Calculation of Second-Order Nonlinear Optical Coefficients of KTiOPO4and KTiOAsO4

✍ Scribed by Dongfeng Xue; Siyuan Zhang

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 150 KB
• Volume: 142
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1998.8011

✦ Synopsis

The second-order nonlinear optical tensor coefficients of both KTiOPO 4 (KTP) and KTiOAsO 4 (KTA) are calculated from the chemical bond viewpoint. All constituent chemical bonds of both crystals are considered, and contributions of each type of bond to the total linearity and nonlinearity are determined. Calculated results agree satisfactorily with experimental data in both signs and numerical values. The calculation shows that though TiO 6 groups and P(1)O 4 or As(1)O 4 groups have relatively larger linear contributions, they can only produce an advantageous environment for KO x (x ‫؍‬ 8, 9) groups and P(2)O 4 or As(2)O 4 groups in nonlinear optical contributions. The origin of nonlinearity of KTP family crystals comes from the KO x (x ‫؍‬ 8, 9) and P(2)O 4 groups in their crystal structures. Furthermore, the difference in optical nonlinearities of KTP type crystals is analyzed, based on the detailed calculation of nonlinearities of both KTP and KTA.