Development of a Versitile Spectrometer for Light Scattering Spectroscopy

几个与光学多通道探测器结合使用的拉曼光谱仪现在可以在商业上买到。然而，它们不可避免地由三级单色仪组成，因此不适合于这样的拉曼光谱，因为需要更高的灵敏度。因此，开发高灵敏度的拉曼光谱仪受到了广大科技人员的强烈欢迎。我们首次采用了新的设计原则，开发了一种新型的拉曼光谱仪。首先，该系统应该比现有的系统灵敏得多，其次，如果需要，该系统可以作为单级光谱仪使用，包括样品在内的所有光学设置保持不变。后者使人能够将该系统用于多种目的或用途。试制是这样的：预单色器由两个凹面光栅组成，使得F数大大减少，并且还配备了旁路机构，以便在必要时将输入光直接发送到主光谱仪。通过观测电子起源的拉曼信号和高温超导体中的声子，详细研究了该系统的特性。结果证明，该审判系统是非常令人满意的。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，并提交了一篇关于该系统本身的文章。通过试验，新设计的拉曼光谱仪现在可以从Ritsu Oyo-Kogaku株式会社购买，还有另一个简单的版本可供选择。

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.