Optical study for the absorbing crystal

目的：重新确认Tokugoro Shoda的研究，澄清了两种椭圆偏振光在晶体中传播的事实。规格：岩石标本是来自巴西米纳斯吉拉斯省Pocos de Caldas的塔夸里的一块浅成岩(霞石正长岩)，该岩石是1987年7月26日在教育部科学补助金(62041024)资助下收集的。出自日本地质博物馆、日本地质调查局、国立先进工业科学技术研究院。矿物组成有两种角闪石(钾质镁砂和钙质钠辉石)、钾长石、钠长石、霓石、锆石、辉石和黄铁矿等。钾质镁砂的光学性质是独一无二的，有待阐明。椭圆偏光显微镜的构造：新建造的显微镜主体是奥林巴斯光学有限公司生产的系统偏光显微镜BX-P。…生产的汞灯(SHL-100UVQ-2)更多东芝照明公司被用作光源。在光路中插入了Edmund Industrial Optics公司提供的窄带滤光片CJ43177，以选择波长为546 nm的单色光。两个可旋转的四分之一波片，下一个在偏振器和载物台之间，上一个在载物台和检偏器之间。分析系统的构建：介绍了一台Logitec中塔个人计算机LPC-PTIGBS和Media Controbernetics的Image-Pro Plus软件，对一台CCD相机(Sony CCD-IRIS DXC-108)的图像进行了分析。观测：一种角闪石晶体在常规偏光显微镜下表现出不完全消光。当下1/4波片从零点向逆时钟方向旋转13度，上1/4波片保持与下1/4波片相对应的适当方向时，观察到完全消光。这意味着椭圆度为0.23的椭圆偏振光可以在该晶体中传播。结果：这一观察结果保证了T.Shoda提出的理论的正确性。较少

Purpose: Reconfirmation of the research of Tokugoro Shoda which clarified the fact that two sorts of the elliptically polarized light propagate in a crystal is intended.Specimen: The rock specimen is a hypabyssal rock (Nepheline syenite) from Taquari, Pocos de Caldas, Minas Gerais, Brazil, which is collected at July 26th 1987 in aid of the Science Grant of the Ministry of Education (62041024). It is lent from Geological Museum, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology. Mineral composition are two sort of amphiboles (Potassic magnesioarfvedsonite and calcic arfvedonite), K-feldspar, Na-feldspar, aegirine, zircon, sphene and pyrite etc. The optical properties of potassic magnesioarfvedsonite is so unique to be elucidated.Construction of an elliptically polarizing microscope: The main body of the newly constructed microscope is the system polarizing microscope BX-P made by OLYMPUS OPTICAL CO., LTD. A mercury lamp (SHL-100UVQ-2, produced … More by Harison Toshiba Lighting Corp. is used as a light source. A narrow band path filter CJ43177 supplied by Edmund Industrial Optics is inserted in the optical path to select a monochromatic light of the 546nm wave length. Two rotatable quarter wave plates are set; the lower one is between the polarizer and the stage and upper one is between the stage and the analyzer. The direction of the lower quarter wave plate is measured from the direction that the vibrating direction of the faster wave in the plate coincide to the direction of the polarizer.Construction of analytical system: A Logitec middle tower personal computer LPC-PTIGBS with the software of Image-Pro Plus by Media Cybernetics is introduced to analyze the image of a CCD camera (SONY CCD-IRIS DXC-108).Observation: One of amphibole crystals shows incomplete extinction under the conventional polarizing microscope. On the case that the lower quarter wave plate is rotated 13 degrees to the anti-clock direction from the zero point and the upper quarter wave plate is hold to the appropriate direction corresponding to the lower, the complete extinction is observed. This means that the elliptically polarized light of the ellipticity of 0.23 can propagate in this crystal.Result: This observation guarantees the validity of the theory proposed by T. Shoda. Less