Holographic characterization and laser structuring of a microphone membrane

We present a rapid-prototyping process to fabricate aspherical lens arrays based on surface deformation due to thermal expansion of PDMS. Using laser-structuring and molding in combination with an FEM-based shape optimization, we were able to design, fabricate and characterize different micro-lens arrays. This fabrication process can be used for almost any kind of arbitrary lens shape, which allows for a large design freedom for micro lenses.

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Picosecond laser structuring of monocrystalline silicon surface

10.1117/12.2053549 ◽

2013 ◽

Author(s):

Igor Guk ◽

Galina Shandybina ◽

Eugeny Yakovlev ◽

Leonid Golovan

Keyword(s):

Silicon Surface ◽

Picosecond Laser ◽

Monocrystalline Silicon ◽

Laser Structuring

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Enhanced performance and lifetime of lithium-ion batteries by laser structuring of graphite anodes

Applied Energy ◽

10.1016/j.apenergy.2021.117693 ◽

2021 ◽

Vol 303 ◽

pp. 117693

Author(s):

Johannes Kriegler ◽

Lucas Hille ◽

Sandro Stock ◽

Ludwig Kraft ◽

Jan Hagemeister ◽

...

Keyword(s):

Lithium Ion Batteries ◽

Lithium Ion ◽

Laser Structuring ◽

Graphite Anodes

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Theoretical study of spatiotemporal focusing for in-bulk laser structuring of dielectric

Journal of the Optical Society of America B ◽

10.1364/josab.443320 ◽

2021 ◽

Author(s):

Paul Quinoman ◽

Guillaume Duchateau ◽

Benoit Chimier

Keyword(s):

Theoretical Study ◽

Laser Structuring

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Femtosecond laser structuring of permeable and resorbable biomaterial

Current Directions in Biomedical Engineering ◽

10.1515/cdbme-2021-2182 ◽

2021 ◽

Vol 7 (2) ◽

pp. 713-716

Author(s):

Swen Grossmann ◽

Sabine Illner ◽

Robert Ott ◽

Grit Rhinow ◽

Carsten Tautorat ◽

...

Keyword(s):

Femtosecond Laser ◽

Biomedical Applications ◽

Mechanical Characteristics ◽

Membrane Properties ◽

Fiber Network ◽

Laser Technology ◽

Laser Structuring ◽

Wide Range ◽

Nanofiber Membranes ◽

Post Production

Abstract Bioresorbable nanofiber nonwovens with their fascinating properties provide a wide range of potential biomedical applications. Modification of the material enables the adjustment of mechanical and biological characteristics depending on the desired application. Due to the nanosized fiber network, post-production structuring is very challenging. Within this study, we use femtosecond laser technology for structuring permeable and resorbable electrospun poly-L-lactide (PLLA) membranes. We show that this post-production process can be used without disturbing the fiber network near the structured areas. Furthermore, the modification of the water permeability and mechanical characteristics due to the laser structuring was investigated. The results prove femtosecond laser technology to be a promising method for the adjustment of the membrane properties and which in consequence can help to optimize cell adhesion, enable revascularization and open up applications of nanofiber membranes in personalized medicine.

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Selective etching of 10 MHz repetition rate fs-laser inscribed tracks in YAG

EPJ Web of Conferences ◽

10.1051/epjconf/202125510003 ◽

2021 ◽

Vol 255 ◽

pp. 10003

Author(s):

Kore Hasse ◽

Detlef Kip ◽

Christian Kränkel

Keyword(s):

Aspect Ratio ◽

Repetition Rate ◽

Laser System ◽

Selective Etching ◽

Etching Process ◽

Acid Mixture ◽

Laser Structuring ◽

Order Of Magnitude ◽

Fs Laser

We investigated fs-laser structuring of YAG crystals at high writing velocities up to 100 mm/s using a commercial 10 MHz fs-laser system supplied by Coherent Inc. and selective etching of these structures for fabrication of ultrahigh aspect ratio microchannels. Usage of a diluted acid mixture of 22% H3PO4 and 24% H2SO4 accelerated the etching process significantly to an etching parameter D of 11.2 μm2/s, which is three times higher than previously reported. Additionally, the selectivity of the etching process was increased by an order of magnitude.

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Laser-Induced Interdigital Structured Graphene Electrodes Based Flexible Micro-Supercapacitor for Efficient Peak Energy Storage

Molecules ◽

10.3390/molecules27010329 ◽

2022 ◽

Vol 27 (1) ◽

pp. 329

Author(s):

Apurba Ray ◽

Jenny Roth ◽

Bilge Saruhan

Keyword(s):

Energy Storage ◽

Power Density ◽

Discharge Rate ◽

Polymer Gel ◽

Polymer Gel Electrolyte ◽

Long Cycle Life ◽

Portable Electronics ◽

Peak Energy ◽

Laser Structuring ◽

Self Powered

The rapidly developing demand for lightweight portable electronics has accelerated advanced research on self-powered microsystems (SPMs) for peak power energy storage (ESs). In recent years, there has been, in this regard, a huge research interest in micro-supercapacitors for microelectronics application over micro-batteries due to their advantages of fast charge–discharge rate, high power density and long cycle-life. In this work, the optimization and fabrication of micro-supercapacitors (MSCs) by means of laser-induced interdigital structured graphene electrodes (LIG) has been reported. The flexible and scalable MSCs are fabricated by CO2-laser structuring of polyimide-based Kapton ® HN foils at ambient temperature yielding interdigital LIG-electrodes and using polymer gel electrolyte (PGE) produced by polypropylene carbonate (PPC) embedded ionic liquid of 1-ethyl-3-methyl-imidazolium-trifluoromethansulphonate [EMIM][OTf]. This MSC exhibits a wide stable potential window up to 2.0 V, offering an areal capacitance of 1.75 mF/cm2 at a scan rate of 5.0 mV/s resulting in an energy density (Ea) of 0.256 µWh/cm2 @ 0.03 mA/cm2 and power density (Pa) of 0.11 mW/cm2 @0.1 mA/cm2. Overall electrochemical performance of this LIG/PGE-MSC is rounded with a good cyclic stability up to 10,000 cycles demonstrating its potential in terms of peak energy storage ability compared to the current thin film micro-supercapacitors.

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