Affiliation:
1. University of Chinese Academy of Sciences
2. Jiangsu University of Science and Technology
Abstract
We propose a method to characterize the ultra-narrow momentum
distribution of atomic gases by employing a standing-wave light-pulse
sequences beam splitter. The mechanism of beam splitting is analyzed
in detail, and the influence of a finite-width momentum distribution
on the population of each diffraction order is given. The temperature
of ultracold atomic gases can be calibrated by measuring the ratio of
population in different diffraction orders after double standing-wave
light pulses. We obtain analytical expressions for two typical cases,
and demonstrate phase space evolution in the whole process by using
the Wigner function. This method is valid for both classical atomic
gas and Bose–Einstein condensates, and it is suited for temperature
measurement on the space ultracold atomic physics platform, in which
the ultra-narrow momentum distribution of atomic gas is of the order
of 100 pK or even lower.
Funder
National Key Research and Development
Program of China
National Natural Science Foundation of
China
Subject
Atomic and Molecular Physics, and Optics,Statistical and Nonlinear Physics
Cited by
3 articles.
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