BE05-355 In Stock

The BE05-355 by ThorLabs is a high-power beam expander that is designed to deliver superior optical performance and seamless integration into optical systems. Made with fused silica and equipped with threaded apertures, the BE05-355 is an ideal solution for expanding or reducing the diameter of collimated beams by a factor of 5.

What sets the BE05-355 apart from other beam expanders on the market is its low-aberration, air-spaced design. This design is optimized to provide a wavefront error of less than λ/4, which minimizes the impact on the M2 value of the expanded beam. The BE05-355 is perfect for use with optics or instruments that have narrow input apertures, as it can be used to create a narrow, diffraction-limited waist.

The optics used in the BE05-355 beam expander are coated with a 355 nm V coating to minimize reflections at the air-to-glass interface. This V coating design provides a lower reflectance over a smaller range of operation when compared to a broadband AR coating. This means that the BE05-355 can be used in a wider range of applications, without compromising on optical performance. The BE05-355 also features a sliding lens design that allows for collimation adjustment without the beam walk-off effect that is inherent to lens adjustments. This design allows the user to adjust the divergence without disturbing any attached optics, ensuring that pointing stability is maintained.

To make the BE05-355 even more versatile, it comes with a fixed mechanical length and non-rotating ends. The housing is designed with a smooth mounting surface with the same Ø1.2" diameter as compatible Ø1" lens tubes, making it easy to integrate into any optical system. Additionally, the threaded input and output apertures of the beam expander allow for easy installation of additional lenses and filters along the optical axis. Finally, the BE05-355 is equipped with internal SM05 (0.535"-40) and external SM1 (1.035"-40) threads, making it compatible with a wide range of lens tubes and other compatible optical components. Overall, the BE05-355 is an excellent choice for anyone looking for a high-quality, reliable, and versatile beam expander for use in a wide range of applications.