Stimulated Brillouin Scatterings

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... 

H. Atmanspacher, H. Scheingraber, V.M. Baev, Stimulated Brillouin scattering and dynamical instabilities in a multimode laser. Phys. Rev. A 35, 142 (1987)... 

Stimulated Brillouin scattering Stimulated Rayleigh scattering... 

FIGURE 26 (a) Schematic diagram of a typical configuration used for stimulated Brillouin scattering, (b) The /c-vector diagram for stimulated Brillouin scattering. 

The working principle of BOTDA is based on the Stimulated Brillouin Scattering (SBS) elFect, which is depicted in Figure 1. The Brillouin frequency shift has a linear relationship with strain and temperature applied on a single-mode optical liber, which can be expressed by (Bernini et al. 2002)... 

Bernini, R., Minardo, A., Zeni, L. 2002. Reconstruction technique for stimulated Brillouin scattering distributed fiber-optic sensors. Optical Engineering 41(9) 186-194. 

Stimulated Brillouin scattering (SBS) occurs at the lowest threshold power levels of the various non-linear effects and can be observed at powers as low as several miUiwatts, depending on the transmitter source and fiber characteristics. SBS occurs when signal power reaches a level that results in the generation of acoustic waves in the optical waveguide medium, through a process caUed electrostriction. The actual process... 

Optical phase conjugation was first observed in connection with stimulated Brillouin scattering (SBS) [8.125] and then in four-wave mixing processes [8.126]. It is further discussed in [8.127-8.129]. 

Khoo, I. C., R. R. Michael, and P. Y. Yan. 1987. Simultaneous occurrence of phase conjugation and pulse compression in simulated scatterings in liquid crystal mesophases. IEEE J. Quantum Electron. QE23 1344 see also Roy, D. N. Ghosh, and D. V. G. L. N. Rao. 1986. Optical pulse narrowing by backward, transient stimulated Brillouin scattering. Appl. Phys. 59 332. 

There are, in fact, many distinctly different physical mechanisms that will alter the density p of a material, such as pressure p, entropy S, or temperature T. These parameters are in most cases strongly coupled to one another. Accordingly, there are quite a variety of stimulated Brillouin scatterings depending on the imderlying physical mechanisms. 

Because of the nonlinear couplings among A, A2, and p, solutions to Equations (11.128)-(11.130) are quite complicated. A good glimpse into stimulated Brillouin scattering may be obtained if we solve for the density wave ampUtude p in a perturbative maimer. 

This grating will mediate stimulated scattering between the ordinary and extraordinary wave components. In analogy to stimulated Brillouin scattering, the growth of the scattered wave component is dependent on the intensity of the incident laser, and... 

Earher observation of transient SOS effects was conducted in the spirit of stimulated Brillouin scattering and involved fairly high power pulsed ruby laser. However,... 

Piezoelectric and magnetostrictive transducers have been the conventional method of generating and detecting ultrasonic waves. However, it is also possible to generate sound by nonlinear electro-strictive coupling via the intense electromagnetic excitation of a laser beam, an effect known as stimulated Brillouin scattering. 

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