Potassium aluminium borate
（重定向自Potassium aluminum borate）
Potassium aluminium borate (K2Al2B2O7) is an ionic compound composed of potassium ions, aluminium ions, and borate ions. Its crystal form exhibits nonlinear optical properties. The ultraviolet beam at 266 nm can be obtained by fourth harmonic generation (FGH) of 1064 nm Nd:YAG laser radiation through a nonlinear crystal K2Al2B2O7 (KABO).