Doctoral contract on the study of ion-light interaction for an ultra-stable laser frequency stabilised on rare-earth ions (M/F)

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Doctoral contract on the study of ion-light interaction for an ultra-stable laser frequency stabilised on rare-earth ions (M/F) Sintesi in italiano (traduzione automatica): L'organizzazione internazionale offre un contratto di dottorato per lo studio dell'interazione ione-luce, finalizzato alla stabilizzazione della frequenza di un laser ultra-stabile su ioni di terre rare. La posizione è basata in un ente di ricerca e si concentra sull'analisi delle interazioni tra ioni e luce per migliorare la stabilità della frequenza laser. Le mansioni principali includono la ricerca teorica e sperimentale, l'analisi dei dati e la pubblicazione dei risultati. È richiesta una laurea in fisica o un campo correlato, con competenze in metrologia e ottica. Il candidato ideale avrà una forte motivazione per la ricerca scientifica e capacità di lavorare in un ambiente di ricerca collaborativo. Frequency locking generally requires the use of a laser beam at the frequency close to the centre of each narrow spectral hole for measurement and retroaction. Even if the sub-Hz laser line is much narrower than the kHz spectral holes, off-resonant photons, present with decreasing probability at increasing detuning, can still pump ions in neighbouring frequencies away over time, broadening the spectral holes and reducing our capacity of frequency discrimination. Since the inhomogeneous absorption profile is broad (~2 GHz for 0.1% doping concentration), a natural solution is to use the SHs for a limited duration and then shift to a new frequency tens of MHz away (this value being determined by the detection architecture) to lock again. However, due to the presence of the hyperfine structures, separated by tens to hundreds of MHz and mixed up in the inhomogeneous profile, features like 'side holes' (the same absence of population seen at a different frequency by addressing a different excited state) and 'anti holes' (over population in a different ground state) will distort the spectroscopic landscape, generally biasing the frequency discrimination. In addition, when the entire inhomogeneous absorption profile becomes 'used up', efficient spectral hole erasure will be necessary in order to refresh the spectroscopic landscape before imprinting new spectral holes for locking. We propose to carry out the following investigations of ion-light interaction in order to extend the duration of effective frequency stabilizationWe propose to carry out the following investigations of ion-light interaction in order to extend the duration of effective frequency stabilization. We propose to investigate ion-light interaction over tens to thousands of seconds, for an ultra-stable laser locked on solid-state frequency references at dilution temperatures. The goal is to reach maintain 1E-17 stability at long term for frequency metrology applications. Annuncio in inglese. Fonte: Euraxess (Commissione europea).