High Resolution and High Sensitivity Laser Spectroscopy Using Non-Classical Light

使用非经典光的高分辨率和高灵敏度激光光谱

• 批准号: 04452057
• 负责人: YABUZAKI Tsutomu
• 金额: $ 5.06万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 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-04452057/
• 关键词: Diode Laser; Laser Spectroscopy; High resolution Spectroscopy; Isotope Selection; 非古典光; 非線形相互作用

We have developed new methods of laser spectroscopy with high resolution and high sensitivity, the principles of which are considerably different from any other methods developed so far. In present methods, the characteristics of a free-running diode laser is used, i.e.very stable output power (amplitude) and large frequency (phase) noise causing the broadening of the spectral line. The phenomena used are based on the nonlinear interaction of atoms with such a laser field. It was found that such a laser field has more degree of freedom than a monochromatic laser field, so that it carries more information of atoms and molecules to be studied. The first method proposed and studied can be realized by a simple system, where a diode laser beam is applied to the sample and the temporal variation of the transmitted light intensity is detected. Frequency-analyzing the detected intensity fluctuation, we have found that the power spectrum includes simultaneously high resolution atomic spectra, such as the Zeeman and hyperfine spectra in both the ground and excited states, which are in a very wide frequency range from 100 kHz to more than 1 GHz. The second type proposed here is the isotope-selective spectroscopy, which enables us to observe the absorption spectra of a particular isotope from the mixed gaseous sample. The isotope selection is made by detecting a Zeeman frequency component of a particular isotope, as the laser frequency is scanned through the absorption lines of of various isotopes. Above methods of laser spectroscopy is useful particularly for the atoms in a particular circumstances. As such atoms, we have made the first studies on the neutral atoms in a superfluid helium, and also on the gaseous atoms existing in the vicinity of the surface of solids.

我们开发了具有高分辨率和高灵敏度的激光光谱新方法，其原理与迄今为止开发的任何其他方法有很大不同。在目前的方法中，使用自由运行的二极管激光器的特性，即非常稳定的输出功率（幅度）和导致谱线展宽的大频率（相位）噪声。所使用的现象基于原子与这种激光场的非线性相互作用。研究发现，这样的激光场比单色激光场具有更大的自由度，从而携带更多的待研究原子和分子信息。提出和研究的第一种方法可以通过一个简单的系统来实现，其中将二极管激光束施加到样品上并检测透射光强度的时间变化。对检测到的强度波动进行频率分析，我们发现功率谱同时包含高分辨率原子光谱，例如基态和激发态的塞曼光谱和超精细光谱，频率范围从100 kHz到1 GHz以上。这里提出的第二种类型是同位素选择性光谱，它使我们能够观察混合气体样品中特定同位素的吸收光谱。当激光频率通过各种同位素的吸收线扫描时，通过检测特定同位素的塞曼频率分量来进行同位素选择。上述激光光谱方法对于特定环境下的原子特别有用。作为这样的原子，我们首先对超流氦中的中性原子以及存在于固体表面附近的气态原子进行了研究。

项目成果

T.Yabuzaki: "Laser Spectroscopy" American Institute of Physics, 359 (1993)

T.Yabuzaki：“激光光谱学”美国物理研究所，359（1993）

Y.Takahashi: ""Possible nuclear polarization of La^<139>N in Nd^<3+> : LaAlo_3 for the test of time reversal invariance"" Nuclear Instrument and Methods in Physics Research. A336. 583-586 (1993)

Y.Takahashi：““Nd^<3> 中 La^<139>N 的可能核极化：用于测试时间反转不变性的 LaAlo_3””物理研究中的核仪器和方法。

H.Ito: "Spin-polarization by Optical Pumpeng with Selecfive Reflection" J.Phys.Soc.Japan. (1993)

H.Ito：“通过具有选择性反射的光学泵浦实现自旋极化”J.Phys.Soc.Japan。

U.Tanaka: "Frequency Stabilization of Diode Laser Using External Cavity and Doppler-Free Atomic Spectra" Japanese Journal of Applied Physics. (in press). (1994)

U.Tanaka：“使用外腔和无多普勒原子光谱的二极管激光器的频率稳定”日本应用物理学杂志。

H.Ito: "Accumulative Transfer of Transverse Magnetic Moment between Spin-Locked Rb and Cs Atoms" Journal of the Physical Society of Japan. (in press). (1994)

H.Ito：“自旋锁定 Rb 和 Cs 原子之间横向磁矩的累积传递”日本物理学会杂志。