Research on ion-atom cold collisions for ultra-stable atomic clocks

为了实现利用离子-原子冷碰撞实现离子冷却、态选择和态检测的新型实用原子钟，我们研制了冷原子束和离子阱装置，以及冷Rb束光抽运激光系统，以取代传统的氢脉泽等原子钟。至于激光器，我们采用了二次谐波产生（SHG）的795 nm（Rb D1线）使用双极化锂酸盐（PPLN）波导（WG）设备从1590 nm DFB激光器。

Toward novel practical atomic clocks using ion-cooling, state selection, and state detection by ion-atom cold collisions, replacing conventional atomic clocks such as hydrogen masers, we have developed devices for cold atom beam and ion trap, and laser systems for optical pumping of cold Rb beam. As for laser, we have adopted a second-harmonic-generation(SHG) of 795 nm(Rb D1 line) using periodically-poled-lithium-niobate(PPLN) waveguide(WG) device from a 1590 nm DFB laser.