Stroboscopic holography

Holography is the method of producing 3-dimensional image of an object by employing interference phenomenon. Idea of holography was first developed by Dennis Gabor in the year 1948. But since interference phenomenon badly required high quality coherent sources, this idea did not find any momentous applications.  After the invention of laser, holography attracted many researchers. The main limitation of holography is time averaging. To overcome this, stroboscopic holography technique can be used. Stroboscopic holography involves production of equal intensity fringes whose fringe width is proportional to amplitude. Measurement of relative phases of different points is also possible in this technique. The first step in stroboscopic holography is the recording of the hologram of a stationary object. Here exposure time is adjusted to get half of the final density. Now the object is vibrated and the light source chopped in synchronism. This illuminates the object and hologram stroboscopically. A synchronous motor can also be used to get synchronized stroboscopic illumination.