HIGH OPTICAL NONLINEARITIES IN ALUMINUM BORATE CRYSTALS. Douglas A. Keszler, Ki-Seog Chang, Department of Chemistry, Oregon State University, Corvallis, OR 97331- 4003

We have structurally characterized new aluminum borate crystals having optical second-order susceptibilities predicted to be near 2 pm/V. These nonlinearites are among the higher values for borate crystals, comparable to that of BaB₂O₄ (BBO, d₂₂ = 1.8 pm/V) and exceeding those of LiB₃O₅ (LBO, d₃₂ = 1.17 pm/V), and CsLiB₆O₁₀ (CLBO, d₃₆ = 1 pm/V). Structures, crystal chemistry, optical properties, and prospects for large-scale crystal growth will be discussed.