Studies On Multiple-photon Optical Physics Properties Of Organic Dyes

All of the nonlinear optical properties are performed by nonlinear opticalmaterials. Under the action of optical/electric field, nonlinear optical material candisplay nonlinear susceptibility of second order or higher one. In the early times,the nonlinear optical materials were mostly abiocrystal, semiconductor and steamof atom/molecule, for example, double frequency crystal KDP. Now people paymore attention to nonlinear organic optical materials for their virtue. Organic dyeis a candidate for optical materials. Schafer defined the basic qualities of organicdyes to have conjugate double bonds.The intensive research on optical storage and optical modulation propertiesof azobenzene organic films play an important role in the information science.Photo-isomerization was analyzed especially for its application in optical storage.In this thesis, the photo-physical properties of azobenzene doped polymer as wellas azobenzene containing polymer were studied theoretically and experimentally.It mainly consists of photo-induced birefringence, photo-induced real-timephotographic gratings, the influence of additional polarized light onphoto-induced real-time photographic gratings, optical storage, upconversionluminescence and the relative theory. The research on optical physics phenomenaof azobenzene organic films mainly depends on the study of DR. Theexperiments include this content such as the photo-induced birefringence, theoptical control depending on photo-induced birefringence, the influence onadditional light and environmental temperature to the self-diffraction and theimage storage.The nonlinear optics and the advantageous properties of organic nonlinearoptical materials were shown in the introduction. The research progress innonlinear organic material and the thesis design were also summarized in chapter1. The optical storage technique was shown in chapter 2. It includes all kinds ofphenomena and theories, such as photo-induced anisotropy storage, degeneratefour waves mixing storage, photo-induced color-changed storage, photo-heat orphoto-electricity storage and so on. In this chapter, it also shows the structure ofazobenzene material, the method of how to make it and the reason of thepermanent optical storage. The photo-isomerization theory was systematically studied, which results inthe photo-induced birefringence and optical storage. A simple theoretical modelwas also performed in chapter 3. The results suggest that the permanent opticalstorage in azobenzene materials comes from the photo-orientation of molecules.The measure principle of photo-induced birefringence was shown in chapter 4.The azobenzene doped polymer films were used for photo-induced birefringenceas well as the azobenzene containing polymer films. We investigated thephoto-induced anisotropy with a probing He-Ne laser (633nm) and a linearlypolarized Ar+ laser (488nm). From measuring the depth of organic films, thethrough light intensity and the included angle, we can work out the photo-inducedbirefringence values through two formulas. Comparing the experimental result,we reason out the more advantageous properties of permanent storage in theazobenzene containing polymer films. In chapter 5, we theoretically analyzed the mechanism of photo-inducedreal-time photography and performed a new optical modulation method based onan additional linearly polarized light. We investigated the photo-inducedreal-time photography with two writing semiconductor laser beams (532nm) andan additional linear polarized Ar+ laser beam (488nm). By adjusting the includedangle between the additional polarized light and the writing light, one can...