35-878 25 mm Dia. Hard Coated OD 4.0 10nm Bandpass Filter; t=3.5 mm 250nm

The 35-878 is a 25 mm diameter Bandpass Filter, specifically designed with a center wavelength of 250nm and a 10nm bandpass. This filter is sourced from the reputable vendor, Edmund Optics, and is available for purchase directly from their website. The catalog number for this item is 35-878.

The Bandpass Filter is a type of optical filter that allows only a specific range of wavelengths to pass through while blocking others. In this case, the 35-878 Bandpass Filter is designed to permit wavelengths around 250nm, making it ideal for applications that require precise wavelength selection.

The filter is constructed with a circular shape and a thickness of 3.5mm. It is made from UVFS Mal-1965 material, which is known for its excellent optical properties. The filter's geometry is defined by a 25mm diameter, providing a substantial area for light to pass through while maintaining a manageable size.

The 35-878 features hard coating on both the front and back surfaces. This coating enhances the filter's durability and resistance to wear and tear, ensuring a longer lifespan and maintaining its optical performance over time. The coating material used is Edm 35-871, which is a high-quality coating known for its reliability and performance.

The filter's physical data includes a cut-on wavelength of 245nm and a cut-off wavelength of 255nm. The cut-on wavelength is the shortest wavelength that can pass through the filter, while the cut-off wavelength is the longest wavelength that can pass through. This 10nm bandpass, defined by these two wavelengths, is where the filter allows maximum transmission.

In terms of shape, the 35-878 is designed as a Thin Lens, which is a type of lens with a very small focal length compared to its diameter. This shape allows for efficient light transmission and focusing, making it suitable for a wide range of optical applications.