Real-time visualization of dynamic holographic interferometric images using photorefractive crystals

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations


Holographic interferometry of vibrating specimens using two-wave mixing in photorefractive Bi12SiO20 (BSO) crystals is achieved in reaJ-time. Real-time acquisition (30 frames per second) of holographic interferograms from vibrating objects is performed using repetitive sequences of separate record and readout times synchronized with the ccd acquisition rate. In this two-wave mixing experiment, the reference beam is collinear with the optical imaging system (the object beam) and an external AC electric field is applied onto the BSO crystal. This configuration improves the diffraction efficiency and keeps the time response to a minimum, compared to configurations where the reference and object beam interfere with a large writing-beam angle, θ. The performance of the photorefractive holographic interferometer using onaxis reference beam (θ=0°) and off-axis reference beam (θ=30°) are compared. Example of real-time acquisition with good fringe contrast is demonstrated.

Original languageEnglish (US)
Pages (from-to)296-301
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - Jul 17 1996
EventLaser Interferometry VIII: Techniques and Analysis 1996 - Denver, United States
Duration: Aug 4 1996Aug 9 1996


  • Dynamic holography
  • Photorefractive material
  • Real-time imaging
  • Speckle

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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