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Study on impurity separation by laser cooling

激光冷却杂质分离研究

基本信息

批准号：
10650726
负责人：
SATO Shunichi
金额：
$ 2.18万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650726/
关键词：
laser cooling impurity separation laser diode 回折格子セシウム原子

项目摘要

It is expected to obtain a high density atomic ensamble with almost zero velocity by decelerating atomic momentum accompanied with an absorption and emission cycle of a photon based on a laser cooling technique. This technique inherently has a potential to spatially control the atomic ensamble, which is resonant to specific laser frequency from the view point of motion control of an atomic beam by a kinetic action of light. This is attractive as a basic idea of a novel impurity separation method.In this research, we will intend to show the possibility of the impurity separation concept based on the laser cooling technique as one of novel material refining methods. The purposes of this research are development of high quality light source by using a high power laser diode, its application to practical laser cooling technique and control of the atomic velocity distribution.In this research, we developed an high power single frequency diode laser system which frequency can be controlled precisely by an electronic inputs. Additional light source is also prepared to pump the atoms that are expelled from an absorption and emission cycle used for the laser cooling. It was observed that the atomic velocity changed by the same frequency as the laser frequency sweep by measurement of the atomic velocity distribution. We discussed the relationship between the laser frequency sweep, and the cooling distance and the temperature. Moreover, we discussed the prospects of practical impurity separation.

利用激光冷却技术，通过对原子动量进行减速，并伴随着光子的吸收和发射循环，有望获得速度几乎为零的高密度原子系综。该技术固有地具有空间控制原子样品的潜力，从通过光的动力学作用的原子束的运动控制的观点来看，原子样品与特定的激光频率共振。作为一种新的杂质分离方法的基本思想，这是很有吸引力的。在本研究中，我们将试图展示基于激光冷却技术的杂质分离概念作为一种新的材料细化方法的可能性。本研究的目的是利用高功率半导体激光器研制高质量的光源，并将其应用于实际的激光冷却技术和原子速度分布的控制，在本研究中，我们研制了一个高功率单频半导体激光器系统，其频率可以通过电子输入精确控制。还准备了额外的光源来泵浦从用于激光冷却的吸收和发射循环中排出的原子。通过测量原子速度分布，观察到原子速度以与激光频率扫描相同的频率变化。讨论了激光频率扫描与冷却距离和温度的关系。并对杂质分离的应用前景进行了展望。