Abstract
The length standard for atom gravimeters is defined by Raman laser wavelength, which, in turn, depends on the absolute laser frequency. Here we present a method to measure Raman laser frequency based on an atom gravimeter itself, which has an advantage of calibrating the length standard on-site. The calibration utilizes the D2 line of Rb87 atoms as a reference and takes advantage of the cold atom free fall as well as developed techniques of evaluating hyperfine-level shift within atom gravimeters. A calibration accuracy of 1 part in 1010 is achieved for the Raman laser frequency, which constrains the corresponding error below 1 μGal in our gravity measurement.
| Original language | English |
|---|---|
| Article number | 063626 |
| Journal | Physical Review A |
| Volume | 97 |
| Issue number | 6 |
| DOIs | |
| State | Published - Jun 29 2018 |
| Externally published | Yes |
Funding
The authors would like to thank Zehuang Lu and Jie Zhang for discussions regarding optical frequency measurement, and Shun Wang for revising the English in this version. We would also like to thank Shuqing Wu, Wei Zhuang, Yang Zhao, and Shaokai Wang of the National Institute of Metrology, China, for their help with optical comb measurement. This work is supported by the National Natural Science Foundation of China (Grants No. 11727809, No. 11625417, and No. 11574099).
| Funders | Funder number |
|---|---|
| National Natural Science Foundation of China | 11574099, 11727809, 11625417 |