Laser processing is often constrained by the trade-off between spatial resolution and throughput imposed by conventional beam delivery concepts. This work presents a comparative study of three beam delivery concepts to overcome this limitation for semiconductor and electronics manufacturing.

First, a hybrid process for silicon carbide (SiC) wafer die separation is demonstrated in which high-power USP laser is scanned quickl using a polygon scanner to induce subsurface modification leading to automatic cleaving enabling kerfless die separation. In contrast to blade dicing or purely ablative laser dicing, the approach minimizes material loss while maintaining precise crack guidance.

Second, a cylindrical f-theta lens concept in combination with a focus shifter is introduced for high-speed generation of narrow lines across >200mm scan fields. By decoupling the focusing axes and combining cylindrical focusing with scanner-based beam steering at extended working distance, line widths in the few-micrometer range can be achieved at scan speeds that are typically only possible at smaller NA or reduced scan-field.

Third, transmission-mask projection is used to generate structures an order of magnitude smaller than the diffraction limited spot size for a scan field of the same size. Imaging a defined mask aperture through the optical system enables improved control over feature size and edge definition, thereby extending the accessible process window for high-resolution laser patterning.

The three approaches are put into context with standard processing. The results show that application-specific beam delivery design is a key enabler for high-throughput, lithography-free USP microstructuring at the single-digit-micrometer scale.