Conoscopic Holography
C. S. Narayanamurthy · 2022
The birefringent phenomena occuring inside a uniaxial crystal is responsible for the formation of the conoscopic figures. In conoscopic holography this birefringent effect of uniaxial crystal is used and the most advantageous feature of conoscopic incoherent holography is that the two interfering light beams have identical geometrical paths. Though conoscopic hologram has different approach, one can apply it for wavefront sensing and polarization based phase imaging for stress and strain measurements but due to developments in digital holography and for want of high quality birefringent crystals, very few conoscopic holographic imaging applications have been developed. The natural space invariance of the system permits both ordinary and extraordinary beams to have equal optical paths over the full image frame, and due to that the spatial coherence of the light source imposes no limitations on the sizes of the object and the hologram.