BSW23 In Stock

The BSW23 by ThorLabs is a highly specialized fused silica plate designed to provide exceptional performance in a range of applications. This Ø1" IR fused silica plate features a beamsplitter coating on the front surface optimized for a 45° angle of incidence, providing outstanding efficiency and accuracy in the 0.9 - 2.6 µm wavelength range.

The BSW23 is also equipped with a dielectric coating that ensures long-term stability, making it an ideal choice for a wide range of demanding optical applications. But that's not all - this versatile component also boasts an antireflection (AR) coating on the back surface, which helps to reduce unwanted interference effects caused by reflections from the front and back surfaces of the optic.

Because of the BSW23’s advanced AR coating, only an average of less than 1.5% of the light incident at 45° will be reflected over the entire operating range of the coating. This is a significant improvement over an uncoated substrate, which would typically reflect around 4% of incident light. Furthermore, the back of the BSW23 features a 30 arcmin wedge, which ensures that any reflected light will diverge and reduce interference effects even further.

The BSW23 is fabricated from IR-grade fused silica to ensure the highest levels of performance and reliability. This material has a lower coefficient of thermal expansion than N-BK7 and high homogeneity, providing exceptional stability and durability even in demanding applications. And for added convenience, the edge of the BSW23 is engraved with the item number and an arrow pointing to the AR-coated wedged surface.