Abstract
The second order nonlinear optical properties of sandwich thulium bisphthalocyanine (TmPc2) molecule Langmuir-Blodgett (LB) films were investigated using the second harmonic generation (SHG) method. The dependence of the second harmonic intensity on the incident angle of the fundamental beam was measured and the mechanisms of nonlinearity were discussed briefly. The experimental results indicated that the second harmonic signal intensity was very strong and its maximum was obtained at an incident angle of 45°. The second order nonlinear optical susceptibility χ (2) was about 1.152×10 - 8 esu and the hyperpolarizability β was about 1.905×10 - 30 esu. By measuring the polarization properties of the second harmonic signal for the LB film and comparing this with the theoretical analysis, we found that the origin of the second harmonic generation was attributed to the electric quadrupole mechanism for the TmPc2 molecule.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
