Second harmonic intensity, coherence length

Figure 2. Depiction of the length dependence of second harmonic intensity. The lower curve shows the effect of decreasing the coherence length to 30% of the upper curve.

The ratio a can be related to the measured ratio of the p-polarized second-harmonic intensities for s- and p- polarized fundamental lights, Pp/P,. Assuming that nx n2 and L the coherence length, the relation between the ratio a and Pp/P, is described as the following equation ... 

Figure 12. Dependence of the second harmonic intensity on the ration of the average particle size to the average coherence length after Kurtz (16). (Reprinted with permission from Williams, D. J. Angew. Chem. Int. Ed. Engl 1984, 23, 690. Copyright VCH Publishers.)...

Fig. 11. Variation of second-harmonic intensity as a function of interaction length represented for (A) a phase-matched system, (B) a periodically poled system for which the poling field, and therefore the nonlinearity, changes direction every coherence length, and (C) a non-phase-matched process for which the power flows back from the harmonic completely back to the fundamental during every other coherence length of interaction. (From Reference 6, p. 262. Reprinted with permission.)...

Figure 2 Schematic diagram of the time-resolved IR spectrometer. CLS, cavity length stabilizer SHG, second harmonic generator IS, intensity stabilizer BPS, beam pointing stabilizer CS, coherent seeder PR, polarization rotator.

Fevine and Bethea have estimated the third-order susceptibilities for solutions in terms of the coherence lengths and second-harmonic signal intensities using quartz as a reference [33, 63] ... 

I i Intensity of incident light, 1 sample path length, 1 c coherent length, n, refractive index If phase matching condition A k =0 does not hold, I decreases, i.e., 1 m depends on the incident angle 0. m = 2 second harmonic generation (SHG) m=3 third harmonic generation (THG)... 

FIGURE 5 Variation of the second harmonic (a) and fundamental (b) intensity with (L/L ep), where / dep is the second-harmonic depletion length, for plane waves at perfect phase matching. [Reproduced from Reintjes, J. (1985). Coherent ultraviolet and vacuum ultraviolet sources. In Laser Handbook, Vol. 5 (M. Bass and M. Stitch, eds.), North-Holland, Amsterdam.]... 

In experiments, there were measured the intensities of the second harmonic / j- and the coherence length of /, i in the liquid crystalline phases and the corresponding parameters l iS> hso for the isotropic phase. From these... 

To study the SHG peculiarities for the smectic A phase, there was investigated the temperature behavior of the coherence lengths L and Li in 8CB (Figure 3), as well as the intensities of the second harmonic / < and Ik. There exist simple relationships between the coherence lengths in the nematic (/, and isotropic (/, ) phases ... 

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