NE513B-A Dia. 0.5 in AR-Coated Neutral Density Filter; 350-700nm; OD 1.3 AR 350-700nm

The NE513B-A is a Neutral Density Filter offered by Thorlabs, a leading vendor in the optical industry. This filter is designed with a circular base shape, featuring a diameter of 12.7 mm and a thickness of 2.5 mm, making it suitable for a wide range of optical applications.

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 neutral density material, which has the same absorption coefficient across the visible spectrum, resulting in a uniform attenuation of light. The NE513B-A offers an Optical Density (OD) of 1.3, which corresponds to a reduction in light intensity of approximately 20%.

The NE513B-A is coated on both the front and back surfaces with AR coatings optimized for the 350-700 nm range. These coatings are designed to minimize reflection and scatter, thereby improving transmission and reducing unwanted artifacts. The coating type is specified as "tho ne13b-a" for both the front and back surfaces, indicating a consistent coating type across the entire filter.

The filter's shape is classified as a Thin Lens, suggesting that it may have some light-bending properties. However, this is not explicitly stated in the provided data, so further investigation or consultation with the vendor may be required to confirm this.

The NE513B-A is currently in stock and can be purchased directly from Thorlabs through the provided weblink. The link has been verified and is valid at the time of writing.