11 research outputs found
A simple laser system for atom interferometry
We present here a simple laser system for a laser cooled atom interferometer,
where all functions (laser cooling, interferometry and detection) are realized
using only two extended cavity laser diodes, amplified by a common tapered
amplifier. One laser is locked by frequency modulation transfer spectroscopy,
the other being phase locked with an offset frequency determined by an
Field-Programmable Gate Array (FPGA) controlled Direct Digital Synthesizer
(DDS), which allows for efficient and versatile tuning of the laser frequency.
Raman lasers are obtained with a double pass acousto-optic modulator. We
demonstrate a gravimeter using this laser system, with performances close to
the state of the art
Hybridizing matter-wave and classical accelerometers
We demonstrate a hybrid accelerometer that benefits from the advantages of
both conventional and atomic sensors in terms of bandwidth (DC to 430 Hz) and
long term stability. First, the use of a real time correction of the atom
interferometer phase by the signal from the classical accelerometer enables to
run it at best performances without any isolation platform. Second, a
servo-lock of the DC component of the conventional sensor output signal by the
atomic one realizes a hybrid sensor. This method paves the way for applications
in geophysics and in inertial navigation as it overcomes the main limitation of
atomic accelerometers, namely the dead times between consecutive measurements
Cold-atom sources for the Matter-wave laser Interferometric Gravitation Antenna (MIGA)
International audienceAbstract The Matter-wave laser Interferometric Gravitation Antenna (MIGA) is an underground instrument using cold-atom interferometry to perform precision measurements of gravity gradients and strains. Following its installation at the low noise underground laboratory LSBB in the South-East of France, it will serve as a prototype for gravitational wave detectors with a horizontal baseline of 150 meters. Three spatially separated cold-atom interferometers will be driven by two common counter-propagating lasers to perform a measurement of the gravity gradient along this baseline. This article presents the cold-atom sources of MIGA, focusing on the design choices, the realization of the systems, the performances and the integration within the MIGA instrument
Cold-atom sources for the Matter-wave laser Interferometric Gravitation Antenna (MIGA)
The Matter-wave laser Interferometric Gravitation Antenna (MIGA) is an underground instrument using cold-atom interferometry to perform precision measurements of gravity gradients and strains. Following its installation at the low noise underground laboratory LSBB in the South-East of France, it will serve as a prototype for gravitational wave detectors with a horizontal baseline of 150 meters. Three spatially separated cold-atom interferometers will be driven by two common counter-propagating lasers to perform a measurement of the gravity gradient along this baseline. This article presents the cold-atom sources of MIGA, focusing on the design choices, the realization of the systems, the performances and the integration within the MIGA instrument