Autocorrelation-subtracted Fourier transform holography method for large specimen imaging

Abstract

We developed a variation of Fourier transform holography (FTH) method to record larger objects than those tolerable in conventional FTH. This method eliminates the separation condition of FTH by removing the autocorrelation signal, thus allowing three-fold larger specimens than those previously used in FTH under the same illumination conditions. We experimentally demonstrated this FTH variation, using a table-top Ag X-ray laser at 13.9 nm, with a sample violating the separation constraint. The portion of the object image hidden behind its autocorrelation in the FTH image was recovered by subtracting an independently measured autocorrelation signal of the object