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Accrochages de fréquences dans les lasers vectoriels à état solide : étude du verrouillage de modes passif et de la réinjection décalée en fréquence

Abstract : We explore synchronization dynamics of dual-polarization solid-state lasers. Such lasers are able to produce a stable beat frequency in a wide range from Hz up to THz. This work take advantage of it in order to study several frequency locking mecanisms in these lasers. First, we build a dual-polarization laser with a semiconductor saturable absorber miror (SESAM). It enable a pulsed operation of the laser where all longitudinal modes are phase-locked, and this on both laser eigenstates. We also demonstrate that polarization state of successive pulses forms sequences that we describes here. A particular phenomenon is observed in this laser: when the beat-frequency is chosen equal to half the free spectral range of the laser, then the two frequency combs associated with the two laser eigenstates synchronize themself. Second, we submit a two-frequency laser to a frequency-shifted feedback. Doing so, we are able to transfer the radiofrequency synthetizer stability on the laser beat-frequency. This result is obtained both in cw and Q-switched regimes. Finally, together with the frequency-shifted feedback, we use the relaxation oscillations of a class B laser to induce a regime where the laser beat-frequency is synchronized with the external reference, while their relative phase oscillates. Subsequently, particular intensity dynamics are observed at the output.
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https://tel.archives-ouvertes.fr/tel-00769111
Contributor : Jérémie Thévenin Connect in order to contact the contributor
Submitted on : Sunday, December 30, 2012 - 6:30:29 PM
Last modification on : Wednesday, January 13, 2021 - 9:40:33 AM
Long-term archiving on: : Sunday, December 18, 2016 - 11:00:00 AM

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  • HAL Id : tel-00769111, version 1

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Jérémie Thévenin. Accrochages de fréquences dans les lasers vectoriels à état solide : étude du verrouillage de modes passif et de la réinjection décalée en fréquence. Optique / photonique. Université Rennes 1, 2012. Français. ⟨NNT : ⟩. ⟨tel-00769111⟩

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