摘要
Potassium lanthanum nitrate dihydrate [K<sub>2</sub>La（NO<sub>3</sub>）<sub>5</sub>·2H<sub>2</sub>O], abbreviated as KLN, is anew nonlinear optica1 crystal. It belongs to orthogonal crpstal system, mm2 point groupand can transmit light from 0.33 to 2.35μm. Its nonlinear coefficients are three timesas large as those of KDP. KLN is noncritically phase-matched at room temperature for1.06 and 0.95μm lasers. Its threshold power (λβ<sub>θ</sub>/d<sub>eff</sub><sup>2</sup> is less than that of KNbO<sub>3</sub> andLBO at proper wavelengths. KLN contains dihydrate and is deliquescent, but
