Tomographic imaging system using digital holographic technique based on integrating four buckets phase shifting interferometry

摘要

We present a tomographic imaging system that is applied a continuous phase shifting interferometry scheme to digital holographic microscopy (DHM). The proposed scheme achieves en-face tomographic image from digitally recorded original hologram by 2-D sensor array. Although images obtained at out-of-focus position, the application of integrating four bucket technique to digital hologram produces refocused en-face image with showing clear field of view. The proposed technique has advantages such as reduced phase errors and faster acquisition speed when it compared with conventional discrete phase stepping method. The performance of the system is demonstrated with presenting of the images on a scratched mirror surface and of an USAF resolution target. The reconstructed images are compared with conventional microscopic images, which reveal good aggrements. We believe that the proposed method enables tomographic imaging of biological samples with providing reduced noise level and improved imaging speed.