- Smart Time-Domain Optical Memory For the 15 years SRI has been investigating the physics and technology needed to develop high-performance coherent time-domain optical memory (CTDOM) and optical processing systems based on the concept called the stimulated echo. Very high storage densities are possible, 1000 gigabits per cubic centimeter or more. Single-channel data rates could be more than 10 ...www-mpl.sri.com/projects/pyu5310.html