Linearly polarized luminescence from linear defects in natural and synthetic diamond

Abstract Photomicrographic studies of luminescence from cut and polished surfaces of natural and synthetic diamonds stimulated by electron bombardment (cathodo- luminescence) reveal sharply defined blue-emitting lines which, it is believed, correspond to dislocations. The blue emission is linearly polarized with electric vector always parallel to the line. The degree of polarization is greatest (90% or more) when the lines are straight and oriented in 〈110〉 directions and this orientation is frequently observed.