Nanosecond laser-induced ablation and laser-induced shockwave structuring of polymer foils down to sub-μm patterns

Lorenz, Pierre; Bayer, Lukas; Ehrhardt, Martin; Zimmer, Klaus; Engisch, Lutz

doi:10.1117/12.2079434

Cited by 4 publications

(5 citation statements)

References 34 publications

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“…5) where an ablation threshold from ~ 0.023 µJ (at N = 1) to ~ 0.009 µJ (at N = 1000) was found The experimental found laser ablation threshold for a single pulse (N = 1) implies a laser fluence threshold of Φ th ~ 22 mJ/cm² for a Gaussian radius of 5.7 µm. This value is larger than the experimental value of ~ 6 mJ/cm² for ns laser (λ = 355 nm, 2-3 ns) [10] and slightly smaller compared to 30 -70 mJ/cm² for KrF Excimer laser ablation (λ = 248 nm, ∆tp = 25 ns) [4]. Similar to other studies the reduction of the ablation threshold with increasing number was found (see Fig.…”

Section: • Ablation Ratesupporting

confidence: 84%

“…Short and ultra-short pulse laser irradiation of polymers can cause laser ablation resulting from the decomposition of the material due to disintegration of hydrocarbon chains. Laser ablation is a well-established tool for surface patterning, structuring and modification of polymer films and foils [2][3][4][5][6][7][8][9]. The ablation process was already studied for different polymers like polytetrafluoroethylene (PTFE), polyether ether ketone (PEEK), polyethylene terephthalate (PET) and polycarbonate (PC) [2,10].…”

Section: Introductionmentioning

confidence: 99%

“…Polyimide (PI) is a well-qualified polymer for various applications due to its exceptional optical, chemical, thermal and electrical properties [10]. The laser ablation process of PI was studied for very different laser sources with pulse durations from femtosecond (fs) to nanosecond (ns) and with wavelengths ranging from infrared to ultraviolet [4,7,8,[11][12][13][14][15][16]. The ablation of polymers can be of photothermal or photochemical nature [5]; both cause finally the decomposition of the polymer and the formation of gaseous products.…”

Section: Introductionmentioning

confidence: 99%

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High Pore Density Polyimide Membrane Production by PS Laser Pulses

2022

JLMN

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High pore density membranes exhibit various applications, especially in microfiltration, bioseparation, microbiology and medicine. The laser ablation process allows the fabrication of membranes with high pore density and pore diameter in the µm and sub-µm range. Ultrashort laser pulses allows the efficient and precise fabrication of pores in polymer foils due to the high repetition rate and the low thermal effects. Polyimide (PI) foils with a thickness of 13 µm were irradiated by ultraviolet picosecond laser radiation. The fabricated membranes have a pore diameter from ~0.7 µm to 75 µm in dependence on the laser parameter. Furthermore, high pore density up to ~23500 mm -2 , high-precision pores with standard deviation of pore diameter less than 10 % and high areal pore density up to ~12 % were achieved. The detailed analysis of the pore size at the front and rear side in correlation to the laser parameter enable an empiric description of the pore size -laser parameter dependency which allows the optimisation of the pore density.

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Section: • Ablation Ratesupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High Pore Density Polyimide Membrane Production by PS Laser Pulses

2022

JLMN

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“…The development of novel engineered materials involving the exposure of PI to high energy ionizing radiation is an actively evolving engineering field where the efforts of many researchers are focused. Reports on PI irradiation with electron beams of different energy and exposure to VUV photons (usually in the form of laser irradiation) to improve PI's radiation resistance (e.g., [175]) and surface properties (e.g., [19,[176][177][178][179][180][181]) have been published. Moreover, efforts were undertaken to improve the atomic oxygen (AO) erosion resistance of PI for low Earth orbit (LEO) applications.…”

Section: Discussionmentioning

confidence: 99%

Review of Radiation-Induced Effects in Polyimide

Plis¹,

Engelhart²,

Cooper

et al. 2019

Applied Sciences

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Polyimide (PI, Kapton-H®) films are widely utilized in the spacecraft industry for their insulating properties, mechanical durability, light weight, and chemical resistance to radiation. Still PI materials remain exposed to a combination of high-energy electrons, protons, and ultraviolet (UV) photons, particles primarily responsible for radiation-induced damage in geosynchronous Earth orbit (GEO), which drastically change PI’s properties. This work reviews the effect of electron, proton, and UV photon irradiation on the material properties (morphology, absorption, mechanical properties, and charge transport) of PI. The different damaging mechanisms and chemical consequences that drive changes in the material properties of PI caused by each individual kind of irradiation will be discussed in detail.

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“…Lorenz et al [ 4 ] presented a method for the nanostructuring of sapphire using time‐modulated nanosecond laser pulses. The related simulation model based on the finite‐element method allows a basic understanding of the dependencies on the laser parameters as well as the processes but is only able to reproduce idealized single‐point ablations.…”

Section: Introductionmentioning

confidence: 99%

Structure and Validation of a Kinematic Surface Simulation Model for the Direct Laser Writing Process

Wieland,

Gärtner,

Wieland

2024

Adv Eng Mater

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The article introduces to the structure and validation of a Kinematic–Surface–Simulation–Model for the replication of laser‐structured surfaces and their impressions after hot embossing. The surface replication is accomplished by the stepwise Boolean intersection of a structured and digitised point‐ablation with the workpiece. The resulting surface is characterised according to ISO 25178. Resulting from the Kinematic–Simulation‐Principle, the model can be applied to a wide range of material–machine combinations in the field of laser‐structuring and enables a time–efficient, nanometre‐resolved replication of representative surfaces with a size up to several square millimetres. Within the validation process it was proven, that the main surface characteristics can be predicted by the model. Compared to AI‐approaches and numerical or multi‐physical simulations, preliminary studies are only needed to a very small extent. Furthermore, complex influences such as material and temperature related properties do not need separate consideration as they are taken into account by the digitised point‐ablation.This article is protected by copyright. All rights reserved.

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Nanosecond laser-induced ablation and laser-induced shockwave structuring of polymer foils down to sub-μm patterns

Cited by 4 publications

References 34 publications

High Pore Density Polyimide Membrane Production by PS Laser Pulses

High Pore Density Polyimide Membrane Production by PS Laser Pulses

Review of Radiation-Induced Effects in Polyimide

Structure and Validation of a Kinematic Surface Simulation Model for the Direct Laser Writing Process

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