Transient and steady-state multi-wave nonlinear optical properties of liquid crystal film

Transient and steady-state multi-wave mixing experiments are carried out on the novel azo + c-tube liquid crystal sample. The shape of the diffracted multi-wave consists of rings under Ar⁺ (514.5 nm) laser pump light, and the nonlinear refractive index is n~0.8. Using different polarization states of the pump laser light field, different reorientation models of liquid crystal molecules are observed. On the other hand, a Nd:YAG(532 nm) pulsed laser is used, polarization holographic gratings are detected by a He-Ne (632.8 nm) laser beam. Different processes of liquid crystal molecular reorientation are also detected using the o-light beam and e-light beam of a He-Ne (632.8 nm)laser.