The saturable absorber Cr,Ca∶YAG based on the undoped YAG was successfully grown by liquid phase epitaxy. The results from the absorption spectra analysis of the Cr,Ca∶YAG show that the main features in visible and near infrared range are the same as these by the Czochralski. Nevertheless, there is a weak absorption band centered around λ≈750 nm, which is first observed in the YAG lattice field. This weak band is interpreted as the arising from tetrahedrally coordinated Cr 5+ , and proposed to assign to the electric dipole allowed 2B 2( 2E)→ 2B 1( 2T 2) transition.