We study the spatial periodicity effects on the differential light shift of noninteracting atoms in an optical lattice.Through the Rabi-spectrum approach,when the wavelength of the optical lattice is not magic,a reduc...We study the spatial periodicity effects on the differential light shift of noninteracting atoms in an optical lattice.Through the Rabi-spectrum approach,when the wavelength of the optical lattice is not magic,a reduction to the differential light shift is expected.The reduction results from the Bloch bands induced by the quantized motion in the periodic potential.Taking the microwave transition of rubidium atoms as an example,this reduction at some wavelengths can reach one order of magnitude,compared to the data without considering the spatial profile of the optical lattice.When the atomic temperature is considered,the differential light shift increases or decreases with temperature,depending on the wavelength of the lattice.Our results should be beneficial for microwave optical lattice clock and precision measurements.展开更多
We propose an experimental scheme of vacuum ultraviolet(VUV)and extreme ultraviolet(XUV)optical frequency standards with noble gas atoms.Considering metastable state 3𝑃2 noble atoms pumped by a conventional di...We propose an experimental scheme of vacuum ultraviolet(VUV)and extreme ultraviolet(XUV)optical frequency standards with noble gas atoms.Considering metastable state 3𝑃2 noble atoms pumped by a conventional discharging method,the atomic beam is collimated with transverse laser cooling at the metastable state and enters into the laser cavity in the proposed setup.Due to stimulated emission from the metasable state to the ground state inside the laser cavity consisting of VUV reflection coating mirrors,our calculations show that with enough population inversion to compensate for the cavity loss,an active optical frequency standard at VUV and XUV is feasible.展开更多
Nonlinear spectroscopy has become a useful tool in laser cooling,frequency stabilization and so on.We use the 455.5 nm light beam output of an external cavity diode laser to perform the saturation spectroscopy signal ...Nonlinear spectroscopy has become a useful tool in laser cooling,frequency stabilization and so on.We use the 455.5 nm light beam output of an external cavity diode laser to perform the saturation spectroscopy signal and polarization spectroscopy signal on the 6S_(1/2)→7P3/2 transition in cesium.The measured linewidth of the F4→4,5 transition is as narrow as 1.40 MHz and that of the F3→2,3 transition is 1.67 MHz.Both of them are very close to the natural linewidth of about 1.2 MHz.Our result is the narrowest measured linewidth of Cs 455 nm saturation spectroscopy signal to our knowledge.展开更多
An experiment setup for narrow linewidth superradiant laser based on the mechanism of an active optical clock is proposed with optical lattice trapped 40 Ca.We obtain the threshold pumping rate analytically and deduce...An experiment setup for narrow linewidth superradiant laser based on the mechanism of an active optical clock is proposed with optical lattice trapped 40 Ca.We obtain the threshold pumping rate analytically and deduce the linewidth of the superradiant laser in a bad cavity regime.The proposed laser has an extremely narrow linewidth at millihertz level and a power level of order 10^(-9) W.展开更多
基金Supported by the National Basic Research Program of China under Grant No 2011CB921501the National Natural Science Foundation of China under Grant Nos 61027016,61078026,10874008 and 10934010.
文摘We study the spatial periodicity effects on the differential light shift of noninteracting atoms in an optical lattice.Through the Rabi-spectrum approach,when the wavelength of the optical lattice is not magic,a reduction to the differential light shift is expected.The reduction results from the Bloch bands induced by the quantized motion in the periodic potential.Taking the microwave transition of rubidium atoms as an example,this reduction at some wavelengths can reach one order of magnitude,compared to the data without considering the spatial profile of the optical lattice.When the atomic temperature is considered,the differential light shift increases or decreases with temperature,depending on the wavelength of the lattice.Our results should be beneficial for microwave optical lattice clock and precision measurements.
基金by the National Natural Science Foundation of China under Grant No 10874009.
文摘We propose an experimental scheme of vacuum ultraviolet(VUV)and extreme ultraviolet(XUV)optical frequency standards with noble gas atoms.Considering metastable state 3𝑃2 noble atoms pumped by a conventional discharging method,the atomic beam is collimated with transverse laser cooling at the metastable state and enters into the laser cavity in the proposed setup.Due to stimulated emission from the metasable state to the ground state inside the laser cavity consisting of VUV reflection coating mirrors,our calculations show that with enough population inversion to compensate for the cavity loss,an active optical frequency standard at VUV and XUV is feasible.
基金Supported by the National Natural Science Foundation of China under Grant Nos 10874009 and 11074011.
文摘Nonlinear spectroscopy has become a useful tool in laser cooling,frequency stabilization and so on.We use the 455.5 nm light beam output of an external cavity diode laser to perform the saturation spectroscopy signal and polarization spectroscopy signal on the 6S_(1/2)→7P3/2 transition in cesium.The measured linewidth of the F4→4,5 transition is as narrow as 1.40 MHz and that of the F3→2,3 transition is 1.67 MHz.Both of them are very close to the natural linewidth of about 1.2 MHz.Our result is the narrowest measured linewidth of Cs 455 nm saturation spectroscopy signal to our knowledge.
基金Supported by the National Natural Science Foundation of China under Grant Nos 10874009 and 11074011.
文摘An experiment setup for narrow linewidth superradiant laser based on the mechanism of an active optical clock is proposed with optical lattice trapped 40 Ca.We obtain the threshold pumping rate analytically and deduce the linewidth of the superradiant laser in a bad cavity regime.The proposed laser has an extremely narrow linewidth at millihertz level and a power level of order 10^(-9) W.
