Abstract
In this research, a homemade Raman Spectroscopy will be optimised using a laser with a wavelength of 532 nm. The calibration process will be conducted using computational method by DFT (Density Functional Theory) and comparisons with commercial Raman Spectroscopy at Bandung Institute of Technology hence we can compare the accuracy of the device. In the future, Raman spectroscopy can be used to detect molecules in saliva so that it can provide information about the presence of viruses such as COVID-19 in the saliva.