Reminds me a bit of the "caustic design" papers in recent SIGGRAPHs in that they're both optimizing a lens's shape so that it produces a particular output lightfield -- although the hologram needs to incorporate diffraction and produce a much more constrained lightfield.

(Caustic video: https://www.youtube.com/watch?v=R00IvqcI9jU&feature=youtu.be... )