The Rb Atom Laser Cooling And Imprisoned

Laser cooling and trapping of atoms is a new area in atomic physics, physicists pay more attention to it due to its physical significance and the possibility of wide application in the future. In this thesis, a realization of laser cooling and trapping of rubidium atoms is reported. Firstly, the history and development of laser cooling and trapping of neutral atoms and molecules is reviewed. Present study status and future development is prospected. Principle of laser cooling and trapping of atoms as well as techniques used in laser cooling and trapping are described. An experimental setup for laser cooling and trapping of rubidium atoms was established. The details of the apparatus including Rb cell, Rb source, magnetic field coils,the optical system, lasers and the monitoring of signal are then presented. The laser frequency stabilization is a key technique in the realization of laser cooling and trapping. To do this, temperature control circuit, a feedback circuit and Doppler-free saturated absorption spectroscopy method were used. The commercial diode laser was then stabilized to a linewidth of less than 1 MHz. The laser frequency was further shifted and scanned by an acousto-optical modulator. Laser cooling and trapping of Rb atoms was realized. The steady signal of laser trapped Rb atoms was observed by CCD camera. Captured pictures of trapped Rb atoms vary as experimental conditions, such as laser frequency, gradient of magnetic field, and the Rb vapor. Lastly the extension of the work is planned. Primary experimental preparation and scheme to do the high-resolution spectroscopy using the trapped Rb atoms are included.