High power laser bean can give rise to nonlinear change in the distribution of acoustic wave field and excite scattering Brillouin scattering (SBS) in water. At present, the uniform grating theory is used to analyze the spectral distribution of stimulated Brillouin scattering, which is inconsistent with the experiment. In this paper, three kinds of refractive index distribution model for reflection spectra were simulated by using the method of multilayer dielectric film, and the changes of the reflection spectra of different refractive index distribution models were analyzed.
In order to understand the stimulated Brillouin scattering (SBS) process in water, it is necessary to analysis theoretically the factors which to determine the SBS gain coefficient and threshold. The coupled wave equation is used to investigate the effects of temperature, salinity and attenuation coefficient on SBS gain coefficient and threshold. The results indicate that the higher the temperature and salinity, the greater the SBS gain. And the threshold is negatively correlated with the temperature. The effects of attenuation coefficient on threshold of steady-state SBS is greater than transient SBS.
The optical scattering characteristics of marine suspended particles not only directly affect the propagation characteristics of laser in seawater, but also serve as an important theoretical basis for optical monitoring of marine environment. In this paper, different experimental schemes and theoretical calculation methods were designed for the Au and ZnO nanoparticles dispersed in seawater with different sizes and shapes according to the angle distribution of scattering intensity. The results show that the angular distribution of scattering intensity of Au nanorod is different from the numerical results based on Mie scattering or Rayleigh scattering theory. In addition, at a specific wavelength, the angular distribution of scattering intensity of the seawater dispersion solution of ZnO nanospheres shows an obvious forward propagation characteristic, and when the particle diameter increases from 10nm to 200nm, the forward scattering intensity gradually dominates.
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