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Theses

Nonlinear Ultrafast Optics in Multipass Cells

Nour Daher 1 
1 Laboratoire Charles Fabry / Lasers
LCF - Laboratoire Charles Fabry
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 that the output pulses do not exhibit significant spatio-spectral couplings. In this general framework, we have more specifically studied experimentally three situations. A first experiment was done to study the high nonlinearity limit in a gas-filled multipass cell. We study the output pulses properties for peak power values approaching the critical power of the gas used. We show that the output beam is essentially spectrally homogeneous, notably using a full three-dimensional optical field (amplitude and phase) characterization technique. Second, we implement a spectral compression experiment in a multipass cell including fused silica plates. By using self-phase modulation in the solid medium, we turn negatively chirped femtosecond input pulses into Fourier transform-limited picosecond pulses. This allows energy scaling compared to previous implementations of the same functionality in optical fibers. Finally, we show that, by inserting a Raman-active solid material inside a multipass cell, it is possible to convert efficiently positively chirped femtosecond pulses towards larger wavelengths. The quasi-periodic propagation of pump pulses in the cell imparts a spatial filtering effect that results in high spatial quality output Stokes beams. Taken as a whole, these experiments contribute to establishing multipass cells as an efficient and useful platform to study and use nonlinear optical phenomena.
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Submitted on : Wednesday, March 16, 2022 - 11:29:09 AM
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  • HAL Id : tel-03610245, version 1

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Nour Daher. Nonlinear Ultrafast Optics in Multipass Cells. Optics [physics.optics]. Université Paris-Saclay, 2021. English. ⟨NNT : 2021UPASP127⟩. ⟨tel-03610245⟩

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