Considerations regarding voxel brightness in volumetric displays utilizing two-step excitation processes

By the examination of a simple three-level quantum system, the time-dependent rate-equation analysis of the two-step excitation of fluorescence is extended to include the effects of the intermediate state lifetime and of saturation pumping on the total number of fluorescent centers excited to the target state. Further, the results relevant to the implementation of such a process to a volumetric 3-D display device are emphasized, and the performance of a display medium is indicated with respect to brightness and data rate. Restrictions placed on the two-step system by the fact that they are no longer assumed to be pumped in isolation are discussed.