Combinaison cohérente de convertisseurs de fréquences optiques

Abstract : Laser emission wavelength is limited by the gain bandwidth of available laser media. Optical frequency converters rely on second order nonlinear processes to overcome this limitation, and give access to new wavelengths outside of the emission range of lasers.Besides, coherent beam combining with active phase control is an efficient technique to power scale laser sources. However, it requires fast phase modulators, some commercially available devices, but only at standard laser wavelengths.The objective of this thesis is to perform coherent combining of frequency converters, thanks to the phase-matching condition required for efficient nonlinear processes to take place.This relation allows for indirect phase control, where the converted-wave phase is tuned through direct phase control of the pump wave.A theoretical study has been carried out to confirm that indirect phase control was compatible with frequency-tagging coherent combining.Then, coherent combining through indirect phase control has been demonstrated experimentally in the simplest case of the second harmonic generators, where two of the three waves involved are degenerate.Finally, coherent combining has been experimentally performed in the non-degenerate case of mid-infrared difference frequency generators.In both experimental demonstrations, an excellent beam combination efficiency has been achieved.
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Alice Odier. Combinaison cohérente de convertisseurs de fréquences optiques. Optique [physics.optics]. Université Paris-Saclay, 2018. Français. ⟨NNT : 2018SACLX003⟩. ⟨tel-01888994⟩

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