We present an experiment on the measurement of the spatial distribution of cold atoms in a ceramic cell.The atoms are first cooled by diffusing light produced by multiple scattering of laser light at the inner surface...We present an experiment on the measurement of the spatial distribution of cold atoms in a ceramic cell.The atoms are first cooled by diffusing light produced by multiple scattering of laser light at the inner surface of the cell.An inhomogeneous magnetic field is applied after the atoms are cooled by using a pair of anti-Helmholtz coils,and thus the shift of atomic magnetic sub-levels is position-dependent.We move the anti-Helmholtz coils point by point while keeping the probe laser beam resonant with the cold atoms at zero magnetic field.The number of cold atoms at different positions can be extracted by detecting the absorption to the probe beam.The density of the cold atoms in the cell is measured in two dimensions perpendicular and parallel to the tube connecting to the vacuum system,respectively.The results show that at the center of the cell,fewer atoms exist due to the leakage of diffuse light into the hole connecting to the vacuum pump.The method we developed is used to detect cold atoms in a region where imaging is impossible.展开更多
基金Projects(51575539, U1837207) supported by the National Natural Science Foundation of ChinaProject(2020RC2002)supported by the Science and Technology Innovation Program of Hunan Province,ChinaProject(2021JJ40774)supported by Natural Science Foundation of Hunan Province,China。
基金Supported by the National Natural Science Foundation of China under Grant Nos 11074262,10874193 and 11034008.
文摘We present an experiment on the measurement of the spatial distribution of cold atoms in a ceramic cell.The atoms are first cooled by diffusing light produced by multiple scattering of laser light at the inner surface of the cell.An inhomogeneous magnetic field is applied after the atoms are cooled by using a pair of anti-Helmholtz coils,and thus the shift of atomic magnetic sub-levels is position-dependent.We move the anti-Helmholtz coils point by point while keeping the probe laser beam resonant with the cold atoms at zero magnetic field.The number of cold atoms at different positions can be extracted by detecting the absorption to the probe beam.The density of the cold atoms in the cell is measured in two dimensions perpendicular and parallel to the tube connecting to the vacuum system,respectively.The results show that at the center of the cell,fewer atoms exist due to the leakage of diffuse light into the hole connecting to the vacuum pump.The method we developed is used to detect cold atoms in a region where imaging is impossible.
