Real-time holography

Eason, R.W. (1999) Real-time holography. Institute of Physics 1999 Congress, Salford, United Kingdom. 11 - 14 Apr 1999.

Abstract

Optical Physics is a rich source of inverse problems Obvious examples include areas such as image deblurring, image reconstruction from interferograms, holographic reconstruction, specific areas of pattern recognition such as matched filtering, and the rather more recent imaging through turbid media The key to many of these techniques lies is the use of holographic optical processing. to correct aberrations which in most cases are unknown, and often dynamic Red-time holography is a technique which eliminates the conventional multi-step process of recording, developing and readout inherent in conventional holography Real-time materials which include crystals, glasses and polymers, all permit holographic recording and readout to occur simultaneously. A beam of light which contains specific image information can become scrambled on propagation through turbulence, a multi-mode optical fibre, a phase distorter or other aberrator. If this distorted image retraces its path however, and experiences the same aberrations, but with a wavefront that has been phase reversed, then all aberrations will he undone, and a perfect image can result This talk will introduce the ideas behind phase conjugation (real-time holography), and give numerous examples of techniques such as aberration correction, optical Fourier transform manipulation, pattern recognition, and correction of optical amplifier distortion in holographic resonators. In all cases, it will be the ideas and applications that are stressed, rather than the detailed mathematical framework that underlies the technique.

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Contributors

Author: R.W. Eason

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