Preliminary Investigation of the Vacuum Magnetooptic Effect : Evaluation of the Non-Resonant Magnetooptic Birefringence due to Low-Density Residual Gases

真空磁光效应的初步研究：低密度残余气体引起的非共振磁光双折射的评估

• 批准号: 04640382
• 负责人: YAMAMOTO Manabu
• 金额: $ 1.02万
• 依托单位: Tokyo University of Agriculture and Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04640382/
• 关键词: Vacuum; Magnetooptic effect; Optical anisotropy; Voigt effect; Semiconductor laser; Polarization analysis; Photon statistical noise; Extinction ratio; 光子統計雑音; 消光比

In a preliminary investigation of the vacuum magnetooptic effect, we evaluated the effect of non-resonant magnetooptic birefringence due to residual gases contained in the vacuum cell. We measured the magnetooptic birefringence coefficient of the gas under the atmospheric pressure. We used a semiconductor laser oscillating at 780 nm as a light source. The laser output flux was stabilized to 2X10^<-4>. The extinction ratio of the polarization analyzer was (2-3)X10^<-8>.Light from the laser was passed through a linear polarizer and a retarding plate to convert the light beam into an elliptically polarized state. We passed the light bean through a cell containing oxygen molecular gas, which was placed in magnetic field of 0.8T.The field was oriented at 45 degrees from the polarization azimuth of incident light and was transverse to the optical path. The polarization change caused by magnetically induced optical anisotropy of oxygen gas was detected with a polarization analyzer.The measured magnetooptic birefringence of oxygen molecule is expressed by DELTAn=ClambdaB^2, with C=-(5.4(〕SY.+-.〔)0.5)x10^<-15>[G^<-2>cm^<-1>](lambda=780nm, 16ﾟC, 1 atm.). The constant C for nitrogen and argon is smaller than that fo oxygen. The magnetooptic birefringence of residual gases at pressures above 10^<-10>[Torr] can affect the detection of the vacuum birefringence induced by a magnetic field.

在真空磁光效应的初步研究中，我们评估了由于真空室中的残余气体而引起的非共振磁光双折射的影响。测量了大气压下气体的磁光双折射系数。我们使用在780 nm处振荡的半导体激光器作为光源。激光输出通量稳定在2 × 10 - 4<-4>。偏振分析器的消光比为（2-3）X 10 - 13<-8>。来自激光器的光通过线性偏振器和延迟板以将光束转换成椭圆偏振状态。我们让光束通过一个含有氧分子气体的单元，将氧气分子置于0.8T的磁场中，磁场与入射光的偏振方位角成45度角，并与光路成横向。用偏振分析仪测量了氧气分子的磁致光学各向异性引起的偏振变化。测得的氧气分子的磁光双折射表示为：Δ n = C_（5.4）SY. ± C_（5.4）（<-15><-2><-1>λ = 780 nm，16 ℃，1 atm）。氮和氩的常数C小于氧的常数C。在高于10^ [Torr]的压力下，残余气体的磁光双折射<-10>可以影响由磁场引起的真空双折射的检测。

项目成果

K.Muroo,Y.Takubo and M.Yamamoto: "Resonant Voigt-effect spectrum of the Rb D_2 transition" Journal of the Optical Society of America B. B11(in press). (1994)

K.Muroo、Y.Takubo 和 M.Yamamoto：“Rb D_2 跃迁的共振 Voigt 效应光谱”美国光学学会杂志 B. B11（印刷中）。

K.Muroo, Y.Takubo, and M.Yamamoto: ""Resonant Voigt-effect spectrum of the Rb D_2 transition"" J.Opt.Soc.Am.B.vol.B11 (in press). (1994)

K.Muroo、Y.Takubo 和 M.Yamamoto：““Rb D_2 跃迁的共振 Voigt 效应谱””J.Opt.Soc.Am.B.vol.B11（印刷中）。

K.Muroo et al.: "Resonant Voigt-effect spectra of the Rb D_2 transition" OSA Annual Meeting Technical Digest,1992(Opt.Soc.Am.). 23. 11- (1992)

K.Muroo 等人：“Rb D_2 跃迁的共振 Voigt 效应光谱”OSA 年会技术文摘，1992（Opt.Soc.Am.）。

K.Muroo,Y.Takubo and M.Yamamoto: "Resonant Voigt-effect spectra of the Rb D_2 transition" Optical Society of America Ann.Mtg.Tech.Digest. 23. 11 (1992)

K.Muroo、Y.Takubo 和 M.Yamamoto：“Rb D_2 跃迁的共振 Voigt 效应光谱”美国光学学会 Ann.Mtg.Tech.Digest。

K.Muroo, Y.Takubo, and M.Yamamoto: ""Resonant Voigt-effect spectra of the Rb D_2 transition"" in Optical Society of America Annual Meeting Technical Digest. vol.23. 11 (1992)

K.Muroo、Y.Takubo 和 M.Yamamoto：“Rb D_2 跃迁的共振 Voigt 效应光谱”，美国光学学会年会技术文摘。