Optical acquisition systems for direct-to-digital holography are disclosed. The system includes an illumination lens for focusing a reference beam and a beam splitter optically coupled to the illumination lens by the reference beam. A reference mirror is located at a waist of the reference beam and operates to eliminate a reference objective.
 The U.S. Government has a paid-up license in this invention and the right in certain circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of Contract No. DE-AC050R22725 for the U.S. Department of Energy.