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Maintien du couplage optique entre une ECDL et une cavité de haute finesse : application à la mesure ultrasensible de biréfringence induite par effet Kerr
- Source :
- Autre [cond-mat.other]. Université Claude Bernard-Lyon I, 2009. Français. ⟨NNT : 2009LYO10114⟩
- Publication Year :
- 2009
- Publisher :
- HAL CCSD, 2009.
-
Abstract
- The context of the work is the ultra-sensitive measurement of phase anisotropy permits by well-used of very high finesse cavity. To stabilize the laser frequency at the exact resonance of one cavity mode, a servo control based on optical feedback is used.In the first part, the optical coupling between laser and cavity is described through the comportment of the frequency of the self-locked laser. A comparison between experience and theory has permitted to identify the error signals in order to keep enduringly the laser frequency at the exact resonance. The experimental realization of the servo control into a 3 000 finesse cavity had demonstrated the stabilization of the laser frequency during more than ten hours with a residual one second excursion of 375 Hz.In the second part, the previous development has been used with a very high finesse cavity (F=250 000) to measure static Kerr birefringence in gases. The originality of the set-up is the use of the residual high reflectivity mirrors birefringence, firstly as the source of the optical feedback and secondly as an optical bias to measure the weak gas birefringence. An experimental and theoretical study of the noise according to the value of the optical bias has permitted a photon noise limited measurement (laser intensity of few mW). A record sensitivity of the phase shift induced by Kerr effect has been demonstrated at 3.10-13 rad with 800 s integration time. The scheme has been used to measure, in weak electric field (
- Subjects :
- Rétroaction optique
Stabilisation de fréquence
High finesse optical cavity
Biréfringence des miroirs
Anisotropie de phase
Static Kerr birefringence
Biréfringence Kerr statique
Mesure de constantes de Kerr
Frequency stabilization
[PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other]
Kerr constant measurement
Mirrors birefringence
Phase anisotropy
Optical feedback
Cavité optique de haute finesse
Subjects
Details
- Language :
- French
- Database :
- OpenAIRE
- Journal :
- Autre [cond-mat.other]. Université Claude Bernard-Lyon I, 2009. Français. ⟨NNT : 2009LYO10114⟩
- Accession number :
- edsair.od......2592..2773273a4afc1dca51973170cc512958