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拉曼光谱检测常常受到荧光的干扰,影响了该技术的推广应用。移频激发差分拉曼光谱方法(SERDS方法)已被证明是一种有效的荧光抑制方法。SERDS实现荧光抑制的关键在于其特殊的激光光源,不仅要求其输出多个相近的波长,而且要求输出的激光功率较高、光谱线宽窄。采用Littrow光栅外腔半导体激光器原理设计实现了一种低成本、便携式的激光光源,可以在15nm的调谐范围内输出多个波长,光谱线宽小于0.2nm,输出功率可达80mW,适合用作移频激发差分拉曼光谱方法的多波长光源,实现拉曼光谱检测中对荧光干扰的抑制。
Raman spectroscopy often suffer from fluorescence interference, affecting the promotion and application of the technology. Frequency-shift excitation differential Raman spectroscopy (SERDS method) has been shown to be an effective fluorescence suppression method. The key of SERDS to achieve fluorescence suppression lies in its special laser light source, which not only requires the output of multiple similar wavelengths, but also requires higher output laser power and narrower spectral line width. The Littrow grating external cavity semiconductor laser principle is adopted to design and implement a low cost and portable laser light source capable of outputting multiple wavelengths within a tuning range of 15 nm. The spectral linewidth is less than 0.2 nm and the output power is up to 80 mW. Multi-wavelength light source with frequency-excited differential Raman spectroscopy to suppress the fluorescence interference in Raman spectrum detection.