本文讨论了全息凹面光栅单色仪杂散光的来源,提出了一种测定杂散光的新方案,采用光强递推、现场标定并结合光子计数技术解决了大量级范围内的线性标定.在光子计数器取样时间为1秒的情况下获得了10~(-12)量级的测量限.为了消除光源强度的波动产生的误差,提高实验的精确度,文章介绍了新的设计思想.最后给出了对本研究室研制的喇曼光谱仪单色系统的杂散光的测量结果.

This article deals with the resources of the stray light in holographic concave grating monochromators. A new plan of measuring the stray light is suggested. The linear calibration in large-order-scale is solved by using light intensity recursion, real environment calibration and photon counting technique. The measuring limit of order 10-12 is obtained under the condition of the sampling time of the photon counter in one second. This article introduces a new designing idea for eliminating the error caused by the fluctuation of light source intensity and for improving the precision and accuracy of experiment. Finally, the measurement results of the stray light in the monochromatic system of the Raman spectroscopic instrument designed and produced by our institute are given.