强激光与粒子束2018，Vol.30Issue(7)：158-163,6.DOI:10.11884/HPLPB201830.180023
体布拉格光栅滤波片及其光谱成像应用
Volume Bragg grating filters and its spectral imaging application
摘要
Abstract
It is a new path to achieve hyperspectral imaging of obj ective area by employing the wavelength selectivity of thick volume Bragg gratings(VBGs).Based on the rigorous coupled wave theory,grating structures were optimally designed, fabricating craft were explored,the imaging system was constructed and the imaging ability of the VBG was verified.The results showed that:to obtain narrow filtered bandpass,we should improve the ratio of grating thickness and period,as well as strictly control the divergence angle of incident beam.For the beam quality of writing laser beams,vibration and polarization will all have large effect on the grating's fringe homogeneity,it is necessary to optimize the writing process by adopting vibration-proof meas-ures,optimizing writing light to uniform beam and tuning polarization directions parallel of both writing light beams to promote grating's diffraction efficiency and quality.The two-dimensional spatial imaging ability of VBG were validated.Under transmis-sion incidence of wide spectral light source,the filtered bandpass was about 5 nm and spatial resolution was about 4 lines/mm;under diffuse reflection incidence,spatial resolution was about 4.9 lines/mm by adopting grating pair to compensate the disper-sion.关键词
衍射光学/体布拉格光栅/耦合波理论/光谱成像Key words
diffraction optics/volume Bragg grating/coupled wave theory/spectral imaging分类
数理科学引用本文复制引用
段佳著,赵祥杰,胡奇琪,吴凡,骆永全,张大勇..体布拉格光栅滤波片及其光谱成像应用[J].强激光与粒子束,2018,30(7):158-163,6.基金项目
国家自然科学基金项目(61575179) （61575179）
中国工程物理研究院科技发展基金项目(2015B0401082) （2015B0401082）
