Abstract

Measurements of the saturated transmission and the undepleted ground-state population density of both Cr⁴⁺:YAG crystals and dye films as saturable absorbers have been experimentally attempted to understand the additional unsaturated losses in a high Q state. The saturated transmission of a saturable absorber is less than its maximum at a high saturation fluence because of the undepleted ground-state population density. Higher saturated transmission and lower undepleted ground-state population density have been observed for Cr⁴⁺:YAG crystals than have been observed for dye films at high optical densities.

© 2001 Optical Society of America

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