As the industrialization of waveguide based Augmented Reality devices is progressing, considerations around design based shaping of the waveguides as well as robustness move into focus. Therefore, automated approaches concerning the cutting of eyepieces made of high index glass is a high priority. A promising approach for scalable free form cutting with high strength and precision is the utilization of ultrashort pulsed lasers. However, the plurality of possible laser process parameters and the different material compositions of high index glasses present a challenging field of optimization opportunities with respect to strength of the glass. SCHOTT AG and 3D-Micromac AG optimized a separation process towards high and predictable bending strength and integrated it into a modular machine concept freely scalable from lab to mass production use.
MicroLEDs have a tremendous potential for future displays. However, there are several technical challenges to overcome prior to widespread deployment of MicroLEDs. One key hurdle is developing a process to release the dies from the sapphire growth wafer. Another is a process to transfer these to the display substrate with micron level precision and reliability. Laser processing offers several opportunities for MicroLED display production, such as Laser Lift-Off (LLO) to separate the finished MicroLEDs from the sapphire growth wafer and Laser Induced Forward Transfer (LIFT) to move the devices from a donor to the substrate. In this presentation, laser-based system solutions for the different manufacturing steps for MicroLEDs, will be presented. Integrated process control and monitoring is used to assure stable and reliable operation to ensure high throughput and low yield losses.
The fast-growing market for consumer-devices based on Augmented Reality (AR) technology requires optical waveguides. These components, which are used for image projection, are made of high-index glass or other transparent materials. Cutting eyeglasses out of the bare or preprocessed material has complex requirements for today’s available processes. For some years now, laser-cutting processes of transparent materials with ultrashort pulse (USP) lasers have been increasingly adopted in those industrial applications. The ability of a fully automated process flow is of critical importance, especially for AR products, which target the mass production market. Laser cutting tools combine good edge quality with fully automated process flows and free-form capability. This presentation covers the advantages of laser technology based on application examples for AR waveguides
Drilling holes with pulsed Nd:YAG lasers is well researched and state-of-the-art within a variety of industrial applications. Surgical needles in the medical field, turbine blades for the aviation industry, and gas filter for the automotive industry are just some examples that come to mind. Similar to other industrial developments over the last century this market asks for higher throughput, smaller diameter, higher aspect ratios, and of course within a minimum of tolerances. New laser sources and specially developed processes are entering the market to move the mere drilling to the next level of micro drilling. It is crucial to understand the application and the influence of the process parameters to develop a suitable, stable, and repeatable work process. Commonly used pulses within the microsecond-regime show a significant thermal side effect which is unacceptable if used e.g. in combustion nozzles. Reducing the thermal load by shortening the pulse length into the nanosecond-regime could be a compromise to bridge the gap between quality and production speed in high precision laser drilling. However, depending on the relation between pulse energy, pulse repetition rate, and "helical speed" a reduced, but existent, thermal effect is inevitable. The scope of this paper is to show the influences of the process parameters in helical drilling with a new developed nanosecond pulsed Nd:YAG laser at its fundamental wavelength of 1064 nm. A variation of drilling-optic principles in different materials are studied and the advantages as much as the disadvantages are discussed.
High speed contour weldings with feed rates in the range of meter per second are performed by single pulses of Nd:YAG lasers with real time pulse control.The pulse length may be up to 100ms leading to a possible contour length of more than 100mm. The properties of the weld pool was investigated with direct beam and a beam delivered via fiber on the metallic workpiece. Micrographic pictures show, that with fiber the profile (depth and shape) of the melted zone is quite constant along the contour, while for the direct beam the profile is strongly influenced by the change of thermal lensing of the laser rod during the pulse. Corrections are possible by applying temporal pulse forming. The effect of this highly dynamic welding strategy on the joining of similar and dissimilar metals, which show quality problems in conventional seam welding, is investigated. The results demonstrate an improvement in the metallurgy (e.g. cracks), mechanical and visual properties in most joining tasks.The advantages and limits of this micro-welding strategy will be discussed.
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