In Fourier and Fresnel holography diffuse illumination is used to smooth the power spectrum of the object wave. A speckle pattern will then disturb the diffraction pattern. We present methods to calculate appropriate diffusers in digital holography that do not introduce speckle. The considerations include deterministic object-independent as well as iteratively calculated object-dependent diffusers. Object-independent diffusers are suited for initial phases to avoid stagnation of the iterative procedure.
© 1991 Optical Society of America
Original Manuscript: March 26, 1990
Manuscript Accepted: November 6, 1990
Published: March 1, 1991
Ralf Bräuer, Frank Wyrowski, and Olof Bryngdahl, "Diffusers in digital holography," J. Opt. Soc. Am. A 8, 572-578 (1991)