利用超快飞秒激光缔合技术相干制备密集超冷分子的实验研究

项目名称： 利用超快飞秒激光缔合技术相干制备密集超冷分子的实验研究

项目编号： No.61308023

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 武寄洲

作者单位： 山西大学

项目金额： 28万元

中文摘要： 制备密集的基态超冷分子是超冷物理研究领域的热点问题，对于研究超冷分子化学、分子玻色-爱因斯坦凝聚、以及量子操控等具有极为重要的意义。本项目基于超冷铯分子光谱的精密测量与宽带光谱的精确波段选择，提出超快飞秒激光缔合方案。利用超冷铯分子独有的长程态双阱结构，在光学偶极阱中俘获高密度超冷铯原子样品，将超快飞秒激光作为光缔合光源，实现对超冷铯分子布居转移的快速有效调控，相干制备密集的振转基态超冷分子，有效提高分子产率。本项目有机结合"超冷分子"与"超快激光"的优点，克服了由于中间态分子能级寿命短而导致的消相干现象的不利影响，研究宽带激光光场与超冷分子的相互作用机制，探索超冷分子量子态演化的物理机制与相关瞬态动力学行为。

中文关键词： 超冷分子；相干制备；光缔合光谱；精密测量；量子态操控

英文摘要： Production of ground state ultracold dense molecules is a cutting-edge issue in ultracold physics research field. It is of great significance for the research on ultracold molecular chemistry, molecular Bose-Einstein Condensation, and quantum control. This project proposes the ultrafast femtosecond laser photoassociation scheme, based on the precise measurement of ultracold cesimu specotroscopy and accurate wave band selection of broadband spectra. By utilizing the unique double well structure of long-range state in the ultracold cesium molecular potential, the ultracold cesium atomic sample with high density will be confined in an optical dipole trap, and then we will take ultrafast femtosecond laser as photoassociation laser source, to realize the rapid and efficient control of ultracold cesium molecular population transfer, the coherent production of dense ultracold molecules in ro-vibrational ground state, and the improvement of the molecular productivity. This project well combined "ultracold molecules" and "ultrafast laser". During the transient interaction time scale of femtosecond, the harmful influences of decoherence, stemming from the short lifetime of the molecular level in the intermediate state, have been overcomed. In addition, we will investigate the interaction mechanism between the broadband la

英文关键词： ultracold molecules；coherent production；photoassociation spectroscopy；precision measurement；control of quantum state