Development of a Versitile Spectrometer for Light Scattering Spectroscopy

一些与光学多通道检测器组合使用的拉曼光谱仪现在可在市场上买到。然而，这些不可避免地由三个阶段的单色性组成，因此，不适合于这种拉曼光谱，因为需要更高的灵敏度。我们首次采用新的设计原理，研制出一种新型的拉曼光谱仪;第一，该系统应比现有的系统灵敏得多;第二，如有必要，作为单级光谱仪，包括样品在内的所有光学设置保持不变。后者使人们能够将该系统用于多用途或用途。一种试制方法是，预单色器由两个凹面光栅组成，使F数大大降低，并进一步配备旁路机构，以便在必要时将输入光直接发送到主摄谱仪。通过对高温超导体中电子源和声子源的拉曼信号的观测，详细研究了该系统的特性。实践证明，该审判制度运行良好.我们已经发表了一篇关于用本系统观察到的超导能隙激发的重要文章，并将提交一篇关于本系统本身的文章。作为试验，我们现在可以从Ritsu Oyo Kogaku Co. Ltd.购买一台新设计的拉曼光谱仪。以及另一个简单的版本作为选项。

A few Raman spectrometers for a combined use with an optical multichannel detector are now commercially available. However, those are inevitably composed of three stages of monochromator, and thereby, are not suited to such Raman spectroscopies as higher sensitivity is needed. Consequently, development of a highly sensitive system is strongly welcome to many scientists and technicians in wide fields.We have for the first time developed a new-type of Raman spectrometer with a new design principle adopted ; first, the system should be much more sensitive as compared to the established ones, and second, the system can be utilized, if necessary, as a single-stage spectrometer with all optical setup left unchanged including a sample. The latter enables one to employ the system for versatile purpose or use. A trial manufacture is such that the premonochromator is composed of two concave gratings making F-number greatly reduced, and further is equipped with a bypass mechanism so as to send directly input light, if necessary, to a main spectrograph. The latter works very well for observing Raman signals with high freqency shift.The characteristics of the system were examined in detail by observing Raman signals of electronic origin as well as phonons in high-T_c superconductors. As a result, the trial system has been proved very satisfying. We have already published an important article concerning superconducting gap excitation observed with the present system, and are submitting an article concerning the system itself.By way of trial experiment, a newly designed Raman spectrometer is now available by purchase from Ritsu Oyo-Kogaku Co. Ltd., together with another simple version as an option.