NE2R30B Dia. 2 in Absorptive ND Filter; Optical Density 3.0

The NE2R30B is a Neutral Density (ND) Filter, designed and manufactured by Thorlabs, a renowned optical components vendor. This particular model boasts a circular shape, with a diameter of 2 inches (50.8 mm) and a thickness of 2.1 mm, making it compatible with a wide range of optical systems.

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 specialized coating, referred to as 'tho ne30a', which is applied to both the front and back surfaces of the filter. This coating is responsible for the filter's optical density of 3.0, which corresponds to a reduction factor of 1000x for the incident light.

The filter is made from N-BK7 Schott, a high-quality borosilicate glass known for its excellent optical properties. This material ensures high transmittance across a broad spectrum, making the NE2R30B suitable for a wide range of wavelengths. In this case, the specific wavelength mentioned is 633 nm.

The NE2R30B filter features a 'Thin Lens' shape, which implies a specific curvature that can influence the optical path of light. This shape can be beneficial in certain applications, such as beam shaping or focusing.

The filter's current status is 'in stock', and it is available for purchase through the vendor's website. The catalog number for this item is NE2R30B.