JOURNAL OF LASER MICRO NANOENGINEERING

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Through-hole drilling of a 200-m-thick flame-retardant polyester-based film was investigated using a short-pulse CO2 laser with a pulse width of 304 ns.Percussion drilling was performed at a repetition rate of 200 Hz and a fluence of 10.7 J/cm 2 per pulse.Two irradiation methods were examined.One was conventional continuous irradiation, referred to as Continuous Irradiation in …

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Processing heat-sensitive materials like glass requires minimizing thermal damage, a challenge for conventional nanosecond lasers.While ultrashort pulsed lasers offer precision, their efficiency can be limited.This study presents method to enhance glass processing by using a mixed-pulse-train (MPT) of synchronized picosecond (ps) and nanosecond (ns) pulses.We demonstrate that t…

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To evaluate the antibacterial performance of laser-induced periodic surface structures (LIPSS) formed on SUS430 stainless steel (equivalent to AISI 430, ferritic stainless steel), surface patterns were fabricated using femtosecond laser pulses (wavelength: 1030 nm; pulse duration: 150 fs) with controlled fluence.Two types of LIPSS were produced with average ridge and valley wid…

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Fused silica is a cornerstone material in photonics thanks to its outstanding optical, thermal and mechanical robustness.Its surface can be selectively functionalized with CO lasers, whose strong infrared absorption confines energy to a thin layer and enables precise thermal effects-from annealing to ablation and laser polishing.Here we quantify how CO laser parameters govern c…

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An alternative approach to conventional fabrication methods for optical components is the laserbased process chain.In that case, precise form generation can be achieved using ultrashort pulse (USP) laser ablation.Precise control of the ablation depth and surface roughness is a crucial requirement for optical applications.Current developments in USP laser beam sources lead to an…

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Copper(II)-oxide-based femtosecond reductive laser sintering is applied to selectively produce high quality and flexible copper electrodes on ultra-thin glass with thicknesses between 30 and 100 m.To increase the precursor wettability and the later copper adhesion, the ultra-thin glass substrates are plasma activated.An amplified near infrared femtosecond laser combined with a …

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The feasibility of using beam shaped short femtosecond pulses in combination with a nonlinear frequency conversion process to create any arbitrary beam shape in the ultraviolet spectrum is shown.Broadband femtosecond pulses (800 nm centre, 30 nm Bandwidth FWHM, 50 fs) are shaped via a spatial light modulator (SLM) and converted to 400 nm in a subsequent second harmonic process …

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The integration of low-cost collaborative robots (cobots) into laser materials processing (LMP) holds significant promise, especially for small and medium-sized enterprises (SMEs).Technological advancements have reduced costs and increased laser system flexibility, broadening their application.Additionally, demographic changes and labor shortages highlight the need for adaptabl…

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This study addresses the challenges associated with scaling ablation rates while minimizing surface roughness for copper.By employing tailored flexible bursts, the temporal spacing and energy of individual pulses can be precisely manipulated, creating a high-dimensional parameter space for optimization.Traditional optimization methods are labor-intensive and time-consuming.Thus…

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In this study, we developed a machine-learning framework to predict the success of ultrafast laser microwelding of glass substrates based on plasma-emission spectra and laser-processing parameters.Ten-millimetre linear welds were produced under varying laser power, repetition rate, and scanning speed.The emission spectra collected during welding, combined with the corresponding…

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The integration of low-cost collaborative robots (cobots) into laser materials processing (LMP) holds significant promise, especially for small and medium-sized enterprises (SMEs).Technological advancements have reduced costs and increased laser system flexibility, broadening their application.Additionally, demographic changes and labor shortages highlight the need for adaptabl…

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An in-line monitoring system for ultra-short pulsed (USP) laser ablation was developed and assessed to two-dimensionally map the complete removal of a thin film.This method enables single pulse resolved monitoring based on Laser Induced Breakdown Spectroscopy (LIBS) for pulse repetition rates of up to 4 MHz.The transition from one 1.5 m thin layer to another during laser ablati…

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We report for the first time on the flexible and large-area 2D laser cutting of ultra-thin glass using an ultrashort pulsed laser robot (USPLR) system emitting at a wavelength of 1030 nm.To optimize the cutting quality of 100 m thick AF 32 eco ultra-thin glass substrate, experiments were performed with different laser pulse durations, laser pulse energies, laser pulse repetitio…

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We report on an automatic laser beam focus monitoring approach for an ultrashort pulsed laser robot system.The system integrates an ultrashort laser mounted on a link of a six-axis industrial articulated robot with a galvanometer scanner and an F-Theta lens mounted on the end of the last robot axis.This enables high precision micromachining using ultrashort pulsed laser over a …

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For the contacting of battery cells, a stable and time-efficient joining process is required, whereas primarily copper and aluminum materials with high electrical conductivity are used.To ensure a high level of automation and process efficiency, laser micro welding has established itself in industrial applications.Single-mode fiber lasers in the near-infrared range with high br…

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In this study, ultrashort pulse laser irradiation was performed on Polyether ether ketone (PEEK) while systematically varying the pulse duration and fluence.Distinct surface morphologies were observed with increasing pulse duration.Under identical pulse durations but varying fluences, laserirradiated craters exhibiting swelling were observed at fluences near to the threshold pe…

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The generation of periodic surface structures (LIPSS) using Laser is a well-known and extensively researched effect.The majority of known und studied LIPSS are generated by multi-pulse irradiation, with single-pulse LIPSS being currently under-researched.This study investigated the single-pulse generation of LIPSS on a silicon Si(100) surface covered with a SiO2 layer.The layer…

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Laser-assisted rock drilling presents a viable pathway to address limitations in conventional drilling methods, such as high bit wear and reduced efficiency in hard formations.This study investigates the softening behavior of limestone under continuous wave CO2 laser irradiation by varying key processing parameters: laser power (126-162 W), stand-off distance (6-8 mm), scanning…

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Indium Tin Oxide (ITO) is widely used material for example in displays or solar cells.In this work we focused on increasing the productivity and processing quality of ultra-short pulsed laser ablation of ITO with MHz and GHz bursts.Thick ITO films could not be ablated with one pulse, preventing optical stamping.With MHz bursts thick (200 nm) ITO films could be completely remove…

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The formation of ternary alloys induced by ultrashort pulsed laser irradiation was investigated.Thin films of Fe, Cr, and Ni were sequentially deposited onto a sapphire substrate.Laser irradiation was performed from the sapphire substrate side, with the focal point at the interface between the substrate and the metal layers.Energy-dispersive X-ray spectroscopy (EDS) analysis sh…