Laser Technology: Laser solution Online Q&A

This study demonstrates a high-efficiency, crack-free method for drilling high-aspect-ratio micro-holes in glass substrates using an infrared femtosecond laser equipped with GHz-burst technology. By employing a top-down percussion drilling strategy with a 1030 nm laser (50 pulses per burst at a 1 GHz intra-burst repetition rate), researchers achieved crack-free holes with aspect ratios exceeding 30 in soda-lime glass and up to 73 in fused silica. The process leverages the synergy of nonlinear absorption and localized thermal accumulation, effectively bypassing the limitations of traditional laser drilling, such as micro-cracks and large heat-affected zones. The study further elucidates a three-stage physical mechanism—surface ablation, deep-hole ablation, and drilling termination—providing critical insights into the dynamics of glass micro-machining for advanced photonic and microelectronic applications. Read More »

This article provides a comprehensive technical guide on managing and minimizing thermal effects in laser processing. It explains core concepts such as the Heat Affected Zone (HAZ), thermal relaxation time, and absorption rates. By identifying heat sources across three levels—source-level (wavelength mismatch), process-level (pulse accumulation), and path-level (scanning patterns)—it offers systematic solutions including optimizing optical configurations, selecting "colder" light sources (e.g., UV or ultrashort pulse lasers), and adjusting process logic through multi-pass strategies and auxiliary gases. Detailed parameter tables for various materials and a troubleshooting guide are included to help engineers achieve high-precision results with minimal thermal damage. Read More »

This study investigate the critical influence of wire feeding angle on the stability of droplet transition and process consistency in wire-laser additive manufacturing (WLAM). By employing a comprehensive fluid dynamics model, researchers analyzed the evolution of liquid bridge morphology and molten pool behavior across a range of wire feeding angles (25° to 65°). The findings reveal that increasing the wire feeding angle triggers a transition from a stable state, dominated by surface tension (at 25° and 45°), to an unstable state governed by inertia and gravity (at 65°). This instability is primarily caused by a mismatch between the melting rate and the wire feeding rate due to weakened heat transfer at larger angles. The study provides a theoretical framework for optimizing process parameters to ensure high fatigue performance and forming quality in complex geometric components for aerospace and automotive industries. Read More »

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