DETECTION OF MAGNETO-OPTIC EFFECT OF THE VACUUM-HIGH-SENSITIVITY POLARIZATION SPECTROSCOPY

真空高灵敏偏振光谱磁光效应检测

• 批准号: 11640388
• 负责人: TAKUBO Yoshitaka
• 金额: $ 2.5万
• 依托单位: TOKYO UNIVERSITY OF AGRICULTURE SND TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11640388/
• 关键词: MAGNETO-OPTIC EFFECT; QUANTUM VACUUM; POLARIZATION SPECTROSCOPY; OPTICAL CAVITY; 量子真空; 偏向分光法; 真空磁気光学効果

We investigated high-sensitivity polarization spectroscopy for detection of the magneto-optic effect of the vacuum.1) For detection of the ultra-small birefringence induced in the vacuum. Optical cavities are used to enhance the polarization signal. We proposed a polarization detection system in which a single cavity served two functions : signal enhancement and locking of a laser frequency. Using this system with a low finesse cavity we obtained the ' signal enhancement of 32 for the Faraday effect measurement. Meanwhile, we constructed a high-finesse cavity (F= 6 x 10^4 ), and investigated the optical anisotroy of the cavity mirrors using the polarization dependence cavity ring down method. We presented to minimize the anisotropy by optimization of the optical axes of the mirrors.2) We developed the high-sensitivity detection of the polarization signal for a single-pass arrangement. In order to reduce background noise we improved the extinction ratio of the polarization analyzer system to 10^<-10> so that the noise caused by intensity fluctuation of the light source was reduced to a level below that of shot noise. The minimum value that could be detected for the ellipticity change was 10^<-10> rad. We could detect the off-resonant Voigt effect of He gas that had the smallest value of the magnetically induced birefringence.The results thus obtained in the present study are useful for development of the polarization spectroscopic system to detect the magneto-optic effect of the vacuum

我们研究了高灵敏度偏振光谱技术用于真空磁光效应的探测。1）用于探测真空中的超小双折射。光学腔用于增强偏振信号。提出了一种单腔偏振探测系统，该系统具有信号增强和激光频率锁定两种功能。使用这种低精细度腔的系统，我们获得了32的信号增强的法拉第效应测量。同时，我们构建了一个高精细度腔（F= 6 × 10^4），并利用偏振相关腔衰荡方法研究了腔镜的光学各向异性。我们提出了通过优化反射镜的光轴来最小化各向异性。2）我们开发了一种高灵敏度的单通偏振信号检测装置。为了降低背景噪声，我们将检偏器系统的消光比提高到10 μ s<-10>，使光源强度波动引起的噪声降低到散粒噪声以下。可以检测到的椭圆度变化的最小值为10 μ <-10>rad。我们可以探测到He气体的非共振Voigt效应，它具有最小的磁致双折射值，这一结果对研制探测真空磁光效应的偏振光谱系统是有用的

项目成果

K.Muroo, K.Sato, Y.Takubo: "Cavity-Enhanced Detection System with an Optically Feedbacked Diode Laser for Faraday Effect Measurements"Japanese Journal Applied Physics Part II. 40・8A. L802-L804 (2001)

K.Muroo、K.Sato、Y.Takubo：“用于法拉第效应测量的光反馈二极管激光器的腔增强检测系统”日本应用物理杂志第 II 部分 40・8A (2001)。