NE04A Dia. 25 mm Absorptive ND Filter; SM1-Threaded Mount; Optical Density 0.4

The NE04A is a Neutral Density (ND) Filter, offered by Thorlabs, with a diameter of 25 mm and a thickness of 0.7 mm. This filter is designed to reduce the intensity of incident light without altering its color composition, making it an essential tool in various optical applications.

The filter is made of n-BK7 Schott, a high-quality optical glass known for its excellent transmittance and low auto-fluorescence. This material ensures high-fidelity light transmission, making the NE04A suitable for applications that require precise light control.

The NE04A features a front and back coating of tho ne04a, which further enhances its performance. These coatings help to minimize surface reflections, thereby improving light transmission and reducing the risk of unwanted glare or ghosting.

The filter is SM1-threaded, allowing it to be easily integrated into existing optical systems that use SM1-compatible components. This threading also provides a secure and stable mount, ensuring the filter remains properly aligned during use.

With an optical density of 0.4, the NE04A reduces the intensity of incident light by a factor of 2.51. This makes it suitable for applications where moderate light reduction is required, such as in high-powered laser systems or in imaging applications where excessive light could lead to image saturation.

The NE04A is currently in stock and available for purchase through the Thorlabs website. For more information, please refer to the provided weblink.