  We report the design simulation of the Raman spectrometer using optical
system design software Zemax. The design is based on the Czerny-turner
configuration which includes an optical system consisting of an entrance slit,
two concave mirrors, reflecting type diffraction grating, and an image
detector. The system's modelling approach is suggested by introducing the
corresponding relationship between detector pixels and wavelength, linear CCD
receiving surface length, and image surface dimension. Simulations have been
carried out using the POP (Physical Optics Propagation) algorithm. Spot
diagram, relative illumination, irradiance plot, Modulation Transfer Function
(MTF), geometric, and encircled energy simulated for designing the Raman
spectrometer. The simulation results of the Raman spectrometer's using a 527 nm
wavelength laser as an excitation light source are presented. The present
optical system is designed in sequential mode and a Raman spectrum observed in
the range of 530 to 630 nm. The analysis shows that the system's image
efficiency is higher, predicting that it is possible to build an efficient and
cost-effective Raman spectrometer for optical diagnostics.
