结合二维分光光谱仪与可调谐法布里-珀罗干涉仪的超高分辨率光谱测量技术研究  

Ultra-High-Resolution Spectrometry Incorporating Two-Dimension Dispersing Spectrometer and Tunable Fabry-Perot Filter

作　　者：柳文娟[1] 胡澄之 姜培培[1] 吴波[1] 沈永行[1] 

机构地区：[1]浙江大学光电系,现代光学仪器国家重点实验室,浙江杭州310027

出　　处：《光学学报》2015年第6期358-364,共7页Acta Optica Sinica

基　　金：国家自然科学基金(11304277、61405174)

摘　　要：提出并实验演示了一种新型的超高分辨率光谱测量技术,通过将二维分光的高分辨率面阵光谱仪和可调谐法布里-珀罗（F-P）干涉仪相结合来实现超高分辨率的光谱测量,其中高分辨率面阵光谱仪的分辨率优于可调谐F-P干涉仪的自由光谱范围（FSR）。所采用的可调谐F-P干涉仪光谱范围为780-840 nm,FSR为3.75 GHz,精细度大于100。利用虚拟成像阵列和平面衍射光栅构建了二维分光面阵光谱仪,实现了17.4 nm（792-809.4 nm）光谱范围内0.7 GHz的光谱分辨率,分辨率值高于可调谐F-P的FSR。二者的结合实现了优于37.5 MHz的超高光谱分辨率。利用所构建的光谱仪实际测量了锁模钛宝石激光器的激光光谱,证实可以较为清晰地分辨其间隔为76.3 MHz的各个纵模。A new method for hyperfine spectrum measurement is mentioned and experimentally demonstrated. Ultra-high-resolution spectrometry is obtained through incorporating a two-dimensional （2-D） dispersing CCD spectrometer and a tunable Fabry- Perot （F- P） filter and the spectral resolution of the 2- D dispersing CCD spectrometer is better than that of the tunable F-P filter. The F-P scanning interferometer covers a wavelength range of 780~840 nm with a free spectral range （FSR） of 3.75 GHz and a fineness of 100. With the use of 2- D dispersing CCD spectrometer consisting of a virtually-imaged phased-array （VIPA） and a diffraction grating, realtime high- resolution spectral measurement has been realized in a wide spectral range. Resolution as high as 0.7 GHz obtained with the 2-D dispersing CCD spectrometer in a spectral range of 17.4 nm （792~809.4 nm）, is higher than that of the tunable F- P filter. By combining the 2- D spectrometer with a tunable F- P based scanning interferometer, hyperfine spectral resolution higher than 37.5 MHz is achieved. The laser spectrum of the modelocked Ti：sapphire laser is measured with the spectrometer, proving that its longitudinal mode with the spacing of 76.3 MHz can be distinguished clearly.

关 键 词：光谱学 高分辨率测量 虚拟成像陈列 可调谐法布里-珀罗 面阵光谱仪 

分 类 号：O436[机械工程—光学工程]