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晶体的透光率可以定义为一个光子在穿透晶体的过程中未被晶体吸收的几率,并可用简便的格林函数(GF)运动方程法求解。针对二声子的光吸收问题,导得光子GF的解析式。可知晶体的吸收常数γ∝c2·ρ,c为晶体与光相互作用参数,ρ为非谐晶体的二声子态密度。对数透光率跟吸收常数成正比。The transmittance of a crystal can be expressed in terms of the photon's Green function (GF), solved by the equation of motion method for the GF and evaluated numerically. In the particular case of absorption of two phonons by an anharmonic crystal the formulae are derived for the, self energy of the photons and then for the transmittance of the crystal.
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