Optical simulation of an ultra-sensitive thermometer based on atom interferometry

In this letter, we apply an optical setup to simulate the coherent evolution of an atomic wavepacket under the action of a standing -wave optical pulse sequence. Predicted population oscillations in [J. Opt. Soc. Am. B 39, 3012 (2022)] have been observed, and the beam divergence angle, which corresponds to the atomic momentum width, has been obtained by fitting the data. Consequently, we confirm the viability of employing standing -wave optical pulse sequences for measuring the ultra -narrow momentum distribution of atoms. In addition, we introduce a fitting method suitable for data obtained under non -ideal experimental conditions, which serves as a reference for similar experiments in atomic ultra -low temperature measurements.