Third harmonic generation optical

Figure 5. Vibration diagrams depicting the effect of air on optical third harmonic generation from a thin solid. (See text for further discussion.)...

The unique properties of liquid crystals have also provided opportunity for study of novel nonlinear optical processes. An example involves the ability to modify the pitch of cholesteric liquid crystals. Because a pseudo-wave vector may be associated with the period of pitch, a number of interesting Umklapp type phasematching processes (processes in which wave vector conservation is relaxed to allow the vector addition to equal some combination of the material pseudo-wave vectors rather than zero) are possible in these pseudo-one-dimensional media. Shen and coworkers have investigated these employing optical third harmonic generation (5.) and four-wavemixing (6). 

Tsang, T. Y. F. 1995. Optical third-harmonic generation at interfaces. Phys. Rev. A 52 4116-25. 

Ward, J. R, and New, G. H. C. 1969. Optical third harmonic generation in gases by a focused laser beam. Phys. Rev. 185 57-72. 

Table 4. Third order NLO susceptibilities and molecular second hyperpolarizabilities of simple catenane and rotaxane molecules as determined by the optical third harmonic generation technique...

Laser lights with short wavelengths are important in optical data processing, and conjugated polymers are expected to be useful materials for their generation. Optical third-harmonic generation measurements have been performed for poly(phenylacetylenes) " The magnitudes of the third-order susceptibility were 7 x 10 esu for poly(phenylacetylene) and in the order of 10 -10" esu for its derivatives . ... 

Theory and experimental demonstration of optical third-harmonic generation in cholesteric liquid crystal [11]. 

The third order nonlinear optical properties of the functionalized polymers have been studied by optical third harmonic generation and by four wave mixing. The four wave mixing experiments performed at 1. 064 pm fundamental wavelength reveal index grating writing through trans-cls isomerization via a two photon process. This process can be used for all optical orientation of chromophores, as it will be discussed later. 

Xu, C. Kondo, T. Sakakura, H. Kumata, K. Takahashi, Y. Ito. R. Optical third harmonic generation in layered perovskite-type material (CioH2iNH3)2Pbl4. Solid State Cornmun. 1991, 79, 245. 

D.-H. Hwang, H.-K. Shim, J.-I. Lee, and K.-S. Lee, Optical third-harmonic generation of poly(2-trimeth-ylsilyl-l,4-phenylenevinylene) and poly(2,5-bis(tri-methylsilyl)-l,4-phenylenevinylene), Svnth. Met. 71 1721 (1995). 

T. Kaino, K. Kubodera, H. Kobayashi, T. Kurihara. S. Saito, T. Tsutsui, S. Tokito, and H. Murata. Optical third harmonic generation from poly(2,5-thienylene vinylene) thin Aims, Appl. Phys. Lett. 5i(2l) 2002 (1988). 

Kaino, T., Kobayashi, H., Kubodera, K., Kurihara, T., Saito, S., Tsutsui, T., and Tokito, S., Optical third-harmonic generation from poly(2,5-dimethoxy p-phenylenevinylene) thin film, Appl. Phys. Lett., 54, 1619, 1989. 

Transmitted optical third harmonic generation from the thin film deposited on a... 

KRAUSZ F., WINTER E. and LEISING G., (1989). "Optical Third Harmonic Generation in Polyacetylene", Phys. Rev. B39. 3701-3710. 

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