Raising the interest in remote chemical analysis, in particular through Raman and fluorescence spectroscopy, the opportunity of increasing the exposure represents an important step for an easier and more reliable spectrum analysis. However, the European directive 2006/25/EC defines the maximum permitted exposure (MPE) to artificial radiations according to exposure duration, wavelength, coherence of the radiation and beam divergence. Though the Raman cross section scales in general according to the fourth power of the excitation wavelength, promoting the use of deep UV radiation, a synergy between wavelength and exposure time can raise the Raman signal in the near UV or in the near IR if compliance to eye-safety directives is requested. In this work we will analyze the possibilities offered by commercially available components for enhancing the Raman scattering under eye-safe conditions.

中文翻译：

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人眼安全拉曼光谱仪的激光波长，功率和脉冲持续时间的优化

尤其是通过拉曼光谱和荧光光谱法引起了对远程化学分析的兴趣，增加曝光量的机会代表了更简单，更可靠的光谱分析的重要一步。但是，欧洲指令2006/25 / EC根据暴露持续时间，波长，辐射的相干性和光束发散度来定义对人造辐射的最大允许暴露（MPE）。尽管拉曼截面通常根据激发波长的四次方缩放，从而促进了深紫外辐射的使用，但如果波长与曝光时间保持一致，则可以在近紫外或近红外条件下提高拉曼信号。要求眼睛安全指令。