Charles Bourassin-Bouchet

Simultaneous spatial characterization of two independent sources of high harmonic radiation

We present the simultaneous spatial characterization of two independent sources of high harmonic radiation from a series of interferograms. Our technique transfers the necessity of replicating and shearing the test beam to a second, independent beam that may be easier to manipulate, and thus opens the possibility to characterize complex light sources. We demonstrate our technique by reconstructing the wavefronts of two high harmonic beams and use this information to study the spatial properties of different quantum paths.

Mutual interferometric characterization of a pair of independent electric fields

We demonstrate a novel interferometric characterization scheme that allows the complete reconstruction of two interfering electric fields. The phase profiles of both beams, and their relative phase, can be retrieved simultaneously as a function of any degree of freedom in which it is possible to shear one of the beams. The method has applications in wavefront sensing or ultrashort-pulse measurement, especially also in the domain of extreme light sources where it is difficult to generate a reference field or to replicate the beam in order to perform a self-referencing measurement. We demonstrate the technique experimentally by measuring simultaneously two ultrashort pulses in a single laser shot.

Three-material Multilayers for Dual-band and Broadband Extreme UV mirrors

We will present recent advances in the design and deposition of EUV multilayer mirrors. Efficient control of the spectral shape has been achieved by using three material structures. Applications to dual-band and broadband mirrors will be discussed.

Compression of attosecond pulses with multilayer mirrors

We present the design, fabrication and characterization of non-periodic multilayer mirrors for the compression of attosecond pulses in the XUV domain. We demonstrate that time domain optimization allows pulse compression down to sub-50 as duration.