NE540A Dia. 0.5 in Absorptive ND Filter; SM05-Threaded Mount; Optical Density 4.0

The NE540A is a Neutral Density Filter from Thorlabs, designed with a circular shape and a diameter of 12.7 mm. This filter is made of n-bk7 schott material and has a thickness of 2.8 mm, making it suitable for various optical applications. The NE540A features a thin lens shape and is equipped with an SM05-threaded mount for easy integration into existing systems.

The filter's primary function is to reduce light intensity without altering the color composition of the light source. It achieves this through its tho ne40a coating on both the front and back surfaces, which provides an optical density of 4.0 at a wavelength of 633 nm. This specific optical density ensures a significant reduction in light intensity, making the NE540A ideal for high-intensity light sources or sensitive optical detectors.

Please note that the NE540A is currently in stock, according to the vendor's website. For more information, including pricing and availability, users are encouraged to visit the provided weblink.