| 摘要 |
In one embodiment of the presetn invention, the material is a non-linear optical compound with a beryllium oxide (BeO2) framework or superstructure. This new NLO materical as the general chemical formula (1) ( SIGMA i=1-3M alpha i<1>)( SIGMA j=1-3 M beta j<2>)BeO<2, >wherein M1 and M2 are mono- and di-valent metal ions respectively; wherein ( SIGMA i=1-3 alpha i)= X and ranges from 0 to 2, ( SIGMA j=1-3 beta j) = Y and ranges from 0 to 1, (hereinafter referred to as "MBEO" compounds). Another embodiment of the present invention satisfies the generally formula (2) ( SIGMA i=1-3M alpha i<1>) beta eO2, wherein M<1> is a mono-valent metal ion; and wherein ( SIGMA i=1-3 alpha i) = X and ranges from 0 ti 2; and yet antoher embodiment of the present invention satifies the general formula (3) ( SIGMA j=1-3 M beta j<2>)BeO2, wherein M<2> is a di-valent metal ion; and wherein ( SIGMA j=1-3 beta j) = Y and ranges from 0 to1. Mono- and di-valent metal ions, M<1> and M<2>, that are suitable from forming compounds satisfying the gernal formula are preferably independently selected form the group consisting of Groups IA and IIA, however other mono- and di-valent cations amy be used so long as thematerial has a non-centrosymmetric arrangemnt. The best results are achieved by independently selecting M<1> for mthe group consisting of magnesium, calcium, and strontium.. Examples of nonlinear optical materials satisfying the general formula include, but are not limited to , Na2BeO2, Li2BeO2, K2BeO2, and Cs2BeO2. |
