非线性光学晶体铌酸钾锂的二次谐波产生

研究铌酸钾锂晶体的近经这过光谱：利用铌酸钾锂晶体对８９０￣９６０ｎｍ的Ｔｉ：ｓａｐｐｈｉｒｅ近红外激光进行倍频，获得蓝得蓝绿光输出；研究了晶体的倍频特性，探讨了提高晶体倍频效率的方法。

Second Harmonic Generation of Nonlinear Optic Crystal Potassium Lithium Niobate

The infrared transmission spectrum of potassium lithium niobate crystal was studied. The result showed that the spectrum properties of the crystal grown from the melt with higher Li2O contents is better than those of the crystal grown from the melt with lower Li2O contents, the latter has an absorption peak at the wavelength of 480urn while the former has not, so when a laser beam pass across the crystal, the optical loss for the former is lower than that for the latter. The reasons for the result are related to the reduction of replace chance of Nb atom at Li atom site in potassium lithium niobate crystal grown from melt with higher I.i2O contents. The reduction of optical loss is very beneficial to the increasing of the second harmonic generation efficiency of the crystal. The second harmonic generation properties of potassium lithium niobate crystal were studied. It showed that the potassium lithium niobate crystal has no frequency-doubling performance unless it has necessary Li contents. The second harmonic generation properties will be improved as the Li contents in the crystal increases. The blue-green laser have been obtained by doubling quasi CW-Ti: sapphire near infrared laser in the wavelength range of 890- 960um using potassium lithium crystal grown from the melt with Li2O 26mol%, the results showed that the crystal sample has good frequency-doubling efficiency. The means of enhancing the second harmonic generation efficiency of potassium lithium niobate crystal were discussed. It is deduced that the second harmonic generation efficiency will be increased while the light loss of the potassium lithium niobate crystal reduces.