Efficient Optical Phase Conjugation in Methyl-Orange-Doped Polyvinyl Alcohol Film

摘要: An efficient optical phase conjugate (PC) wave in methyl-orange (MO)-doped polyvinyl alcohol (PVA) films by degenerate four-wave mixing (DFWM) is reported. As the wavelength concerned was far from absorption center of MO dye, a PC generated more efficiently. For configuration mutually orthogonal-polarized pump and probe waves reflectivity reached 30% at 531 nm an intensity 1 W/cm2 cw krypton-ion laser, using film with absorbance (=the product small-intensity coefficient thickness) 2.1 nm. It found that photoinduced birefringence resulting trans-cis isomerization, i.e., real part nonlinear susceptibility χ2112, mainly contributed to generation