Trial construction of a non-contacting measurement system of elastic constants for tiny crystals

微小晶体弹性常数非接触测量系统的试建

• 批准号: 13555167
• 负责人: TANAKA Katsushi
• 金额: $ 6.4万
• 依托单位: KAGAWA UNIVERSITY (2002)Kyoto University (2001)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13555167/
• 关键词: Brillouin scattering; DPSS laser; Photo multiplier; Elasticity; Etalon; 単結晶弾性率; 微小結晶; 固体レーザー; 分光器

A new apparatus for measuring elastic, constants of tiny crystals has been developed. The appa rates is based on the Brillouin scattering that is frequently applied to the measurement of non-metallic materials, for example ceramics or organic materials. The most of apparatus for measuring the Brillouin scattering in uses Ar-ion laser that has very large volume and electrical power required is quite large to obtain enough output power. We adopt a new light source that is diode pumped solid state (DPSS) laser, which has very small volume and high efficiency of conversion from electrical to light. The most important point of the light source for the Brillouin scattering is the line width (purity) of the light. We have checked the purity and confirmed that the line width is enough narrow for the Brillouin scatteringAnother key part of the apparatus is light detector ; the detector must has high sensitivity, stability and low noise feature. A photo multiplier is frequently used to the detector, however, conventional one has low quantum efficiency. We adopt a new type of photo multiplier that has a different material to emitter with high quantum efficiency of about 40% for the light of 532nmBy using such newly developed parts, we have succeeded to construct a new apparatus having small volume and high efficiency

本文介绍了一种测量微小晶体弹性常数的新装置。其原理是基于布里渊散射，常用于测量非金属材料，如陶瓷或有机材料。目前测量布里渊散射的仪器大多采用氩离子激光器，而氩离子激光器的体积和输出功率都很大。我们采用了一种体积小、光电转换效率高的新型光源--二极管泵浦固体激光器。对于布里渊散射来说，光源的最重要的一点是光的线宽（纯度）。我们已经检查了纯度，并确认线宽足够窄的布里渊散射装置的另一个关键部分是光探测器，探测器必须具有高灵敏度，稳定性和低噪声特性。光电倍增管是常用的光电探测器，但传统的光电倍增管量子效率低。我们采用了一种新型光电倍增管，它与发射极材料不同，对532 nm光的量子效率约为40%。通过使用这些新研制的器件，我们成功地构造了一种体积小、效率高的新器件。