Beam Splitter

The diffractive beam splitter is a DOE, Diffractive Optical Elements, that splits laser light into multiple beams and realizes simultaneous focusing on multiple points by combining lenses. Various beam intensity patterns are formed by line or matrix distribution.

●Can be used in conjunction with a multi-mode laser as well as with a single-mode.

●Offers easy alignment, splitting characteristics do not depend on beam incidence position.

●Spot pitch is proportional to the focal length of focusing optics.

●Moving parallel to the scanning in-line beam spots parallel to their sequence can achieve deep penetration.

●Spot pitch adjustment is possible by positioning the Diffractive Beam Splitter after the focusing lens.

●Pitch adjustment of multi-point scribing is possible by rotating the Diffractive Beam Splitter.

●Materials

Depending on the laser wavelength, aspheric lens types use calcium fluoride (CaF₂) or zinc selenide (ZnSe), while DOE types use high-purity fused silica or zinc selenide. Sumitomo Electric has developed and operates its own reactor for zinc selenide materials, enabling the manufacture of components using domestically produced zinc selenide.

●Coating

Lenses and DOEs are coated with anti-reflection (AR) coating on both sides as standard.

Furthermore, Sumitomo Electric’s coating for zinc selenide does not use any ThF4 (thorium fluoride, a radioactive substance), which is commonly found in similar products from other companies, making it environmentally friendly and safe to handle.