Second harmonic generation temperature dependence

Second harmonic generation of (NH4)5Nb3OFi8,233 K5Nb3OF g, 233 Li4Nb04F, 226 Li4Ta04F, 229 other compounds, 225 principals, 224 Rb5Nb3OF18,233 temperature dependence, 226,229... 

By measuring the temperature dependence of second-harmonic generation (SHG) of the neodymium laser wavelength at 1.06 pm in sodium nitride for five different radiation geometries which correspond to the five nonvanishing components of the nonlinear susceptibility tensor, Vogt etal. 3 2) could determine these tensor components and the coherence length 1 = 4 2 re the... 

Al(lll)-(y3 X V3)R30°-K and Rb Adsorption of 1/3 ML K or Rb on Al(l 11) produces (. 3 x. 3)/ 30° phases with two distinctly different structures depending on the adsorption temperature, as described in Secs. 3.2 and 3.4. The fact that different structures are formed by adsorption at 100 K and 300 K for these two systems was immediately apparent from experimental LEED and CLS measurements before the structures had been determined. For the ( 3 x y 3)/ 30°—K structures, the conclusion of the LEED and CLS studies concerning the occupation of different sites in the two structures was later confirmed by a study [76] using Second Harmonic Generation (SHG) to monitor the change from on-top to substitu-... 

Assuming that arises from the third-order hyperpolarizability, elements of give information about the degree of orientational order. Measurements of electric-field-induced second-harmonic generation (EFISH) have been carried out [88] on 5CB, showing the expected temperature dependence. In liquid crystals, may originate from order or flexoelectric effects, or other mechanisms resulting in electric polarization. 

A group at Stanford studied second-order nonhnear susceptibility of the conduction band and valence band quantum well (QW) stractures extracted from the interference between second harmonic Adds of QWs and GaAs substrate as determined by the azimuthal dependence of the second harmonic power. This is the first demonstration of difference frequency generation of mid-lR in any QW. Groups at Stanford also studied vibrational dynamics in glass-forming liquids. These are the first vibrational photon echo experiments and first comprehensive temperature-dependent pump probe measurements on ar r condensed matter system. 

---