Raman spectroscopy is highly specific to chemical composition and so is well suited for distinguishing authentic vs. counterfeit products. A common challenge of traditional handheld Raman instruments using 785nm excitation is fluorescence interference. The higher excitation wavelength of the handheld Rigaku Progeny 1064nm analyzer minimizes this signal blocking fluorescence. To demonstrate this advantage, a green gel cap of an over the counter (OTC) headache relief medication was measured with a handheld Raman analyzer using 785nm and Progeny, using 1064nm excitation. As seen in Figure 1, the 785nm excitation shows a broad curve which is from fluorescence and obscures any material specific Raman peaks. However, the 1064nm excitation of Progeny clearly shows specific Raman peaks that can be used to identify an authentic material
Figure 1. 785nm excitation and 1064nm excitation Raman spectra from a green capsule of over the counter headache relief medication.