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Sources laser à 1,5 µm stabilisées en fréquence sur l'iode moléculaire

Abstract : This thesis describes the frequency stabilization of a 1.54 µm laser diode on an iodine hyperfine line at 514 nm, after a frequency tripling process.An important part of this work is dedicated to the development of the frequency tripling process of a 1.54 µm laser diode, using two periodically polled wave guided Lithium Niobate nonlinear crystals. A nonlinear conversion efficiency P3w/Pw > 36 % is obtained. This result is the best efficiency ever demonstrated for a CW frequency tripling process. 300 mW of harmonic power is generated at 514 nm from a fundamental optical power of 800 mW at 1.54 µm. The optical setup is fully fibered. The total power consumption of this frequency tripling process is 20 W only. Using a specific operation mode, this laser setup emits simultaneously three frequency-stabilized and intense radiations at 1.54 µm, 771 nm and 514 nm.Following this development, a very compact laser spectroscopy setup was built, based on a short sealed quartz cell, which contains the molecular iodine vapor. An optical power lower than 10 mW in the green is sufficient to carry out the iodine vapor interrogation, and to detect the hyperfine saturation transitions, which have a high quality factor around 514 nm (Q > 2x109).A frequency stability at the level of 4.5 x 10-14 τ-1/2 with a minimum value of 6 x 10-15 from 50 s to 100 s is demonstrated in this study. This frequency stability is the best result ever conferred to a laser diode at 1.54 µm, using in a simple way a Doppler-free iodine spectroscopy technique.This work has allowed to identify the major key components, in order to develop in the near future, a fully fibered and compact stabilized laser prototype occupying a total optical volume < 10 liters.Such a laser source could cover the needs of numerous space projects that require ultra-stable frequency optical links, inter-satellite or ground to space, for space geodesy (GRICE), Earth gravitational field measurement (GRACE-FO, NGGM), gravitational waves detection (LISA) , etc. …
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https://tel.archives-ouvertes.fr/tel-01809533
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Submitted on : Thursday, June 7, 2018 - 12:06:15 PM
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  • HAL Id : tel-01809533, version 2

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Charles Philippe. Sources laser à 1,5 µm stabilisées en fréquence sur l'iode moléculaire. Astrophysique [astro-ph]. Université Paris sciences et lettres, 2017. Français. ⟨NNT : 2017PSLEO007⟩. ⟨tel-01809533v2⟩

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