摘要
声光可调谐滤波器(AOTF)是一种新型的色散元件,被广泛应用到光谱成像领域,但由于其在调谐时,衍射角会随着波长的变化而变化,造成图像漂移。为了解决AOTF光谱相机晶体色散引起的图像漂移问题,采用了在晶体出射面外添加棱镜的方法。通过分析晶体旋光性对介质外衍射角的影响,比较发现当入射光极角很大时,必须考虑晶体的旋光性对介质外衍射角的影响,在此基础之上分析棱镜偏折角与棱镜顶角和材料的关系,当入射光极角为28°时,添加顶角为10.1°的棱镜可得到0.0007°的消色散偏差。由此说明,在光路中添加材料和顶角合适的棱镜,可以很好地消除AOTF光谱相机中晶体的色散。
Acousto-optic tunable filter （AOTF） is a new type of dispersion components. It is widely used in the field of hyper-spectral imaging, but diffraction angle changes along with wavelength when tuning, which will cause drift of images. To solve the problem caused by crystal dispersion of AOTF spectral camera, a prism is added to the emergent surface of the crystal. Through the analysis of crystal optical rotation influence on crystal outside diffraction angle, it is found that when the incident angle is very large, crystal optical rotation must be taken into consideration. According to the basic analysis above, the relationship among prism vertex angle, the prism material and prism deviation angle is analyzed. The results show that when the incident angle is 28°, dispersion residual deviation of 0.0007° is achieved by adding 10.1° prism. This implies that the dispersion of AOTF spectral camera can be eliminated by adding the prism of proper material and vertex angle.
出处
《激光与光电子学进展》
CSCD
北大核心
2014年第6期160-166,共7页
Laser & Optoelectronics Progress
基金
国家科技攻关项目(2007BA107A00-1)
关键词
光谱学
光谱成像
声光可调谐滤波器
介质外衍射角
色散
棱镜
spectroscopy
spectral imaging
acousto-optic tunable filter
crystal outside diffraction angle
dispersion
prism
