598 Selected Applications
(i.e., <20 fs, ≈1 mJ) down to a few fs (5.7 fs to 5.1 fs reported in Hauri
et al. [80, 81]). This mechanism of (soliton) compression is based on phase
modulation and dispersion, as explained in Chapter 8. Numerical simulations
relating to this compression mechanism have been published by Couairon [82].
13.3. SENSORS BASED ON FS LASERS
13.3.1. Description of the Operation
This section is dedicated to some applications of femtosecond lasers as sen-
sors. Rather than to use the beam radiated by the laser to perform measurements,
this type of metrology uses the laser as a differential interferometer. Two or more
pulses that are circulating in the laser resonator are made to interfere and a beat
note is measured. A form of amplitude ...