Thesis defense of Nour Daher

Thesis defense of Nour Daher, PhD student in the Lasers group at Laboratoire Charles Fabry, on 14 December 2021 at 2pm, on the theme: "Nonlinear Ultrafast Optics in Multipass Cells".

Abstract: This work deals with the study of nonlinear optics phenomena inside multipass cells. A Herriott cell is made of two curved mirrors that result in a stable periodic optical system, in which beams can propagate over many roundtrips. We investigate the propagation of ultrashort pulses in such a system, in which a nonlinear material (solid or gas) has been added. As a result, the optical nonlinearity is distributed over a large number of roundtrips and foci. A remarkable feature of these systems is the spatio-temporal homogeneity of the output pulses. In this general framework, we have more specifically studied experimentally three situations: high nonlinearity limits, spectral compression, and wavelength conversion using the Raman effect. Taken as a whole, these experiments establish the efficiency of multipass cells to study nonlinear optical phenomena.