Paillet Matthieu, Meunier François, Verhaegen Marc, Blais-Ouellette Sébastien, Martel Richard
Département de Chimie, Regroupement Québécois sur les Matériaux de Pointe (RQMP), Université de Montréal, Montréal, Québec H3C 3J7, Canada.
Rev Sci Instrum. 2010 May;81(5):053111. doi: 10.1063/1.3405839.
We designed a near infrared tunable resonance Raman spectroscopy system based on a tandem of thick volume Bragg gratings (VBGs). VBGs are here the constituents of two light filtering units: a tunable laser line filter (LLF) and a tunable notch filter (NF). When adapted in a micro-Raman setup with a single stage monochromator (1800 gr/mm grating), the tandem of LLF and NF allowed measurements of Raman signals down to +/-20 cm(-1). The good performance and fast tunability of the VBG Raman system was demonstrated on a sulfur powder and on a bulk single-walled carbon nanotube sample through a series of 22 Stokes and anti-Stokes spectra recorded at excitation wavelengths between 800 and 990 nm. The main drawbacks of the setup are the limited spectral range to the near infrared and the small angular acceptance of the filters (approximately 1 mrad), which causes mainly attenuation problems with the NF. The impact of the main limitations is discussed and solutions are provided.
我们基于厚体布拉格光栅（VBG）串联设计了一种近红外可调谐共振拉曼光谱系统。在这里，VBG是两个光滤波单元的组成部分：一个可调谐激光线滤波器（LLF）和一个可调谐陷波滤波器（NF）。当应用于配备单级单色仪（1800刻线/毫米光栅）的显微拉曼装置中时，LLF和NF的串联使得能够测量低至±20厘米⁻¹的拉曼信号。通过在800至990纳米激发波长下记录的一系列22个斯托克斯光谱和反斯托克斯光谱，在硫粉和块状单壁碳纳米管样品上证明了VBG拉曼系统的良好性能和快速可调谐性。该装置的主要缺点是光谱范围限于近红外以及滤波器的小角度接受度（约1毫弧度），这主要导致了NF的衰减问题。讨论了主要限制的影响并提供了解决方案。
