1
Multiple-exposure holography: addendum P. C. Mehta Instruments Research & Development Establishment Dehra Dun 248008, India. Received 30 October 1974. The gross features of Figs. 1 and 2 in the case of multi- ple-exposure holography 1 are similar to those in the case of hologram recording by time-dependent phase modulation of a reference or object beam. 2 This suggests that there is a one-to-one correspondence between the two recording methods as far as the modulation in contrast of fringes is concerned. In both cases, the object and reference beams are effectively made temporally partially coherent. For the elimination of flare light the paper by DeBitetto and Dalisa should be referred to. 3 References 1. P. C. Mehta, Appl. Opt. 13, 1279 (1974). 2. C. S. Vikram and H. Vardhan, Optica Acta 20, 313 (1973). 3. D. J. DeBitetto and A. L. Dalisa, Appl. Opt. 10, 2292 (1971). 2562 APPLIED OPTICS / Vol. 14, No. 11 / November 1975
