NDIR20B Dia. 25 mm Unmounted IR Reflective Neutral Density Filter; OD 2.0

The NDIR20B is a circular, unmounted Neutral Density Filter with a diameter of 25 mm and a thickness of 1 mm, sourced from the reputable vendor Thorlabs. This filter is designed for use in the infrared spectrum, with a specified wavelength of 5000 nm.

The NDIR20B filter boasts a sophisticated coating on both the front and back surfaces, known as the tho ndir20a coating. This coating is engineered to provide a high level of neutral density, with an Optical Density (OD) of 2.0. This means that the filter reduces the intensity of incident light by a factor of 100, making it an ideal choice for applications that require significant light attenuation.

The filter's geometry and shape are designed for easy integration into optical systems. It features a thin lens shape, which minimizes the potential for optical aberrations and ensures efficient light transmission. The unmounted design allows for flexibility in integration, whether it's into a custom optical setup or a pre-existing system.

For more detailed information, including availability and pricing, please refer to the vendor's website using the provided catalog number, NDIR20B.