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Theses

Génération d'ondes TeraHertz par Différence de Fréquence

Abstract : THz-waves extend from the far InfraRed (15 μm – 20 THz) to radio waves (3000 μm – 0.1 THz). Current sources based on thermal (Mercury lamps…), electronics (Gunn diode...) or optics (laser, antennas…) technologies can’t cover this wide spectral range for applications in spectroscopy and imaging. An alternative is provided by parametric nonlinear optics, which leads to the generation of THz waves from Difference Frequency Generation (DFG) by injecting one or two lasers in a nonlinear crystal. To better cover the wide THz domain, it is necessary to determine nonlinear crystals with optical properties leading to the generation of such waves with high conversion efficiencies.This PhD thesis is devoted to the study of these properties for a panel of nonlinear crystals, along with experimental results of THz generation from DFG between two monochromatic lasers in the nanosecond and picosecond regimes, or between two Fourier components within a femtosecond laser. We selected twenty new crystals never studied before in the THz domain, along with the organic crystal of BNA. We measured their transmission spectra from visible to THz, and their nonlinear properties including phase-matching conditions and conversion efficiency.
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Submitted on : Monday, January 14, 2019 - 11:33:13 AM
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Cyril Bernerd. Génération d'ondes TeraHertz par Différence de Fréquence. Optique / photonique. Université Grenoble Alpes, 2018. Français. ⟨NNT : 2018GREAT061⟩. ⟨tel-01980201⟩

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