosecond ytterbium-doped fiber laser with an average power of 102 W and a spectral line width of 0.1 nm. The seed source is a compact single mode passively mode-locked fiber laser with an average power of 2.48 W. Finally, the laser maximum average output power of 102 W picosecond pulses is realized by a direct all-fiber amplifier structure in one stage. The experiment enables the optical-to-optical conversion efficiency to reach 61.4%, with the central wavelength of 1063.7nm. A significant feature of this experiment is the spectral line width of 0.1 nm. The spectrum has no broadening or nonlinear effects when the pump is strengthened.

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<title>Micromachining with ultrashort laser pulses: from basic understanding to technical applications</title>

Cited by 118 publications

References 6 publications

Manufacturing of Medical Implants by Combination of Selective Laser Melting and Laser Ablation

Manufacturing of Medical Implants by Combination of Selective Laser Melting and Laser Ablation

Micro-hole drilling and cutting using femtosecond fiber laser

Compact All-Fiber 102 W Picosecond MOPA Laser with a Narrow Spectral Linewidth

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