采用角分复用技术拓展低相干光源离轴全息术的探测面积  

Spatial Angular Multiplexing for Enlarging Detection Area of Off-Axis Digital Holography with Low-Coherence-Length Light Source

作　　者：马忠洪[1] 杨勇[1] 吴永丽[1] 邓丽军[1] 盖琦[2] 翟宏琛[1] 

机构地区：[1]南开大学现代光学研究所教育部光电信息技术科学重点实验室,天津300071 [2]天津理工大学中环信息学院,天津300380

出　　处：《光学学报》2013年第5期74-78,共5页Acta Optica Sinica

基　　金：国家自然科学基金重点项目(60838001);国家自然科学基金科学仪器基础研究项目(61227010);天津市应用基础及前沿技术研究计划(11JCYBJC01400);中央高校基本科研业务费专项资金资助课题

摘　　要：在采用超短脉冲光源或低相干连续光源的离轴数字全息术记录超快过程或获取光学断层信息的过程中,由于受光源相干长度限制,仅能在一个有限的区域内形成干涉条纹,则可探测到的物波面积会大大降低。提出了一种基于立体角分复用技术的低相干光源离轴数字全息系统的记录方法,利用不同立体角度的多个参考光与物光同时干涉,来克服在像面数字全息记录中由于光源的相干长度过短造成的对物波探测面积的限制。搭建了采用立体角分复用技术的脉冲数字像面全息实验系统,并获取了多个参考光与物光同时干涉形成的复合全息图。通过频谱变换和数字滤波,分别重构出由每路参考光与物光干涉所记录下的不同区域的物波波面,运用数字图像融合技术,获得了在整个探测面上所记录的物波波面。实验结果验证了该方法的有效性。In the off-axis digital holography for detecting the ultra-fast phenomenon or obtaining the optical tomography information, the interference fringes are formed in a limited region due to the low coherence length of the light source, resulting in a corresponding decrease of the detected area of the obiect wavefront. A new recording method based on spatial angular multiplexing for enlarging the detected area in the above situation is proposed, in which multiple interferences between the object and the reference waves are simultaneously carried out by the spatial angular multiplexing. An image plane pulsed digital holographic system with two references based on spatial angular multiplexing is set up in the experimental system. The full-field reconstruction image can be obtained by fusing the two separately reconstructed parts of the images into a complete one. The experimental results demonstrate the validity of this method.

关 键 词：全息 拓展探测面积 立体角分复用技术 低相干光源 

分 类 号：O436[机械工程—光学工程]