Sources lasers à l'état solides avec doublage de fréquence intracavité pour la spectroscopie de l'atome d'argent (Ag)

par Rodolphe Sarrouf

Thèse de doctorat en Laser, Métrologie, communications

Sous la direction de Patrick Juncar.

Soutenue en 2009

à Paris, CNAM .

mots clés

• Génération de second harmonique
• Lasers à solide -- Dissertations universitaires

Pas de résumé disponible.

Pas de résumé disponible.

Titre traduit

Solid-state laser sources with intra-cavity second harmonic generation for spectroscopy of silver atom

Résumé

Neutral silver atom has a thin natural atomic transition  ~ 0,8 Hz (4d10 5s 2S1/2  4d9 5s2 2D5/2) which can be probe by two photon at 661,325 nm. Realizing an optical frequency standard based on silver atom needs a preliminary piece of work of building two red single-modes solid state laser sources: a first one at 656,324 nm is required to generate U. V. Beam for cooling and trapping silver atom. A second red source at 661,325 nm must be set up for probing the two-photon clock transition. The work presented in these Ph. D thesis concern the way adopted to run those two red laser sources in respect to the specifications imposed by their using in terms of power, single-mode characteristics, time stability and M². Designing those red sources consists in intra-cavity frequency doubling of cw single-mode infrared bow-tie ring cavities at 1,3 µm based on Nd:YLF. Then, this Ph. D thesis first details work’s steps for carrying out cavities at 1312,648 nm and 1322,651 nm. In a second time, this Ph. D thesis reports measures on single-pass frequency doubling at 1,3 µm for testing several non-linear crystals (LBO, BiBO and ppKTP). Recorded results from single-pass tests lead to full characterization of second harmonic generation capability at 1,3 µm of such crystals and allow forecasting dynamic behavior of red sources building within them. The last part of this Ph. D thesis displays results recorded about red sources: Red source intended for probing the clock transition is tunable over a 2,15 nm range with 530 mW output red power at 661,325 nm. Red source for cooling silver atom is tunable over a 1,75 nm range with a single-frequency red power of 420 mW at 656,324 nm.