355nm laser beam expander is an optical component specifically designed for ultraviolet laser systems, primarily used to increase beam diameter while reducing divergence, thereby improving far-field focusing performance and processing precision.

Design Features

These beam expanders typically employ a Galilean optical design consisting of a diverging lens and a converging lens, with no internal focal point, effectively eliminating air breakdown risks and making them particularly suitable for high-power UV laser applications. The lenses are manufactured from UV-grade fused silica (UV-FS) with high-performance anti-reflection coatings (<0.25% reflectance at 355nm), achieving ≥98.5% transmission and excellent thermal stability. Select models feature diopter adjustment capability for fine-tuning beam collimation.

Product Specifications

Expansion ratios range from 1.5X to 10X, with maximum input beam diameters exceeding 10mm. For high-power applications, certain models offer laser damage thresholds up to 5 J/cm² (355nm, 10ns, 20Hz). Mounting interfaces are typically M30×1 (input) and M34×0.5 (output) standard threads, compatible with mainstream galvanometer scanning systems.

Typical Applications

355nm UV beam expanders are widely used in precision micromachining applications: PCB/FPC drilling and cutting, semiconductor wafer dicing, precision cutting of brittle materials such as glass and sapphire, UV laser marking, and research applications including interferometry and spectroscopy.

Additionally, variable magnification models offer continuous adjustment from 1-4X or 2-10X, providing significant flexibility for R&D and prototyping applications.