基于复曲面镜的高分辨Czerny-Turner光谱探测技术

High-resolution Czerny-Turner spectral detection technology based on toric mirror

Czerny-Turner型光栅光谱探测技术凭借其色散均匀、灵敏度高、光谱探测范围宽等优势成为现代光谱仪器研究的热点,广泛应用在生物学、医学、材料科学等领域,但受限于像散,系统的成像质量和分辨力难以进一步提高。为解决上述问题,提出了基于复曲面镜的高分辨Czerny-Turner光谱探测技术,通过复曲面镜子午和弧矢方向焦距不同的特性来校正像散,在保证C-T型光谱仪高灵敏、宽谱段优点的前提下,改善成像质量,提高系统分辨力。理论分析和实验结果表明,复曲面镜消像散光谱仪样机基于10nm扫描间隔的光谱拼接技术,在400~800nm工作波段范围内光谱分辨力达到0.020nm。为C-T型光谱仪的分辨力改进提供了一种可行途径。

Czerny-Turner type grating spectral detection technology has become a hot spot in modern spectral instrument research due to its uniform dispersion, high sensitivity, and wide spectral detection range. It is widely used in biology, medicine, materials science and other fields, but is limited by astigmatism It is difficult to further improve the imaging quality and resolution of the system. In order to solve the above problems, a high-resolution Czerny-Turner spectral detection technology based on toric mirror is proposed. The astigmatism is corrected by the different focal lengths of the toric mirror in the meridional and sagittal directions. On the premise of ensuring the advantages of high sensitivity and wide band of the C-T spectrometer, the imaging quality and the system resolution are improved. Theoretical analysis and experimental results show that the prototype of toric mirror destigmatism spectrometer based on spectral splicing technology of 10 nm scanning interval reaches 0.020 nm in the working band range of 400~800 nm. This technique provides a feasible way to improve the resolution of C-T spectrometer.