- 必威体育下载

姓名
邮箱
手机号码
标题
留言内容
验证码

摘要

通过求解全波矢布洛赫方程研究了两能级原子与飞秒超快激光脉冲的相互作用过程, 计算了不同拉比频率取值下原子所受光学偶极力和粒子数布居随时间的演化情况, 分析了光场失谐量对光学势分布情况的影响. 研究发现: 由飞秒激光场产生的横向光力的时间平均值并不等于零, 而是随着拉比频率的增加呈现振荡的增大趋势; 纵向光力的时间平均作用也并非是拉比频率的单调函数, 而是随着拉比频率的增加呈现周期性的振荡分布特性; 光学势的分布对光场的失谐量具有明显的依赖性, 随着失谐量的变化, 光学势的性质也随之发生了改变.

关键词:

Abstract

In 2011, Kumar et al. (2011 Phys. Rev. A 84043402) studied the light force acting on a beam of neutral two-level atoms superimposed on a few-cycle-pulse Gaussian laser field under both resonant and off-resonant conditions by solving the optical Bloch equation beyond the rotating-wave approximation, and they found that under resonant condition the transverse component of the light force shows oscillatory behavior but vanishes when a time average is taken, and the time averaged longitudinal force is nonzero only when the Rabi frequency is smaller than the resonant frequency and vanishes when the Rabi frequency is equal to or larger than the resonant frequency. In this paper, we investigate further the strong nonlinear optical interaction between a two-level atomic system and a femtosecond Gaussian laser pulse by solving numerically the full-wave optical Bloch equations through using the predictor-corrector method. It is found that the light forces and the light potentials are sensitive to the value of the Rabi frequency and the detuning of the laser field. Under the resonant condition, the instant light forces induced by the femtosecond laser pulse change their signs as a function of time. The instant longitudinal light force changes its sign at twice the Rabi frequency, while the instant transverse light force changes its sign at twice the light carrier-wave frequency. However, none of the time-averaged light forces is zero, showing periodical oscillation characters as a function of Rabi frequency. Both of the time-averaged longitudinal and transverse light forces oscillate at the Rabi frequency corresponding to the pulse area of 2 ${\text{π}}$ . The time-averaged transverse light force shows also a trend of enhancement with Rabi frequency increasing, and the time-averaged longitudinal light force shows also a saturation trend with the increase of the Rabi frequency. The optical potential depends strongly on the detuning. It changes gradually from repulsive potential to attractive potential when the detuning defined here changes from negative to positive detuning. When the field is nearly resonant, the optical potential then oscillates between repulsive and attractive potentials. Therefore, neutral atoms can be focused, defocused, trapped, splitted or steered by the femtosecond laser field with appropriate detuning and Rabi frequency.

Keywords:

作者及机构信息

通信作者:刘纪彩,jicailiu@ncepu.edu.cn

基金项目:国家自然科学基金(批准号: 11574082)和中央高校基本科研业务费(批准号: 2018MS050)资助的课题.

Authors and contacts

Corresponding author:Liu Ji-Cai,jicailiu@ncepu.edu.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant No. 11574082) and the Fundamental Research Funds for the Central Universities of China (Grant No. 2018MS050).

文章全文: translate this paragraph

参考文献

[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
[11]
[12]
[13]
[14]
[15]
[16]
[17]
[18]
[19]
[20]
[21]
[22]
[23]
[24]
[25]
[26]
[27]
[28]
[29]
[30]
[31]
[32]
[33]
[34]
[35]
[36]
[37]
[38]
[39]
[40]
[41]
[42]
[43]

施引文献

下载: 全尺寸图片幻灯片

下载: 全尺寸图片幻灯片

下载: 全尺寸图片幻灯片

[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
[11]
[12]
[13]
[14]
[15]
[16]
[17]
[18]
[19]
[20]
[21]
[22]
[23]
[24]
[25]
[26]
[27]
[28]
[29]
[30]
[31]
[32]
[33]
[34]
[35]
[36]
[37]
[38]
[39]
[40]
[41]
[42]
[43]

