BEC冷原子物理报告
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激光的单模/双模/基模/高阶模
First experiments bringing together BEC physics and cavities concentrated on correlation measurements using single atom counting, studied cavity enhanced superradiance of a BEC in a ring cavity, observed nonlinear and heating effects for ultracold atoms in an ultrahigh-finesse cavity and achieved very high control over the condensate position within an ultrahigh-finesse cavity using atom chip technology.
• the influence of higher-order cavity modes, yields maximum singleatom couplings ？for the two polarization components (solid lines).
• 理论方法
பைடு நூலகம்
Figure 3 | Energy spectrum of the coupled BEC–cavity system.
说明的问题
• a second avoided crossing at probe frequencies resonant with the bare atomic • In our system, this results in a clearly visible change of the energy spectrum with respect to a system with a single cavity mode only 分析 见整段
• To test the square-root dependence of the normal mode splitting on the number of atoms in the BEC, a second measurement was conducted
• We set the cavity frequency to ？and record the detuning of the lower coupled state from the bare atomic resonance ？as a function of the number of atoms as displayed in Fig4.
• The dependence of on the number of atoms is well described by a square root, as expected from the Tavis– Cummings model (dashed lines) • for a weakly interacting BEC the size of the atomic cloud—and thus the spatial overlap with the cavity mode—depends on the atom number
First experiments bringing together BEC physics and cavities concentrated on correlation measurements using single atom counting, studied cavity enhanced superradiance of a BEC in a ring cavity, observed nonlinear and heating effects for ultracold atoms in an ultrahigh-finesse cavity and achieved very high control over the condensate position within an ultrahigh-finesse cavity using atom chip technology.
• the influence of higher-order cavity modes, yields maximum singleatom couplings ？for the two polarization components (solid lines).
• 理论方法
பைடு நூலகம்
Figure 3 | Energy spectrum of the coupled BEC–cavity system.
说明的问题
• a second avoided crossing at probe frequencies resonant with the bare atomic • In our system, this results in a clearly visible change of the energy spectrum with respect to a system with a single cavity mode only 分析 见整段
• To test the square-root dependence of the normal mode splitting on the number of atoms in the BEC, a second measurement was conducted
• We set the cavity frequency to ？and record the detuning of the lower coupled state from the bare atomic resonance ？as a function of the number of atoms as displayed in Fig4.
• The dependence of on the number of atoms is well described by a square root, as expected from the Tavis– Cummings model (dashed lines) • for a weakly interacting BEC the size of the atomic cloud—and thus the spatial overlap with the cavity mode—depends on the atom number