High repetition rate laser frequency combs for astronomical spectrograph calibration

Diplôme Thèse High repetition rate laser frequency combs for astronomical spectrograph calibration eng 2019-12-13 author Obrzud Ewelina 785697 director Pepe Francesco Alfonso 124203 director Wildi François 24311 director Herr Tobias 10.13097/archive-ouverte/unige:131625 urn:nbn:ch:unige-1316257 Sc. 5428 Astronomical spectroscopy allows detection of exoplanets and their atmospheres, and gives insights into variability of physical constants. Astronomical spectrographs require suitable wavelength reference to provide precise and accurate measurements. Laser frequency combs have been recognised as an invaluable tool in spectrograph calibration. This thesis reports on the development and on-site test of two laser frequency combs operating in the near-infrared wavelength range. Both systems, the electro-optic frequency comb and Kerr frequency comb, are based on technologies providing directly high repetition rate (>10 GHz) operation and a calibration precision at the level of tens of cm/s. Furthermore, a novel technique for frequency comb generation in the visible wavelength range is demonstrated, which relies on triple-sum frequency generation in a nonlinear optical waveguide. This thesis contributes to the development of astronomical spectroscopy by offering perspectives for the improvement of existing and future extreme precision astronomical spectrographs. Laser frequency combs Microresonators Electro-optic modulation Ultra-short optical pulses Astronomical spectroscopy Spectrographs Spectrograph calibration Dewey 520 26 Département d'astronomie 12 false 10245656-9c26-409f-ac9b-17b0ecd748f5 Thesis Public thesis_final-Obruzud.pdf 39305033 application/pdf openAccess Faculté des sciences / Département d'astronomie

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High repetition rate laser frequency combs for astronomical spectrograph calibration				2019	834	231

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