Stability of Information Readout by Self-Pumped Phase Conjugation in Barium Titanate,
LOWELL UNIV MA DEPT OF ELECTRICAL ENGINEERING
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For real-time optical image storage and processing, we have systematically studied self-pumped phase conjugation SPPC in barium titanate BaTio3 crystals from Sanders Associates Inc., Merrimack, NH in terms of the incident angle theta, the impact position 1 on the crystal surface, the distance L between tile imaging lens and the impact point on the crystal face the argon-ion laser power P p-wave with various wavelengths, and the ambient temperature T. We found that the stability of the temporal SPPC intensity I sub pct strongly depends on these geometrical parameters, theta, l, and L. The objective in this paper is to identify optimal conditions in order to stabilize and maximize the temporal evolution of the SPPC reflectivity Rt which is defined as the ratio of IPCt to the intensity I sub M retro-reflected by a mirror at the position of the crystal to the detector. We have defined the optimal or stable condition for the SPPC as Rmax - RtRmax, 0.1,where Rmax, is the maximum value of Rt recorded within 10 minutes to 1 hour and also the maximum value in terms of the above geometrical and physical parameters.