The dynamic range, sensitivity and dark decay of holographic recording in LiNbO3 crystals doped with 0.2 atomic% Mn with different oxidation states have been measured. The sensitivity is 0.5 cm/J and found to be independent of the oxidation states, while the largest <i>M</i>/# obtained is 12/mm (extraordinary light polarization, light wavelength 458 nm). The dark decay time constants of non-fixed holograms stored in these LiNbO<sub>3</sub>:Mn crystals obey an Arrhenius-type dependence on the absolute temperature with an activation energy of about 1.0 eV, and the dark decay is several orders of magnitude slower than that of LiNbO<sub>3</sub>:Fe with comparable doping levels. In contrast to LiNbO<sub>3</sub>:Fe, the dominant dark decay mechanism in highly-doped LiNbO<sub>3</sub>:Mn crystals is due to proton compensation rather than electron tunneling.

© 2001 Optical Society of America

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