We demonstrate a frequency-domain echo atom interferometer for measurements of gravitational acceleration $g$. The experiment relies on a sample of laser-cooled atoms at a temperature of approximately $10\mu \mathrm{K}$. Two composite running wave pulses with a relative detuning $\delta$, which are separated by a time $T$, are used to excite the sample and observe a grating echo at time $t=2T$. The echo is detected by coherently backscattering a traveling-wave readout pulse from the optical lattice that forms in the temporal vicinity of the echo time. The phase of the backscattered signal exhibits a linear dependence on $\delta$ for a fixed value of $T$ and the offset of this linear trend can be used to infer the value of $g$.

Close

PrevNext

View figure in article

• Atom optics
• Cold atoms & matter waves
• Cooling & trapping
• Metrology
• Atoms
• Trapped atoms