
458 Laser-based measurements for time and frequency domain applications
FIGURE 6.30 (SEE CO LOR INSERT)
First experimental scheme for the cavity-enhanced generation of high-order harmonics from
a phase-stabilized oscillator [627]. See the text for details.
Both the first two experiments [626, 627] showing the poss ibility of producing cavity-
enhanced high-order harmonics also successfully tested the pr e servation of the comb coher-
ence. This was done only up to the third har monic by performing a beat experiment between
the radiation produced by the gaseous medium in the cavity and that generated in a more
conventional low-order harmonic generation ...