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Two simultaneous holograms and several directions of observation are utilized to determine the components of displacement and strain in the disk. A reference strip is introduced to relate the fringe orders in the two holograms. A very good agreement is obtained between the holographic results and the elasticity theory solution. The obtained displacement field is estimated to be accurate to 8 x 10-6 cm, which is approximately one-eighth the wavelength of the laser light utilized to obtain thedoi:10.1364/ao.12.001951 pmid:20125637 fatcat:di3tnosuwzcurgaw4vj4gg3z5a