Bibliography - School of Physics - University of Melbourne

52 CHAPTER 5. HOLOGRAPHY
Film
Cut Corner
Film Holder
Figure 5.1: Orientation of the film in the film holder.
5.5.1.2 Film exposure
To produce high-quality holograms, the intensity of the reference beam should be at least
three times and not more than ten times the intensity of the light reflected off the object
beam, as measured at the position of the film 4 . Glaring reflections from the object on the film
should therefore be avoided, but they may provide some nice contrast in certain situations.
All beams should be in the same plane for optimum hologram production. Avoid touching
ALL mirror surfaces, especially the spherical mirrors.
The resultant image will have the same appearance as the object as seen through a window
having the same size and position as the photographic film relative to the object in the original
configuration.
5.5.1.3 Developing
ALL FILM HANDLING AND PROCESSING
MUST BE DONE IN COMPLETE DARKNESS.
In a darkroom, develop the film in CWC2 Developer for 4 minutes, gently agitating the
film. Rinse the film in the running water bath for 2 minutes. Place the film in the bleach
for 3 minutes, again providing gentle agitation. Rinse again in the running water bath for 2
minutes. ONLY AFTER bleaching may the light be switched back on. Allow the film to dry
in the drying cabinet, typically for about 5 minutes, before viewing.
If you wish to make a phase hologram, you must bleach the film for about 50% more time
4 The maximum fringe contrast would occur for equal intensity but this would result in distortion.