Polaritons in LiJOa
نویسنده
چکیده
Using small angles between the wave vectors of the incident and scattered photons it is possible to observe Raman scattering by phonons or polaritons with small wave vectors which are determined by the momentum conservation equation. The photon wave vector inside a crystal with the refractive index n is k = 2 Jin/A where X is the wave length in vacuum. In uniaxial crystals there are an ordinary and an extraordinary ray with refractive indices n0 and n, respectively. One can get two different phonon wave vectors at the same scattering angle using ordinary incident and extraordinary scattered photons or vice versa. Fig. 1 illustrates the
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