Advanced pulsed and CW high-power fiber lasers

Nilsson, Johan; Grudinin, A.B.; Turner, P.W.

doi:10.1109/cleo.2000.907441

Cited by 11 publications

(7 citation statements)

References 6 publications

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“…Low facula qualitity and big focus facula , resulting in low density of focus power and slow cutting speed. 6.Big kerf width of laser cutting (power @ 50W, kerf width >50µm), resulting in low cutting precision. 7.…”

Section: Introductionmentioning

confidence: 98%

“…Heat affected zone expands, which directly influences the quality of stent. With the development and mature of fiber laser technologies, however, the industry begins to turn to fiber laser in medical device micro-machining 4,5,6,7 . Recent improvements in average laser power now make the fiber laser suitable for industrial cutting applications.…”

Section: Introductionmentioning

confidence: 99%

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Application of fiber laser used in the field of stent cutting and micromachining

Liu¹,

Liao

2005

SPIE Proceedings

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Based on the comparison of traditional laser and fiber laser cutting system, a fiber laser based micro-machining system is designed. The main modules of the micro-machining system and the key techniques are analyzed and the corresponding solution is proposed. In particular, the driving, control and modulation system are focused on, in which an SOC system is built up, and the corresponding hardware and software are described in detail. The pulse width and frequency modulation are achieved with software, by setting the related parameters via keyboard. The power, pulse length and pulse frequency can be tunable in our modulation system, which can meet the different laser requirement in various kinds of stents cutting and micro-machining.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Application of fiber laser used in the field of stent cutting and micromachining

Liu¹,

Liao

2005

SPIE Proceedings

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“…Theoretical pump-light conversions of more than 85% are possible, 2 but typical optical conversion efficiencies for Ytterbium ͑Yb͒ double-clad fiber lasers are 60 to 68%. 3,4 Average power levels up to 100 W are possible with air cooling. Since the overall efficiency is high, most fiber lasers are powered by a standard 110 V supply.…”

Section: Introductionmentioning

confidence: 99%

Laser microfabrication of L605 cobalt-chromium cardiovascular stent implants with modulated pulsed Nd:YAG laser

Sudheer

Kothwala

Prathibha

et al. 2008

J. Micro/Nanolith. MEMS MOEMS

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Photonics modulation techniques can be effectively used for the laser microfabrication of biomedical implants to achieve better flexibility and control of the available optical power. These enable the processing and manufacturing of biomedical implants like cardiovascular stents and micro-metallic components with reduced heat affected zone ͑HAZ͒ and extremely precise edge cutting. Our investigation deals with the study of acousto-optic modulation of a pulsed Nd:YAG laser beam and further profile cutting of thin cobalt-chromium tubes for cardiovascular stent manufacturing. The acousto-optic modulator used in the investigations is a Bragg diffraction device. During one piercing process, the focused laser power is gradually varied from a low value and reaches the maximum as the beam goes deeper into the material. The optimum value for dwell time during which the laser piercing is occurring is found as 58 ms. A 14-step staircase modulating voltage with a maximum AC component of 900 mV was used, and the laser power was 4.4 W in TEM 00 operation. Pulsed Nd:YAG laser modulated using an acoustooptic device in the Bragg regime is capable of cutting extremely complex geometries of stents on L605 tubing. Laser cutting resulted in a kerf width of 22.5± 0.5 m. Precise strut dimensions of 112± 15 m for the subsidiary strut, 140± 15 m for the main strut, and 140± 15 m for the link were also obtained. Scanning electron microscopy ͑SEM͒ images of L605 stents illustrate the higher strength Co-Cr alloy L605 with the same ductility, its ability to be translated into thinner struts, and improved deliverability. L605 also exhibits enhanced radio visibility thanks to its tungsten content and exceptional work hardening rate for a uniform expansion with minimal recoil.

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“…The diode-pumped technology offers low maintenance cycles and high conversion efficiency. Theoretical pump-light conversions of more than 80% are possible [2] but typical optical conversion efficiencies for Ytterbium (Yb) double-clad fiber lasers are 60-70% [3,4]. Average power levels up to 100 W are possible with air-cooling.…”

Section: Fiber Laser For Micro Cutting Of Metalsmentioning

confidence: 99%

Fiber laser for micro-cutting of metals

Kleine¹,

Watkins

2003

SPIE Proceedings

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The fiber laser concept is proven technology for telecom applications where its single mode performance and reliability is essential. Newer generation diode-pumped fiber lasers are using pump diodes especially developed for telecom applications and therefore offer excellent controllability of the laser pulse length and pulse frequency. In recent years the output power of fiber lasers has increased steadily. This high power performance enables the fiber laser to serve industrial applications like marking. High power fiber lasers are now available at power levels sufficient for micro cutting applications. This paper presents micro cutting results with pulsed fiber lasers.

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Advanced pulsed and CW high-power fiber lasers

Cited by 11 publications

References 6 publications

Application of fiber laser used in the field of stent cutting and micromachining

Application of fiber laser used in the field of stent cutting and micromachining

Laser microfabrication of L605 cobalt-chromium cardiovascular stent implants with modulated pulsed Nd:YAG laser

Fiber laser for micro-cutting of metals

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