NE04B-A Dia. 25 mm AR-Coated Neutral Density Filter; 350-700nm; OD 0.4 AR 350-700nm

The NE04B-A is a Neutral Density Filter with a diameter of 25 mm, manufactured by Thorlabs. This filter is designed for use within the wavelength range of 350-700nm, making it suitable for a wide range of optical applications. The filter has a thickness of 0.7mm, which is thin enough to minimize optical aberrations while providing sufficient durability.

The NE04B-A filter features Anti-Reflection (AR) coatings on both the front and back surfaces. These coatings are specifically designed for the wavelength range of 350-700nm, ensuring minimal loss of light due to reflection. The AR coatings also help to reduce surface scatter, thereby improving the overall image quality.

The filter is shaped as a Thin Lens, which is a type of optical component that focuses light without introducing significant aberrations. This shape is particularly useful in applications where a precise focus is required, such as in microscopy or beam shaping.

The NE04B-A filter is made from UVFS MAL-1965, a material known for its excellent optical properties and durability. This material is also resistant to most common chemicals, making it suitable for use in harsh environments.

The filter is currently in stock and available for purchase through the Thorlabs website. More information about this product, including pricing and availability, can be found at https://www.thorlabs.com/thorproduct.cfm?partnumber=NE04B-A.