Polarized absorption and linear dichroism spectra of chromium and manganese doped gallogermanate (Ca_{3}Ga_{2}Ge_{4}O_{14}) crystals were measured and analyzed. Electronic transitions were identified and crystal field parameters have been determined. The value of linear dichroism obtained at the wavelength of 633 nm was compared with polarimetric measuring data for chromium doped Ca_{3}Ga_{2}Ge_{4}O_{14} crystals.
A new optical method for measuring the optical activity of crystals is developed. Temperature dependence of gyration component g_{11} of ferroelectric lead germanate is measured. The obtained results confirm that lead germanate may be considered as a gyroelectric crystal.
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