[1]	李沫, 陈飞良, 罗小嘉, 杨丽君, 张健.原子芯片的基本原理、关键技术及研究进展. 必威体育下载 , 2021, 70(2): 023701.doi:10.7498/aps.70.20201561
[2]	吴彬, 程冰, 付志杰, 朱栋, 邬黎明, 王凯楠, 王河林, 王兆英, 王肖隆, 林强.拉曼激光边带效应对冷原子重力仪测量精度的影响. 必威体育下载 , 2019, 68(19): 194205.doi:10.7498/aps.68.20190581
[3]	赵磊, 张琦, 董敬伟, 吕航, 徐海峰.不同原子在飞秒强激光场中的里德堡态激发和双电离. 必威体育下载 , 2016, 65(22): 223201.doi:10.7498/aps.65.223201
[4]	施建珍, 许田, 周巧巧, 纪宪明, 印建平.用波晶片相位板产生角动量可调的无衍射涡旋空心光束. 必威体育下载 , 2015, 64(23): 234209.doi:10.7498/aps.64.234209
[5]	周琦, 陆俊发, 印建平.可控双空心光束的理论方案及实验研究. 必威体育下载 , 2015, 64(5): 053701.doi:10.7498/aps.64.053701
[6]	周巧巧, 施建珍, 纪宪明, 印建平.用弧形波晶片产生矢量光束及其强聚焦的特性研究. 必威体育下载 , 2015, 64(5): 053702.doi:10.7498/aps.64.053702
[7]	刁文婷, 何军, 刘贝, 王杰英, 王军民.利用蓝失谐激光诱导微型光学偶极阱中冷原子间的光助碰撞提高单原子制备概率. 必威体育下载 , 2014, 63(2): 023701.doi:10.7498/aps.63.023701
[8]	陈国钧, 周巧巧, 纪宪明, 印建平.用线偏振光产生可调矢量椭圆空心光束. 必威体育下载 , 2014, 63(8): 083701.doi:10.7498/aps.63.083701
[9]	陆俊发, 周琦, 潘小青, 印建平.可操控二种冷原子或冷分子样品的光学双阱新方案及其实验研究. 必威体育下载 , 2013, 62(23): 233701.doi:10.7498/aps.62.233701
[10]	张春艳, 赵清, 傅立斌, 刘杰.飞秒强激光场中氢原子团簇的各向异性膨胀. 必威体育下载 , 2012, 61(14): 143601.doi:10.7498/aps.61.143601
[11]	徐淑武, 周巧巧, 顾宋博, 纪宪明, 印建平.用空间光调制器产生三维光阱阵列. 必威体育下载 , 2012, 61(22): 223702.doi:10.7498/aps.61.223702
[12]	顾宋博, 徐淑武, 陆俊发, 纪宪明, 印建平.用液晶空间光调制器产生光阱阵列. 必威体育下载 , 2012, 61(15): 153701.doi:10.7498/aps.61.153701
[13]	陆俊发, 周琦, 纪宪明, 印建平.实现冷原子、冷分子光学囚禁的组合三光学势阱方案. 必威体育下载 , 2011, 60(6): 063701.doi:10.7498/aps.60.063701
[14]	卢向东, 李同保, 马艳, 汪黎栋.激光汇聚Cr原子沉积的原子光学特性研究. 必威体育下载 , 2009, 58(12): 8205-8211.doi:10.7498/aps.58.8205
[15]	纪宪明, 徐淑武, 陆俊发, 徐冬梅, 印建平.用错位相位光栅产生的可调光学双阱. 必威体育下载 , 2008, 57(12): 7591-7599.doi:10.7498/aps.57.7591
[16]	唐霖, 黄建华, 段正路, 张卫平, 周兆英, 冯焱颖, 朱荣.冷原子穿越激光束的量子隧穿时间. 必威体育下载 , 2006, 55(12): 6606-6611.doi:10.7498/aps.55.6606
[17]	陆俊发, 纪宪明, 印建平.实现冷原子或冷分子囚禁的可控制光学四阱. 必威体育下载 , 2006, 55(4): 1740-1750.doi:10.7498/aps.55.1740
[18]	郑森林, 陈君, 林强.光脉冲序列对三能级原子重力仪测量精度的影响. 必威体育下载 , 2005, 54(8): 3535-3541.doi:10.7498/aps.54.3535
[19]	段正路, 张卫平, 李师群, 周兆英, 冯焱颖, 朱荣.物质波在原子波导中传输时的波导衔接激发. 必威体育下载 , 2005, 54(12): 5622-5628.doi:10.7498/aps.54.5622
[20]	纪宪明, 印建平.冷原子或冷分子囚禁的可控制光学双阱. 必威体育下载 , 2004, 53(12): 4163-4172.doi:10.7498/aps.53.4163

计量

文章访问数:6930
PDF下载量:71
被引次数:0

搜索

留言板