We report on the development of highly dispersive mirrors for chirped-pulse oscillators (CPOs) and amplifiers (CPAs). Low-loss and alignment-insensitive all-dispersive-mirror compressors can take over the role of prisms and gratings in conventional CPA systems, with the added benefit of shorter pulse duration due to high-order dispersion control and absence of self-phase modulation. The evolution of dispersive dielectric multilayer mirror technology within the last 15 years now allows us to report a new generation of low-loss and alignment-insensitive high-dispersion mirrors (HDMs). In this proof-of-concept study, we demonstrate the usability of highly dispersive multilayer mirrors for high-energy femtosecond oscillators, namely for a chirped-pulse Ti:Sa oscillator and an Yb:YAG disk oscillator. In both cases, a group delay dispersion (GDD) in the order of 2×10⁴ fs² was introduced, accompanied with an overall transmission loss as low as about 2%. This unprecedented combination of high dispersion and low loss over a sizeable bandwidth with multilayer structures opens the prospects for femtosecond CPA systems equipped with compact, alignment-insensitive all-mirror compressors, which provide compensation of GDD and higherorder dispersion.