AN Lan, ZHU Haifei, XU Yonggang, LIN Qianlan, LI Yongfang*
College of Physics and Information Technology, Shaanxi Normal University, Xi′an 710119, Shaanxi,China)
Abstract:
The physical process of the thirdharmonic generation (THG) produced by cascaded secondorder nonlinear optical effects is investigated in order to obtain the maximum energy conversion in nonlinear optical crystals. Based on the energy conservation condition, the functional form and characteristics of two coupling parametric ratios are obtained under the maximum THG conversion efficiency.When coupling parametric ratios has the form that t=tanh(z),t=arctan(4z)/1.55,t=(1-sech(1.8z)),the maximum energy output of third harmonic can be obtained.
KeyWords:
nonlinear cascaded process; thirdharmonic; energy conversion