Ultrafast laser microwelding for transparent and heterogeneous materials

2008 ◽  
Author(s):  
Kazuyoshi Itoh ◽  
Takayuki Tamaki
Keyword(s):  
Heterogeneous Materials ◽  
Ultrafast Laser ◽  
Laser Microwelding

Ultrafast Laser Microwelding

2007 ◽  
Vol 18 (12) ◽  
pp. 46 ◽  
Author(s):  
Takayuki Tamaki ◽  
Wataru Watanabe ◽  
Kazuyoshi Itoh
Keyword(s):  
Ultrafast Laser ◽  
Laser Microwelding

scholarly journals Characteristics of an Implantable Blood Pressure Sensor Packaged by Ultrafast Laser Microwelding

Sensors ◽  
2019 ◽  
Vol 19 (8) ◽  
pp. 1801 ◽  
Author(s):  
Sungil Kim ◽  
Jaesoon Park ◽  
Sangkyun So ◽  
Sanghoon Ahn ◽  
Jiyeon Choi ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Laser Welding ◽  
Pressure Sensor ◽  
Ultrafast Laser ◽  
Large Temperature ◽  
Implantable Sensors ◽  
Welding Seam ◽  
Packaging Process ◽  
Resonance Frequencies ◽  
Laser Microwelding

We propose a new packaging process for an implantable blood pressure sensor using ultrafast laser micro-welding. The sensor is a membrane type, passive device that uses the change in the capacitance caused by the membrane deformation due to applied pressure. Components of the sensor such as inductors and capacitors were fabricated on two glass (quartz) wafers and the two wafers were bonded into a single package. Conventional bonding methods such as adhesive bonding, thermal bonding, and anodic bonding require considerable effort and cost. Therefore CO2 laser cutting was used due to its fast and easy operation providing melting and bonding of the interface at the same time. However, a severe heat process leading to a large temperature gradient by rapid heating and quenching at the interface causes microcracks in brittle glass and results in low durability and production yield. In this paper, we introduce an ultrafast laser process for glass bonding because it can optimize the heat accumulation inside the glass by a short pulse width within a few picoseconds and a high pulse repetition rate. As a result, the ultrafast laser welding provides microscale bonding for glass pressure sensor packaging. The packaging process was performed with a minimized welding seam width of 100 μm with a minute. The minimized welding seam allows a drastic reduction of the sensor size, which is a significant benefit for implantable sensors. The fabricated pressure sensor was operated with resonance frequencies corresponding to applied pressures and there was no air leakage through the welded interface. In addition, in vitro cytotoxicity tests with the sensor showed that there was no elution of inner components and the ultrafast laser packaged sensor is non-toxic. The ultrafast laser welding provides a fast and robust glass chip packaging, which has advantages in hermeticity, bio-compatibility, and cost-effectiveness in the manufacturing of compact implantable sensors.

Numerical Analysis on the Feasibility of Laser Microwelding of Metals by Femtosecond Laser Pulses Using ABAQUS

2008 ◽  
Vol 130 (6) ◽  
Author(s):  
Dongkyun Lee ◽  
Elijah Kannatey-Asibu
Keyword(s):  
Pulse Duration ◽  
Ultrafast Lasers ◽  
Short Pulse ◽  
Material Model ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Ultrafast Laser ◽  
Temperature Model ◽  
Laser Microwelding ◽  
Two Temperature

Ultrafast lasers of subpicosecond pulse duration have the potential for laser microwelding of micronscale fusion zone. Due to the extremely short pulse duration, laser-metal interaction involving ultrafast laser pulses should be analyzed using the two-temperature model. In this study, the two-temperature model is analyzed using ABAQUS to study the feasibility of laser microwelding with ultrafast laser. A material model is constructed using material properties and the subsurface boiling model. The model is validated using experimental results from the literature. Laser processing parameters of repetition rate, pulse duration, and focal radius are then investigated, in terms of molten pool generated in the material and requirements on those parameters for laser microwelding using ultrafast lasers are discussed.

Ultrafast laser microwelding of optical materials

2018 ◽  
Author(s):  
Duncan P Hand ◽  
Richard M Carter ◽  
Robert R Thomson ◽  
M J Daniel Esser ◽  
Michael Troughton ◽  
...  
Keyword(s):  
Optical Materials ◽  
Ultrafast Laser ◽  
Laser Microwelding

scholarly journals Towards industrial ultrafast laser microwelding: SiO_2 and BK7 to aluminum alloy

2017 ◽  
Vol 56 (16) ◽  
pp. 4873 ◽  
Author(s):  
Richard M. Carter ◽  
Michael Troughton ◽  
Jianyong Chen ◽  
Ian Elder ◽  
Robert R. Thomson ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Ultrafast Laser ◽  
Laser Microwelding
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