Disordered fluorite-type photochemical hole burning crystal containing SM.sup.2+ as active ions
AssigneeTosoh Corporation
InventorsNobuhiro Kodama, Kazuyuki Hirao, Shinichi Hara, Yuka Inoue
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Abstract
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 .alpha.-(MALn)F.sub.6-v X.sub.v where 0.ltoreq.v.ltoreq.1, 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.
Claims10
A disordered fluorite photochemical hole burning crystal which contains Sm.sup.2+ as active ions, and in which a composition except said Sm.sup.2+ is represented by a general formula
- .alpha.-(MALn)F.sub.6-v X.sub.v
- where 0.ltoreq.v.ltoreq.1, and M is an element selected from the group consisting of Ca, Sr and Ba, A is an element selected from the group consisting of Na, K, Rb and Cs, Ln is an element selected from the group consisting of Y, La, Gd and Ce, and X is an element selected from the group consisting of Cl, Br and I.
Dependencies are inferred from the claim text.