Compact single-seed, module-based laser system on a transportable
high-precision atomic gravimeter
- URL: http://arxiv.org/abs/2208.04174v2
- Date: Fri, 21 Oct 2022 13:37:48 GMT
- Title: Compact single-seed, module-based laser system on a transportable
high-precision atomic gravimeter
- Authors: Fong En Oon and Rainer Dumke
- Abstract summary: A single-seed, module-based compact laser system is demonstrated on a transportable $87textRb$-based high-precision atomic gravimeter.
All the required laser frequencies for the atom interferometry are provided by free-space acousto-optic modulators (AOMs) and resonant electro-optic phase modulators (EOMs)
- Score: 0.0
- License: http://creativecommons.org/licenses/by-nc-sa/4.0/
- Abstract: A single-seed, module-based compact laser system is demonstrated on a
transportable $^{87}\text{Rb}$-based high-precision atomic gravimeter. All the
required laser frequencies for the atom interferometry are provided by
free-space acousto-optic modulators (AOMs) and resonant electro-optic phase
modulators (EOMs). The optical phase-locked loop between the two optical paths
derived from the same laser provides an easy frequency manipulation between two
laser frequencies separated by the hyperfine frequency of 6.835 GHz using an
AOM and an EOM, respectively. Our scheme avoids parasite Raman transitions
present in the direct EOM modulation scheme (modulating directly at the
frequency of the hyperfine splitting), which have detrimental effects on the
accuracy of the gravity measurements. The optical phase-locked loop also
provides a convenient way for vibration compensation through the Raman lasers'
phase offset. Furthermore, the modular design approach allows plug-and-play
nature on each individual optic module and also increases the mechanical
stability of the optical systems. We demonstrate high-precision gravity
measurements with 17.8 $\mu\text{Gal}$ stability over 250 seconds averaging
time and 2.5 $\mu\text{Gal}$ stability over 2 h averaging time.
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