Laser-frequency stabilization using a lock-in amplifier

Weel, M.; Kumarakrishnan, A.
December 2002
Canadian Journal of Physics;Dec2002, Vol. 80 Issue 12, p1449
Academic Journal
We describe how a lock-in amplifier can be used in a feedback loop to lock the frequency of a laser to an atomic transition in [sup 85] Rb. A simple physical explanation is presented to describe the shape of the feedback signal generated by the "lock in" and the dependence of this signal on the phase of the reference signal. We also present a mathematical model of the feedback signal. Using the output of the lock in as feedback, we show that the laser frequency can be stabilized to a few MHz. The experiment is relatively simple to set up and could easily be adapted as an undergraduate laboratory experiment.PACS No.: 42.60MiNous montrons comment un amplificateur synchronisé peut servir dans une boucle de rétroaction pour verrouiller un laser sur une transition atomique dans le [sup 85] Rb. Nous expliquons de façon simple la forme du signal de rétroaction généré par la synchronisation et la dépendance de ce signal sur la phase du signal de référence. Nous présentons également un modèle mathématique pour le signal de rétroaction. Utilisant la sortie de l'amplificateur synchronisé comme rétroaction, nous montrons que la fréquence du laser peut être stabilisée à quelques MHz près. L'expérience est relativement simple et peut facilement être adaptée à un laboratoire de 1er cycle.[Traduit par la Rédaction]


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