NE201B 2 in x 2 in Absorptive ND Filter; Optical Density 0.1

The NE201B is a Neutral Density (ND) Filter, measuring 2 inches by 2 inches, sourced from the renowned optical component vendor, Thorlabs. This filter is designed to reduce the intensity of incident light without altering its color composition, making it an essential tool for various optical applications.

The filter features a coating of NE01A on both the front and back surfaces, which provides an optical density of 0.1. This specific coating is engineered to absorb a fraction of the incident light, thereby reducing the overall intensity. The optical density of 0.1 corresponds to a transmission of approximately 90%, indicating that only 10% of the incident light is absorbed.

The NE201B filter is constructed from N-BK7 Schott, a high-quality optical glass known for its excellent transparency and low auto-fluorescence. The filter's geometry includes a width and height of 50.8 millimeters each, with a thickness of 0.6 millimeters. This thin lens shape ensures minimal distortion and maintains the integrity of the light path.

The filter's webpage link is provided as a resource for further information and availability. As of the time of data collection, the link indicates that the filter is in stock, ensuring prompt delivery upon order placement.