Potential new applications of laser causing deexcitation, like emission coefficient mapping, radiotherapy or 2WQC

While naively laser only excites target, it can also cause its deexcitation – as stimulated emission, backward ASE (amplified spontaneous emission), or in Rabi cycle cyclically causing excitation and deexcitation. STED microscopy is a popular application of laser causing deexcitation - I would like to propose and discuss a few more, based on its properties suggested by CPT symmetry. For example, while CT scanner makes 3D maps of absorption coefficient, CPT symmetry suggests how to analogously measure/map emission coefficients. Related medical applications could be causing deexcitation of autoluminescent molecules like NADH, e.g. to starve cancer tissue. Finally, the original motivation was more symmetric and powerful two-way quantum computers (2WQC), for example with photonic chip between coupled laser resonators.