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Searching for pseudo-Nambu--Goldstone bosons (pNGBs) in weak-coupling domainsis crucial for understanding the dark components in the universe. We proposesearching for pNGBs coupled to two photons in the mass range from 0.1~eV to10~keV. This could provide opportunities to test string-theory-based pNGBsbeyond the GUT scale $M \sim 10^{16}$~GeV included in the weak couplingproportional to $M^{-1}$. We provide formulae that are applicable tophoton--photon scattering via a pNGB resonance exchange with a stimulationprocess in an asymmetric head-on photon--photon collider by mixing three laserpulses in laboratory experiments. We discuss the quantum electrodynamic effectson the pNGB exchange in the same mass--coupling domain as a background processfrom the standard model. We find that a large unexplored mass--coupling domainis accessible by combining existing laser facilities, including free-electronlasers.

Exploring pseudo-Nambu--Goldstone bosons by stimulated photon colliders in the mass range 0.1~eV to 10~keV