Hyper-resolution Brillouin-rayleigh Spectroscopy by Optical Beating Technique

采用光学跳动技术的超分辨率布里渊-瑞利光谱

基本信息

批准号：
05452117
负责人：
TAKAGI Kenshiro
金额：
$ 4.67万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

The light scattering system with a scanning Fabry-Perot interferometer and a high-sensitivity photo-multiplier has long been the general standard of all the Brillouin scattering experiments ever since Fleury and Chiao first succeeded in the observation of a Brillouin triplet in the middle of the 1960's. Every endeavor has been made to improve the resolution of the experiment, which has not generally been considered satisfactory. A very sophisticated system in which a computer controls multipass Fabry-Perot etalon or etalons in tandem, for example, has been developed. To reduce the additional line broadening introduced by the spectrum width of the light source, a single longitudinal mode laser with a frequency-stabilizing device has been utilized, the resultant lack of output power being compensated by the increased detection sensitivity of a cooled photo-multiplier tube followed by a photon counter. The Brillouin scattering system of today is thus becoming more and more complicated tho … More ugh its essential part still stays within the experiment of Fleury and Chiao. Nevertheless, all these efforts to achieve higher resolution seems to have been rewarded with rather limited success.On the other hand, the idea of a Brillouin scattering experiment base on a completely different principle has been proposed, i.e., the technique of light beating spectroscopy in which the Fabry-Perot etalon is replaced with a spectrum analyzer. Various experiments have been tried along this line, but most of them were unsuccessful with only one exception. Recently we succeeded in the development of a new system of hyper-resolution Brillouin scattering in which the frequency resolution was increased by 10^3-10^4 times. In this study, we further improved the light scattering system with which we conducted some sophisticated experiments, including (1) observation of phonon relaxation phenomenon in polymer solids, (2) discovery of thermal phonon resonance and (3) investigation of asymmetry in Brillouin triplet observed under non-equilibrium state. Less

自从Fleury和Chiao首先成功地观察1960年代中期的Brillouin Triplet以来，带有扫描Fabry-Perot干涉仪和高敏感性照相的光散射系统一直是所有Brillouin散射实验的一般标准。已经做出了每项努力，以改善实验的解决方案，这通常不被认为令人满意。一个非常复杂的系统，计算机在串联中控制了多通Fabry-Perot Etalon或Etalons。为了减少由光源的光谱宽度引入的额外线扩展，已经使用了带有频率稳定设备的单个纵向模式激光器，因此由于冷却光照射型管的检测灵敏度的增加而导致的缺乏输出功率会得到补偿，然后是光子柜台。因此，当今的布里渊散射系统正变得越来越复杂……它的重要部分仍然保留在弗莱里和乔的实验中。然而，所有这些实现更高分辨率的努力似乎都获得了相当有限的成功。另一方面，已经提出了一个完全不同原理的布里鲁因散射实验基础的想法，即，福克里 - 佩罗·埃塔隆（Fabry-Perot Etalon）用光谱分析仪代替了轻击光谱技术。已经尝试了各种实验，但是大多数实验失败了，只有一个例外。最近，我们成功地开发了一种新的高分辨率布里鲁因散射系统，其中频率分辨率增加了10^3-10^4倍。在这项研究中，我们进一步改善了我们进行了一些复杂的实验的光散射系统，包括（1）观察聚合物固体中的声子松弛现象，（2）在非平衡状态下观察到的brillouin三环中的不对称三重词的调查和（3）研究。较少的