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Feel Like You’re Missing Raman Signal - 405 nm Can Help See More

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Feel Like You’re Missing Raman Signal - 405 nm Can Help See More

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  • Author: Mr Inoue, Dr Elizabeth Illy
A general challenge in Raman spectroscopy is that the inherently weak Raman signal is often hidden by the influence of fluorescence (Fig 1). In order to minimize the effects of fluorescence, lasers in the NIR (785 nm – 1064 nm) are often used. However, since the Raman scattering intensity is inversely proportional to the fourth power of the laser wavelength, longer NIR wavelengths have the disadvantage that the Raman scattering intensity decreases. In addition, since the sensitivity of silicon sensors decreases in the wavelength region >800 nm, an expensive InGaAs type sensor is required at these wavelengths and the device configuration can become more complicated.

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