85-893 25 mm Dia. Hard Coated OD 4.0 50nm Bandpass Filter; t=3.5 mm 1050nm

The 85-893 is a Bandpass Filter, specifically designed for use in optical systems that require a narrow bandwidth of light to pass through while blocking other wavelengths. This filter, sourced from Edmund Optics, boasts a center wavelength (CWL) of 1050nm, making it ideal for applications that necessitate precise filtering within this spectral range.

The filter is circular in shape, with a diameter of 25mm, providing a substantial surface area for light to interact with. It has a thickness of 3.5mm, which contributes to its robustness and durability. The 85-893 filter is hard coated, enhancing its resistance to wear and tear, a crucial factor for components that are frequently exposed to handling or harsh environments.

The physical data of the filter is equally impressive. It is cut on at 1025nm and cut off at 1075nm, ensuring a tight bandpass around the CWL. This precise control over the passband is crucial for many applications, including spectroscopy, fluorescence microscopy, and laser technology.

The filter's coating is another notable feature. Both the front and back surfaces are coated with EDM 85-881, a coating that likely enhances the filter's performance and longevity. The shape of the filter is thin lens, suggesting that it may have additional optical properties beyond simple bandpass filtering.