Studies of Femtosecond Laser-Processed Nitinol

Zheng, Hong; Zareena, A. Rahmath; Huang, Han; Lim, Gwon

doi:10.4028/www.scientific.net/msf.437-438.277

Cited by 18 publications

(14 citation statements)

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“…Redeposit of molten glass on machined surfaces is difficult to remove, which significantly reduces the surface quality. With advancement of ultrashort lasers, surface as well as sub-surface machining has been the focus of many studies recently [1][2][3][4][5][6]. Ultrashort (femtosecond or Fs) laser pulses offer many advantages over long pulse lasers (nanosecond).…”

Section: Introductionmentioning

confidence: 99%

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Polarisation-independence of femtosecond laser machining of fused silica

Zheng¹,

Zhou²,

Qian³

et al. 2004

Applied Surface Science

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Section: Introductionmentioning

confidence: 99%

“…Therefore, any energy transfer to the target material is confined to a very small volume. Precise materials removal with minimal heat affected zone is important in electronics [3,5], biomedical [6] and photonics applications [1,2,4].…”

Section: Introductionmentioning

confidence: 99%

Polarisation-independence of femtosecond laser machining of fused silica

Zheng¹,

Zhou²,

Qian³

et al. 2004

Applied Surface Science

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“…Also, the laser can be used to process a wide range of materials and have the capability to fabricate feature sizes in micro scales. X-ray Diffractometer (XRD) analysis of the femtosecond laserprocessed shape memory alloys has already supported the belief of nonthermal machining [6].…”

Section: Introductionmentioning

confidence: 93%

Ultrashort pulse laser micromachined microchannels and their application in an optical switch

Liu

Wan

Lim

et al. 2005

Int J Adv Manuf Technol

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The capability of direct writing makes ultrashort pulse laser significant in the microfabrication of MEMS devices based on polymer and glass. In particular, nanosecond and femtosecond lasers are able to transfer the adequate energy in femtosecond intervals for the removal of the materials. Because of its advantages, just like the small feature size, smooth finishing surface, flexible structuring and the minimum thermal effect, ultrashort pulse lasers have become a convincing technique with the high peak power. This paper presents the femtosecond laser machining results of the polycarbonate, aluminosilicate glasses and nanosecond laser machining of aluminosilicate glasses. The microchannels with the critical micron-scale dimensions and the sub-micron scale surface roughness were achieved by the optimized operating parameters of the laser. The major influence factors such as cutting speed, power energy, and power stability were analyzed to obtain the optimized parameters for the fabrication of the microchannels for a bubble switch. The ultrashort pulse laser micromachining was applied in the prototype of a bubble optical switch. By miniaturization of the structure of the microchannel, the switch speed can be promisingly improved.

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“…Stents can be made of many kinds of biocompatible materials, one of which is nickel-titanium alloy (nitinol), which is widely used for self-expandable stents. It has excellent shape memory, pseudo-elasticity, biocompatibility and very high corrosion resistance [1].…”

Section: Introductionmentioning

confidence: 99%

Underwater femtosecond laser micromachining of thin nitinol tubes for medical coronary stent manufacture

Muhammad

2012

Appl. Phys. A

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Microprofiling of medical coronary stents has been dominated by the use of Nd:YAG lasers with pulse lengths in the range of a few milliseconds, and material removal is based on the melt ejection with a high-pressure gas. As a result, recast and heat-affected zones are produced, and various post-processing procedures are required to remove these defects. This paper reports a new approach of machining stents in submerged conditions using a 100-fs pulsed laser. A comparison is given of dry and underwater femtosecond laser micromachining techniques of nickeltitanium alloy (nitinol) typically used as the material for coronary stents. The characteristics of laser interactions with the material have been studied. A femtosecond Ti:sapphire laser system (wavelength of 800 nm, pulse duration of 100 fs, repetition rate of 1 kHz) was used to perform the cutting process. It is observed that machining under a thin water film resulted in no presence of heat-affected zone, debris, spatter or recast with fine-cut surface quality. At the optimum parameters, the results obtained with dry cutting showed nearly the same cut surface quality as with cutting under water. However, debris and recast formation still appeared on the dry cut, which is based on material vaporization. Physical processes involved during the cutting process in a thin water film, i.e. bubble formation and shock waves, are discussed. N. Muhammad · L. Li ( ) Laser

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Studies of Femtosecond Laser-Processed Nitinol

Cited by 18 publications

References 0 publications

Polarisation-independence of femtosecond laser machining of fused silica

Polarisation-independence of femtosecond laser machining of fused silica

Ultrashort pulse laser micromachined microchannels and their application in an optical switch

Underwater femtosecond laser micromachining of thin nitinol tubes for medical coronary stent manufacture

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