  The calibration QED process cross sections for experiments on planned
electron-photon and photon-photon colliders for detecting the small angles
scattered particles are calculated. These processes describe the creation of
two jets moving sufficiently close to the beam axis directions. The jets
containing two and three particles including charged leptons, photons and
pseudoscalar mesons are considered explicitly. Considering the pair production
subprocesses we take into account both bremsstrahlung and double photon
mechanisms. The obtained results are suitable for further numerical
calculations.
