2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/42223The exclusive reaction $ γγ\to f \bar{f} γ$ is considered as the possible calibration process on the linear photon collider. We analyse the energy spectrum and total cross section dependence on the detector parameters at various initial beam helicities.7 pages, 7 figures, corrected typos, minor changesHigh Energy Physics - Phenomenologytext