A two-frequency acousto-optic modulator driver to improve the beam pointing stability during intensity ramps

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dc.creatorFröhlich, B.
dc.creatorLahaye, T.
dc.creatorKaltenhäuser, B.
dc.creatorKübler, H.
dc.creatorMüller, S.
dc.creatorKoch, T.
dc.creatorFattori, M.
dc.creatorPfau, T.
dc.date2007-01-16
dc.date.accessioned2026-07-07T07:55:52Z
dc.date.available2026-07-07T07:55:52Z
dc.descriptionWe report on a scheme to improve the pointing stability of the first order beam diffracted by an acousto-optic modulator (AOM). Due to thermal effects inside the crystal, the angular position of the beam can change by as much as 1 mrad when the radio-frequency power in the AOM is reduced to decrease the first order beam intensity. This is done for example to perform forced evaporative cooling in ultracold atom experiments using far-off-resonant optical traps. We solve this problem by driving the AOM with two radio-frequencies $f_1$ and $f_2$. The power of $f_2$ is adjusted relative to the power of $f_1$ to keep the total power constant. Using this, the beam displacement is decreased by a factor of twenty. The method is simple to implement in existing experimental setups, without any modification of the optics.
dc.descriptionSubmitted to Review of Scientific Instruments, 4 pages
dc.identifierhttps://arxiv.org/abs/physics/0701183
dc.identifierhttp://arxiv.org/abs/physics/0701183
dc.identifierRev. Sci. Instrum. 78, 043101 (2007)
dc.identifierdoi:10.1063/1.2720725
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/127110
dc.subjectOptics
dc.subjectInstrumentation and Detectors
dc.titleA two-frequency acousto-optic modulator driver to improve the beam pointing stability during intensity ramps
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