New 5,6-dihydro pyrimidin-2(1H)-thione compound containing imine moiety: synthesis, characterization, and nonlinear optical study

A novel chemical, 5,6-dihydro pyrimidin-2(1 H )-thione (compound A), is synthesized and characterized using several analytical techniques including FTIR, 1 H NMR, 13 CNMR, and mass spectroscopies. The compound’s structure has been determined. The nonlinear optical (NLO) properties of the compound are analyzed by subjecting it to visible continuous wave (cw), low power laser beams and observing the effects through the Z-scan and diffraction patterns. The initial approach yielded a nonlinear refractive index (NLRI) of 0.21 × 10 −7 cm 2 /W, while the following method yielded an NLRI of 3.925 × 10 −7 cm 2 /W. Each optical switching utilizes two laser beams: one beam controlled at a wavelength of 532 nm and another beam controlling at a wavelength of 473 nm.