Identification of illicit street drugs with swept?source Raman spectroscopy

The identification of the illicit substances in low-purity seized drugs with Raman spectroscopy is an outstanding problem. low concentration target molecule demands high sensitivity and presence impurities produces a strong fluorescence background that makes challenging. Although analyzers 785 830 nm excitation wavelengths provide sensitivity, longer 1064 wavelength lower fluorescence. In this work, we demonstrate spectrometer simultaneously achieves both We utilize swept-source which replaced by single high-collection spectral channel, spectrum swept using tunable laser. By eliminating its slit, optical throughput are improved. Moreover, our system requires uncooled silicon photodiode provides higher quantum efficiency at compared CCDs. This allowed us to use 900 range reduce without sacrificing sensitivity. have demonstrated 6x reduction colored excitation. With could identify heroin only 1% purity sample. Besides forensics security, approach can be powerful technique biomedical applications where limits detection capabilities.