| 摘要 |
PURPOSE: To provide a nonlinear optical crystal strontium beryllatoborate (SBBO) of the entirely new type, assured of or improved in the advantages of BBO related to SHG. CONSTITUTION: This strontium beryllatoborate nonlinear optical crystal is strontium beryllatoborate which is a nonlinear optical crystal. The compsn. formula thereof is Sr2 Be2 B2 O7 and its space group is P-63 (C6 <6> ), its point group is C6 and its unit lattice is a=4.663(3)Å, c=15.332(7)Å, z=2. The volume of the unit lattice is v=283.3Å. The crystal belongs to crystals of having a negative optical axis, has hardness of about 7 in Mohs hardness, has a m.p. of 1400 deg.C, is free from deliquescent property in the atm. air and has improved mechanical properties.
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