体全息产生光学涡旋的实验研究  

Experimental Investigation of Optical Vortex Generated by Volume Holography

作　　者：李海莲[1] 杨德兴[1] 任小元[1] 赵建林[1] 

机构地区：[1]西北工业大学理学院光信息科学与技术研究所,陕西省光信息技术重点实验室,陕西西安710072

出　　处：《光学学报》2010年第2期503-507,共5页Acta Optica Sinica

摘　　要：利用全息法可产生复杂拓扑结构的光学涡旋且容易实现对涡旋态的控制,但通常情况下衍射效率较低。以掺铁铌酸锂晶体为存储介质,通过对光学涡旋的体全息存储与再现研究,在晶体几何厚度仅为0.6 mm的情况下获得了26.7%的衍射效率,且再现图像与记录前图像质量相当。根据实验参数,应用Kogelnik耦合波理论进行的计算表明,在同一种晶体和曝光参数情况下,当晶体的几何厚度达到1.23 mm时可获得100%的涡旋光衍射效率。Complicated optical vortices can be generated by holography and their topological structures could be controlled easily,but the obtained diffraction efficiencies are usually low. It was investigated that optical vortex was stored and reconstructed in LiNbO3：Fe crystal by volume holography. The results exhibit that diffraction efficiency of vortex beam was achieved at 26.7% in a crystal just with a thickness of 0.6 mm,and the quality of reconstructed vortex was almost identical to that of original one. Furthermore,by employing Kogelnik′s coupled-wave theory,the results of numerical computations according to the experimental parameters show that diffraction efficiency of vortex beam could attain to 100% as the thickness of crystal reached 1.23 mm with the same crystal and the same exposure parameters.

关 键 词：衍射 光学涡旋 体全息 衍射效率 掺铁铌酸锂晶体 

分 类 号：O438[机械工程—光学工程]