The Ramsey fringes with a linewidth of 45 Hz and a signal-to-noise ratio of 120 are demonstrated for a integrating sphere atom clock.The cycle time of the atom clock is reduced to 80 ms with the help of a pulsed cooli...The Ramsey fringes with a linewidth of 45 Hz and a signal-to-noise ratio of 120 are demonstrated for a integrating sphere atom clock.The cycle time of the atom clock is reduced to 80 ms with the help of a pulsed cooling method.This result indicates that the short-term stability of the clock is in the order of 10^(-12).展开更多
The Faraday rotation of weak linearly polarized probe light is observed as it passes through a sample of cold ^87Rb atoms prepared by diffused light in an integrating sphere. The rotation angle of the probe light-pola...The Faraday rotation of weak linearly polarized probe light is observed as it passes through a sample of cold ^87Rb atoms prepared by diffused light in an integrating sphere. The rotation angle of the probe light-polarization as functions of laser intensity, detuning and biased magnetic field is measured. A Ramsey fringe with a linewidth of 35 Hz and contrast up to 92% is demonstrated. This method has potential applications in improving the performance of atomic clocks with cold atoms.展开更多
This study presents an experiment on diffuse light cooling of atoms in a cylindrical cavity.We focus on the controlling of the shape of the atom cloud by placing the cooling beams in appropriate positions.The Gauss-li...This study presents an experiment on diffuse light cooling of atoms in a cylindrical cavity.We focus on the controlling of the shape of the atom cloud by placing the cooling beams in appropriate positions.The Gauss-like shape of the atomic cloud is demonstrated.The number of cold atoms detected in the cavity is increased,thereby improving the signal-to-noise ratio of the clock signal.展开更多
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
We cool 85Rb atoms in an integrating sphere directly from a vapor background using diffuse light generated by multiple reflections of laser beams in the inner surface of the integrating sphere. We compare and analyze ...We cool 85Rb atoms in an integrating sphere directly from a vapor background using diffuse light generated by multiple reflections of laser beams in the inner surface of the integrating sphere. We compare and analyze the different features of cold 85Rb atoms and cold 87Rb atoms in diffuse light cooling, which are important in applying 85Rb and 87Rb isotopes in many experiments on testing fundamental physics.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 11074262 and 11034008,and the National High-Tech Research and Development Program of China under Grant No 2012AA120702.
文摘The Ramsey fringes with a linewidth of 45 Hz and a signal-to-noise ratio of 120 are demonstrated for a integrating sphere atom clock.The cycle time of the atom clock is reduced to 80 ms with the help of a pulsed cooling method.This result indicates that the short-term stability of the clock is in the order of 10^(-12).
基金Supported by the National Natural Science Foundation of China under Grant Nos 11074262 and 11034008, and the National High-Tech Research and Development Program under Grant No 2012AA120702.
文摘The Faraday rotation of weak linearly polarized probe light is observed as it passes through a sample of cold ^87Rb atoms prepared by diffused light in an integrating sphere. The rotation angle of the probe light-polarization as functions of laser intensity, detuning and biased magnetic field is measured. A Ramsey fringe with a linewidth of 35 Hz and contrast up to 92% is demonstrated. This method has potential applications in improving the performance of atomic clocks with cold atoms.
基金Supported by the National Natural Science Foundation of China under Grant Nos 11074262 and 11034008the National High-Tech Research and Development Program under Grant No 2012AA120702.
文摘This study presents an experiment on diffuse light cooling of atoms in a cylindrical cavity.We focus on the controlling of the shape of the atom cloud by placing the cooling beams in appropriate positions.The Gauss-like shape of the atomic cloud is demonstrated.The number of cold atoms detected in the cavity is increased,thereby improving the signal-to-noise ratio of the clock signal.
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.
基金supported by the National Natural Science Foundation of China under Grant Nos. 10874193,11074262, and 11034008
文摘We cool 85Rb atoms in an integrating sphere directly from a vapor background using diffuse light generated by multiple reflections of laser beams in the inner surface of the integrating sphere. We compare and analyze the different features of cold 85Rb atoms and cold 87Rb atoms in diffuse light cooling, which are important in applying 85Rb and 87Rb isotopes in many experiments on testing fundamental physics.
