| The ion trap provides a potent physical system with its unique merit single trapped and laser cooled ion has become an important part in the quantum information researches and precise spectroscopy especially in optical frequency standards in recent years.This thesis reports mainly on the experimental realization and demonstration of single trapped and laser cooled 40 Ca + . This provides an experimental base on the future optical frequency standards and quantum information researches.Two miniature ion trap systems were built up, including the designs of the RF circuits, the external magnetic loops, as well as the improvement and testing of the laser beams and of the imaging system for PMT, also the programs for the experiments.The following experiments were carried on the type I miniature Paul trap:1 The fluorescence signal of the trapped ions was detected in the presence of both the cooling and re-pumping laser. Several techniques are utilized to minimize the micromotion of trapped ions and to optimize the fluorescence signal, such as adding excess DC voltages to the compensation electrodes and end electrodes and reducing RF voltage etc. 2 The phase transition from ion clouds to ion crystal was observed in our miniature Paul trap for few ions.3 The single trapped laser cooled 40Ca+ was realized and deducing from the fluorescence lineshape, ion temperature was estimated to be 22mK.4 When adding the 729nm laser, the"quantum jumps"for single ion and two ions were detected respectively.An experimental scheme of ion trap ultratrace analysis (ITTA) for rare isotopic (41)Ca was proposed. This method associates with the merits of both atom trap trace analysis (ATTA) and Laser Resonance ionization Mass Spectroscopy (RIMS). An extremely high isotopic selectivity can be reached. The experimental setup is comparatively simple and cheap, and thermal ions can be trapped for a long time.
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