We present a nonlinear theory of light velocity reduction in a three-levelΛsystem based on electromagnetically induced transparency.Analysis shows that probe field propagates with a velocity that is quite strongly de...We present a nonlinear theory of light velocity reduction in a three-levelΛsystem based on electromagnetically induced transparency.Analysis shows that probe field propagates with a velocity that is quite strongly dependent on its intensity instead of being merely approximately dependent on the coupling intensity.Moreover,the minimum group velocity of the probe field is analytically given for a given input power.展开更多
We report a diode stack end-pumped Nd：GdV04 slab laser with a near-diffraction-limited beam. The output power of 45.8 W at 1064nm is obtained under the pumping power of 147 W, with the optical-optical conversion effi...We report a diode stack end-pumped Nd：GdV04 slab laser with a near-diffraction-limited beam. The output power of 45.8 W at 1064nm is obtained under the pumping power of 147 W, with the optical-optical conversion efficiency of 31.2%, and the slope efficiency is 39.6%.展开更多
We propose that a slowly-moving standing wave can be used to manipulate the motion of an atomic wave packet in a hollow optical fibre.A cloud of cold atoms can follow the motion of such a slow wave.The evolution of an...We propose that a slowly-moving standing wave can be used to manipulate the motion of an atomic wave packet in a hollow optical fibre.A cloud of cold atoms can follow the motion of such a slow wave.The evolution of an initial Gaussian atomic wave packet in the moving standing wave is calculated by numerically solving the Schrödinger equation.Our calculation shows that by using a sufficiently strong field and by adjusting the velocity of the standing wave pattern,the motion of the atomic cloud can be controlled in a hollow fibre.展开更多
Based on the magnetic atomic guidance model proposed in our previous paper[Opt.Commun.160(1999)72],the quantum motion of atoms in a magnetic tube is discussed in detail.The non-adiabatic loss of atoms as result of spi...Based on the magnetic atomic guidance model proposed in our previous paper[Opt.Commun.160(1999)72],the quantum motion of atoms in a magnetic tube is discussed in detail.The non-adiabatic loss of atoms as result of spin-flip transition and the adiabatic condition for keeping atoms in the guidable state are also analysed.The result shows that the atoms can be guided in the magnetic waveguide with a higher guiding efficiency by choosing suitable parameters of the magnetic tube.展开更多
基金Supported in part by the National Natural Science Foundation of China under Grant Nos.19834060 and 19975027.
文摘We present a nonlinear theory of light velocity reduction in a three-levelΛsystem based on electromagnetically induced transparency.Analysis shows that probe field propagates with a velocity that is quite strongly dependent on its intensity instead of being merely approximately dependent on the coupling intensity.Moreover,the minimum group velocity of the probe field is analytically given for a given input power.
基金Supported by the National Natural Science Foundation under Grant No 90201017, and the Excellent Young Teachers Programme of the Ministry of Education of China.
文摘We report a diode stack end-pumped Nd：GdV04 slab laser with a near-diffraction-limited beam. The output power of 45.8 W at 1064nm is obtained under the pumping power of 147 W, with the optical-optical conversion efficiency of 31.2%, and the slope efficiency is 39.6%.
基金Supported by the National Natural Science Foundation of China under Grants Nos.19975027 and 19834060Specific Academic Research Foundation for Doctoral Candidates.
文摘We propose that a slowly-moving standing wave can be used to manipulate the motion of an atomic wave packet in a hollow optical fibre.A cloud of cold atoms can follow the motion of such a slow wave.The evolution of an initial Gaussian atomic wave packet in the moving standing wave is calculated by numerically solving the Schrödinger equation.Our calculation shows that by using a sufficiently strong field and by adjusting the velocity of the standing wave pattern,the motion of the atomic cloud can be controlled in a hollow fibre.
基金Supported by the National Natural Science Foundation of China under Grant Nos.19975027 and 19834060.
文摘Based on the magnetic atomic guidance model proposed in our previous paper[Opt.Commun.160(1999)72],the quantum motion of atoms in a magnetic tube is discussed in detail.The non-adiabatic loss of atoms as result of spin-flip transition and the adiabatic condition for keeping atoms in the guidable state are also analysed.The result shows that the atoms can be guided in the magnetic waveguide with a higher guiding efficiency by choosing suitable parameters of the magnetic tube.
