ND02A Dia. 25 mm ND Reflective Filter; SM1-Threaded Mount; Optical Density 0.2

The ND02A is a Neutral Density (ND) Reflective Filter, manufactured by Thorlabs, with a diameter of 25 mm and a thickness of 1 mm. This filter is designed for use with optical systems that require neutral density attenuation. The ND02A features an SM1-threaded mount, providing compatibility with various optical components and systems that utilize this thread standard.

The filter's primary function is to reduce the intensity of incident light without altering its color composition. This is achieved through the use of a specific coating on both the front and back surfaces, identified as 'tho nd02'. This coating provides an Optical Density (OD) of 0.2, which corresponds to a transmission of approximately 81%.

The filter's geometry is defined by its thin lens shape, and it is made from N-BK7 Schott, a high-quality borosilicate glass known for its excellent optical properties. The ND02A is designed to operate at a wavelength of 633 nm, making it suitable for a wide range of optical applications.

For users seeking detailed product information, Thorlabs provides a catalog number (ND02A) and a direct weblink to the product page, which is currently valid and indicates the product is in stock. This ensures users can quickly access additional information or make a purchase if desired.