Stimulated thermal scattering

ISTS impulsive stimulated thermal scattering KGM kinetic gelation model... 

I. C. Khoo, Hong Li and Yu Liang, "Self-Starting Optical Phase Conjugation in Dyed Nematic Liquid Crystal with Stimulated Thermal Scattering Effect," Opt. Letters, 18i. p. 3 (1993). 

Batra, I. P., R. H. Enns, and D. Pohl. 1971. Stimulated thermal scattering of light. Phys. Status Solidi. 48 11. 

Khoo, I. C., H. Li, and Y. Liang. 1993. Self-starting optical phase conjugation in dyed nematic liquid crystals with a stimulated thermal-scattering effect. Opt. Lett. 18 1490. 

Stimulated Rayleigh scattering from localised thermal fluctuations in gases 258) and liquids 259) has been reported with measurements of the line shifts, thresholds and critical absorption coefficients. 

Stimulated effects in nonlinear optics, such as stimulated Brillouin and Raman scattering in liquids and gases and stimulated thermal Rayleigh scattering, have been reviewed by Rank 260a)... 

Up to now/ the dimer laser system has been described alone in terms of population inversion between suitable energy levels/ and for this description the condition S2 > A 2 is indeed the only necessary condition for cw laser oscillation/ as long as the thermal population density in the lower laser level remains negligibly low. However/ as this optically pumped laser system is a coherently excited three level system/ the coherent emission can also be described as stimulated Raman scattering/ which is resonantly enhanced by the common level 3 of the pump and laser transitions. This coupled two photon or Raman process does not require a population inversion between levels 3 and 2 and introduces qualitatively new aspects which appreciably influence and change the normal laser behaviour. For a detailed and deeper description of the coherently excited three level dimer... 

Shin JS, Park S, Kong HJ (2010) Compensation of the thermally induced depolarization in a double-pass Nd YAG rod amplifier with a stimulated Brillouin scattering phase conjugate mirror. Opt Common 283 2402-2405... 

The critical propagation problems which are being addressed at the various research centres are Stimulated Raman scattering by air molecules thermal blooming, due to laser heating of the air electrical breakdown of the air, which could generate plasmas that attenuate the beam atmospheric turbulence, which could perturb the focusing of the laser beam. 

While the intensity of anti-Stokes radiation is very small in spontaneous Raman scattering due to the low thermal population density in excited molecular levels (Sect. 3.1), this is not necessarily true in stimulated Raman scattering. Because of the strong incident pump wave, a large fraction of all interacting molecules is excited... 

Mack, M. E. 1969. Stimulated thermal light scattering in the picosecond regime. Phys. Rev. Lett 22 13. 

Herman, R. M., and M. A. Gray. 1967. Theoretical prediction of the stimulated thermal Rayleigh scattering in hquids. Phys. Rev. Lett. 19 824. 

Khoo, I. C., and Y. Liang. 2000. Stimulated orientational and thermal scatterings and selfstarting optical phase conjugation with nematic liquid crystals. Phys. Rev. E. 62 6722-6733. 

Brillouin scattering measures the velocity and attenuation of hypersonic thermal acoustic phonons. A theory of Brillouin scattering from polymer blends is presented and illustrated qualitatively by several examples. The study of blend compatibility is illustrated for the system PMMA-PVFS. The detection of inhomogeneous additives is shown for commercial PVC film and cellulose acetate, and simultaneous measurements on separated phases are presented for Mylar film. The main purpose of the paper is to stimulate further work in a potentially promising field. 

Analytical applications have been found for all parts of the electromagnetic spectrum ranging from microwaves through visible radiation to gamma (y) rays (Table 1). The emission and absorption of electromagnetic radiation are specific to atomic and molecular processes and provide the basis for sensitive and rapid methods of analysis. There are two general analytical approaches. In one, the sample is the source of the radiation in the other, there is an external source and the absorption or scattering of radiation by the sample is measured. Emission from the sample may be spontaneous, as in radioactive decay, or stimulated by thermal or other means, as in flame photometry and fluorimetry. Both approaches can be used to provide qualitative and quantitative information about the atoms present in, or the molecular structure of, the sample. 

Previous findings on the actual microemulsion are given in references (9 17) where the system s phase map vs.concentration in the temperature interval (-20°C + 80°C), viscosity measurements,dielectric analysis of liquid samples against both concentration and frequency, the thermally stimulated dielectric polarization release (TSD), electro-optical phenomena, light scattering, Raman spectroscopy and sound propagation investigations are reported. 

The linewidths of spontaneous and stimulated Raman lines depend on the linewidth of the pump laser. For narrow linewidths, however, the width of the stimulated Raman lines becomes smaller than that of the spontaneous lines, which are Doppler-broadened by the thermal motion of the scattering molecules. A Stokes photon hco, which is scattered into an angle 0 against the incident laser beam by a molecule moving with the velocity v, has a Doppler-shifted frequency... 

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