NENIR506B Dia. 0.5 in NIR Absorptive ND Filter; OD 0.6

The NENIR506B is a Neutral Density (ND) Filter, specifically designed for use in the Near-Infrared (NIR) spectrum with a wavelength of 1550 nm. This filter is manufactured by Thorlabs, a renowned vendor known for its high-quality optical components. The filter is circular in shape, with a diameter of 12.7 mm and a thickness of 1 mm, making it suitable for a wide range of optical applications.

The NENIR506B features a unique coating on both the front and back surfaces, denoted as 'tho nenir06b'. This coating is an absorptive type, designed to reduce the intensity of light without altering its color balance. The filter's optical density (OD) is 0.6, which corresponds to a transmission of approximately 32%. This makes it ideal for applications where light intensity needs to be controlled without significantly impacting the signal-to-noise ratio.

The filter has a 'Thin Lens' shape, which means it has a lens-like curvature. This shape can be beneficial in certain optical systems where flat filters may introduce unwanted aberrations. The catalog number for this filter is NENIR506B, and it can be found on Thorlabs' official website, where it is currently in stock.