84-665 12.5 mm Dia. Traditional Coated OD 2.0 Longpass Filter; t=1.5mm 1250nm

The 84-665 is a Longpass Filter, a type of optical filter that passes longer wavelengths of light and blocks shorter wavelengths, from the renowned optical components vendor, Edmund Optics. This particular model boasts a 12.5 mm diameter and a thickness of 1.5 mm, making it suitable for a wide range of optical applications.

The filter is designed to cut on at 1250 nm, allowing light of this wavelength and longer to pass through, while blocking all wavelengths of light shorter than this. This characteristic makes it ideal for applications where the detection of longer wavelengths is crucial, such as infrared (IR) spectroscopy, night vision, and heat-seeking technology.

The 84-665 features a traditional coating on both the front and back surfaces, denoted as 'edm 84-665'. This coating enhances the filter's performance and durability, providing reliable and consistent optical performance over time.

The filter's geometry is shaped as a Thin Lens, a type of lens with a short focal length and a small diameter relative to its focal length. This shape allows for efficient light transmission and minimal distortion, making it an excellent choice for precision optical systems.

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