Femtosecond-pulse generation relies on net negative intracavity group-delay dispersion.Solid-state gain media and other optical components always introduce a certain amount of frequency-dependant positive dispersion in the cavity,which must be balanced as well.Brewster-angled prism pairs were popular choices in the last years.However,in prism-pair-controlled lasers,higher-order dispersion of the prism pair will be introduced,which increases the sensitivity and affects the size and repetition rate of femtosecond-pulse solid-state laser oscillators of the pulse width to the cavity and prism alignment.Gires-Tournois mirrors may not introduce above defects and can exhibit high reflectivity and precise control of the frequency-dependent group delay over a large bandwidth.They have played and will continue to play an important role in ultrashort pulse laser systems.Basic structure、dispersion performance and principle of design of Gires-Tournois mirrors are discussed.The optimized multilayer mirror used in a Cr∶LiSAF laser is reported.This mirror exhibit high reflectance(>99.9%) and smooth group delay dispersion(－35±8 fs2) from 750 nm to 900 nm.Most group delay dispersion of a 3 mm Cr∶LiSAF crystal can be compensated by four bounces.