Disordered fluorite-type photochemical hole burning crystal containing SM. sup.2+ as active ions

摘要

A disordered fluorite-type photochemical hole burning crystal contains Sm.sup.2+ as active ions, and a composition except Sm.sup.2+ is represented by a general formula -(MALn)F.sub.6-v X.sub.v where 0. ltoreq.v1, and M is an element selected from Ca, Sr and Ba, A is an element selected from Na, K, Rb and Cs, Ln is an element selected from Y, La, Gd and Ce, and X is an element selected from Cl, Br and I. Stable hole burning occurs at the room temperature to create narrow holes. The crystal can be used as a superior optical recording material for a room temperature operation.