泵浦光椭圆度对铷原子极化率的影响  

Effect of pump beam ellipticity on Rb polarization

作　　者：王明才 汪之国[1] 杨开勇[1] 陈运达 Wang Mingcai;Wang Zhiguo;Yang Kaiyong;Chen Yunda(College of Optoelectronic Science and Engineering,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学光电科学与工程学院,湖南长沙410073

出　　处：《红外与激光工程》2018年第9期227-232,共6页Infrared and Laser Engineering

基　　金：国家自然科学基金(61671458)

摘　　要：在核磁共振陀螺系统中,需要用圆偏振光来泵浦碱金属(例如铷)原子,使其产生极化。然而实际应用中的泵浦光不是理想的圆偏振光,为了研究泵浦光椭圆度与铷原子极化率的变化关系,推算了泵浦光经过四分之一波片后的表达式,并由此得出泵浦光照射铷原子气室前的椭圆度,建立了数值仿真模型,研究了椭圆度对铷原子极化率的影响。同时通过实验得到了铷原子极化率与椭圆度的关系曲线。仿真和实验结果表明,泵浦光椭圆度越大,铷原子极化率越大,随着椭圆度的进一步增大,铷原子极化率增速变慢逐渐饱和;此外,相同的椭圆度下,铷原子极化率随着泵浦光功率的增大而增大。In nuclear magnetic resonance gyroscope(NMRG)system,circularly polarized light is utilized to pump alkali metal(for instance,rubidium)atoms in order to get them polarized.However,the pump beam is not ideal circularly polarized light in practical applications.In order to research the relationship between the pump beam ellipticity and the Rb polarization,the expression of the pump beam after passing through the quarter-wave plate was calculated,and the ellipticity of the pump beam before going through the rubidium gas cell was obtained.A numerical simulation model was established to study the influence of pump beam ellipticity on Rb polarization,the relationship between Rb polarization and pump beam ellipticity were obtained by experiment at the same time.Both the simulation and experiment results show that the Rb polarization increases with the increase of pump beam ellipticity,and with the further increase of pump beam ellipticity,the rate of Rb polarization growth slows down and gradually becomes saturated;In addition,Rb polarization increases with the increase of pump beam power for the same ellipticity.

关 键 词：椭圆度 铷原子极化率 核磁共振陀螺 泵浦光 

分 类 号：O562[理学—原子与分子物理]