Right-angle prism 05BR08

precisionBK7fused silica

Precision N-BK7 prisms offer Λ/4 surface flatness and several AR coatings for the most demanding applications, such as interferometry or holography in the visible and near IR range. •Precision N-BK7 Substrates •20-10 scratch-dig •λ/4 surface flatness •4 AR coatings to improve transmission •Excellent for beam bending and retroreflection Total Internal Reflection By means of total internal reflection (TIR), a right-angle prism may be used as a 90° reflector or as a 180° retroreflector. Except for reflection losses from the entry and exit faces, TIR exhibits 100% reflectivity over a very broad wavelength range. The reflecting surface should be coated with protected aluminum if the incidence angle exceeds that acceptable for TIR or if the environment does not allow the reflecting surface to be kept clean, as TIR requires. The hypotenuse can also be used as a first surface reflector. In this case, the overcoat of black paint should be removed with acetone. N-BK7 for VIS and NIR Applications N-BK7 is an excellent lens material for most visible and near infrared applications. It is the most common borosilicate crown optical glass, and it provides great performance at a good value. Its high homogeneity, low bubble and inclusion content, and straightforward manufacturability make it a good choice for transmissive optics. High Quality Precision Prism Surfaces Our precision prisms are polished to tight tolerances minimizing wavefront distortion. Tight surface quality tolerances minimize scatter and unwanted diffraction effects. These right angle prisms have a 20-10 scratch-dig surface quality, and a λ/4 surface flatness.