LBTEK observation white screens are available in two sizes: 75.0×75.0×2.8 mm and 150.0×150.0×2.8 mm. The front side features a matte finish, while the reverse side has an 8% micro-reflection. These matte surfaces provide uniform diffuse reflection, optimally displaying interference patterns and other images. The white polystyrene material of the observation screen facilitates the observation of bright images and light beams, with light even capable of penetrating the screen to reach its backside. Each observation screen includes a crosshair sticker for beam alignment. The bottom of the observation screen is equipped with an M4 threaded hole for mounting rods, making it easy to integrate the observation white screen into optomechanical setups. Please note: This observation screen must not be used as a beam block or any type of laser safety device. Its plastic construction results in a low damage threshold and slight transparency.