Tesina realitzada en col.laboració amb l'IFCO- Institut de Ciencies Fotoniques

The control and stability of the carrier-envelope phase of few-cycle pulses are crucial issues in attoscience. This project reports on a novel few-cycle mid-infrared source based on optical parametric chirped pulse ampli cation with 100 kHz repeti- tion rate at a wavelength of 3:2 m and a pulse duration of 67 fs. Due to the design of the source it is supposed to be intrinsically passively carrier-envelope phase stable. This assumption is proved experimentally with a new scheme to access the information about the carrier-envelope phase. Compared to the fð€€€2f scheme, which is widely used, this new scheme has the advantage of monitoring the carrier-envelope phase without using the main signal of the source.