双光栅切换微型平场全息凹面光栅光谱仪

基于CCD的微型平场全息凹面光栅光谱仪，以其简单紧凑的结构和快速高效的工作方式在光谱分析领域获得了广泛的应用。但是，由于受限于色散距离，单纯依靠优化光栅像差很难进一步使光谱分辨率获得大幅提高。提出一种双光栅切换微型平场全息凹面光栅光谱仪的设计方法，用两个使用结构相同的光栅代替传统的单光栅设计，给出一个光谱范围为400~1000 nm光谱仪的具体设计，计算显示光谱分辨率最大可提高为原来的2.5倍。通过对光栅衍射效率的计算分析，说明此方法能够显著改善仪器的通光效率。设计制作了原理样机，进行了装调测试，实验结果与理论计算相吻合。

Abstract

The minitype flat-field holographic concave grating spectrograph equipped with CCD detectors are widely used for spectral analysis. They are accepted for some remarkable advantages, such as compact structure and rapid and efficient testing process. However, restricted by imaging distance of the spectrometer, it is difficult to improve the spectral resolution greatly just by optimization of the holographic concave grating. A design method of double-grating minitype flat-field holographic concave grating spectrograph is proposed. The single grating in conventional spectrograph is replaced by two gratings which are equipped with the same geometry. A double grating flat-field spectrograph with a wavelength range from 400 nm to 1000 nm is designed. The calculation results show that the resolution of the newly designed spectrograph can be almost two and a half times as great as the conventional spectrograph. The light throughput efficiency can also be greatly improved, which is demonstrated by analyzing diffraction efficiency of the grating. The double-grating minitype flat-field holographic concave grating spectrograph is developed and adjusted. The experimental results agree with the theoretical calculations very well.

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孔鹏, 唐玉国, 巴音贺希格, 齐向东, 李文昊, 崔锦江. 双光栅切换微型平场全息凹面光栅光谱仪[J]. 光学学报, 2013, 33(1): 0105001. Kong Peng, Tang Yuguo, Bayanheshig, Qi Xiangdong, Li Wenhao, Cui Jinjiang. Double-Grating Minitype Flat-Field Holographic Concave Grating Spectrograph[J]. Acta Optica Sinica, 2013, 33(1): 0105001.

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