

13.5nm Half-Transparent Half-Reflective Beam Splitter
For applications requiring beam splitting of extreme ultraviolet (EUV) light, we provide Mo/Si coated beam splitters with mature processes, stable performance, and controllable reflectance and transmittance. Through flexible design of multilayer films and substrate membranes, we can precisely control transmittance and reflectance, and the membrane size can also be flexibly customized.

Introduction
Beijing Top Unistar Technology Co., Ltd. has accumulated nearly a decade of in-depth expertise in the X-ray and extreme ultraviolet (EUV) fields, along with a solid understanding of EUV optical technology trends and the demands of the Chinese market. Founded in the same year as Top Unistar, 2013, Germany's optiXfab specializes in commercializing the Fraunhofer Institute's patented Mo/Si multilayer technology and has produced nearly 20,000 high-performance EUV and X-ray mirrors for customers, most of whom are in the semiconductor and aerospace industries, including key optical components such as collector mirrors for LLP light sources and Schwarzschild objectives. With extensive industrialization experience and mature manufacturing processes, and based on long-term, in-depth technical exchanges and market analysis between the two parties, we have established a deep cooperation and decided to further extend this semiconductor-industry-verified advanced coating technology to scientific research applications. Together, we have launched high-performance Mo/Si multilayer mirrors for the 13.5 nm wavelength band, available in standard sizes including 1 inch and 1/2 inch. This product series can be widely applied in cutting-edge research areas such as HHG light sources, laser-driven plasma light sources, EUV imaging, EUV metrology, and EUV spectroscopy. In addition, related products are now stocked locally in China, enabling rapid response and delivery to provide more efficient and convenient support for users' research projects.
For applications requiring beam splitting of extreme ultraviolet light, we offer Mo/Si-coated beam splitters with mature processes, stable performance, and controllable reflectance and transmittance. Through flexible design of the multilayer and substrate film, we can precisely control transmittance and reflectance, and the film dimensions can also be customized flexibly.


Specifications
EUV performance
Wavelength: 13.5 nm
Reflectivity: R ~ 30 %
Transmittance: T ~ 20 %
Polarization: s-pol.
Bandwidth (FWHM): appr. 2 nm
Incident angle: 45 degrees
Substrate
Beamsplitter frame material: Si (100)
Dimensions: 12.5±0.25 mm x 12.5±0.25 mm
Thickness: 525±20 μm
Window size: 8±0.15 mm x 8±0.15 mm
Membrane material: Si3N4
Membrane thickness: ~ 100 nm
Coating
Multilayer design: Mo/Si
Measured reflectivity curve

Customization options
Window size (coated area)
Reflection bandwidth
Incidence angle
Optimization of s, p polarization reflectance and transmittance

About Top Unistar and optiX fab
optiX fab, Germany, is a spin-off company incubated by Fraunhofer IOF and founded in 2013 to commercialize Fraunhofer IOF's research and development activities in XUV/soft and hard X-ray optics, dedicated to the design, development, and manufacturing of various multilayer mirrors.optiXfab hasprovided customized multilayer and grazing-incidence optics for the XUV/soft and hard X-ray spectral ranges to high-end manufacturers, research institutes, universities, and synchrotron customers worldwide. Top Unistar, in partnership with optiXfab, offers all pre-sales consultation, sales, and after-sales services to customers in China. Additionally, as a leading service and solution provider in the EUV-X-ray field, Top Unistar has built up a certain inventory ofEUV and X-ray related equipment and core components, enabling rapid delivery to better serve our customers. We have also established a well-equippedX-ray open laboratory, equipped with multiple advanced X-ray light source systems, optical components, and detectors, capable of supporting diverse testing, preliminary research, and validation work including X-ray imaging, phase-contrast imaging, diffraction analysis, fluorescence detection, and characterization of X-ray source performance.
We are a team passionate about extreme ultraviolet (EUV) and X-ray technologies. If you have any questions and would like to communicate or discuss with us, do not hesitate to contact us directly.

