49-027 12.5 mm Dia. Traditional Coated OD 2.0 Longpass Filter; t=1.5mm 550nm

The 49-027 is a Longpass Filter, a type of optical filter that transmits wavelengths longer than a specified value, while blocking shorter wavelengths. This particular model has a diameter of 12.5 mm and a thickness of 1.5 mm, making it suitable for applications where space is a constraint.

The filter is manufactured by Edmund Optics, a leading supplier of optical components, and is identified by the catalog number 49-027. It is available for purchase directly from their website, where it is currently listed as in stock.

The 49-027 is designed to cut on at 550 nm, meaning it begins to transmit wavelengths at this point. It does not have a specified cut off point, indicating that it continues to transmit all longer wavelengths. This makes it ideal for applications where the detection of longer wavelengths is required, such as infrared (IR) spectroscopy or astronomy.

The filter features a traditional coating on both the front and back surfaces. This coating enhances the filter's performance by reducing reflections and increasing transmission. The coating is identified as 'edm 49-027' on both surfaces.

The filter's shape is described as a Thin Lens, indicating that it has been designed to focus light. This could be beneficial in applications where a concentrated beam of light is required, such as in microscopy or laser systems.