84-073 25 mm Dia. Infrared (IR) Bandpass Filter; t=1 mm 4260nm

The 84-073 is a 25 mm diameter Infrared (IR) Bandpass Filter, with a thickness of 1 mm, manufactured by Edmund Optics. This filter is designed to transmit light in the infrared spectrum, specifically at a central wavelength (CWL) of 4260nm.

The filter is made from high-quality aluminum oxide (al2o3 mal-1972-n-o), ensuring durability and reliability. It features a circular base shape, with a diameter of 25 mm, making it suitable for a wide range of optical applications. The filter's thickness is 1 mm, which is thin enough to minimize optical aberrations while providing sufficient structural integrity.

The 84-073 filter is a bandpass filter, meaning it allows light within a specific wavelength range to pass through while blocking other wavelengths. In this case, the filter is designed to cut on at 4200nm and cut off at 4320nm, making it ideal for applications that require the precise transmission of infrared light.

The filter's coating is another notable feature. Both the front and back surfaces of the filter are coated with "edm 84-073", which is likely a proprietary coating developed by Edmund Optics to enhance the filter's performance and durability.

The filter's shape is described as a "Thin Lens", suggesting that it may have some lens-like properties, such as focusing or diverging light. However, this is not explicitly stated in the provided data, so further investigation would be needed to confirm this.