Energy transfer in two-wave mixing quasi-degenerated in photorefractive crystals

3rd International Meeting for Researchers in Materials and Plasma Technology; 1st Symposium on Nanoscience and Nanotechnology

物理学;材料科学

Barrera, B.^1 ; Hernández, N.A. Arias^1 ; Prado, M.L. Molina^1 ; Tebaldi, M.^2

Universidad de Pamplona, Pamplona, Colombia^1

Universidad Nacional de la Plata, La Plata, Argentina^2

关键词: Absorption co-efficient;    Concentration ratio;    Coupling coefficient;    Diffusion fields;    Donor impurities;    High frequency gratings;    Saturation fields;    Two-beam coupling;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/687/1/012085/pdf
DOI  :  10.1088/1742-6596/687/1/012085

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Wave equations describing the quasi-degenerated two-beam coupling in the photorefractive crystals for high frequency gratings have been solved. In the case of the quasi-degenerate two-beam coupling, equations depend upon the coupling coefficient, the response time of the medium, the input beams frequencies, the absorption coefficient and the input intensity ratio. The response time of the medium is function of the diffusion field, the drift field, the saturation field and the concentration ratio, i.e., the ratio between NAdensity of acceptor impurities and NDdensity of donor impurities. The effect of these parameters on the gain has been studied in details.