Design Simulation of Czerny–Turner Configuration-Based Raman Spectrometer Using Physical Optics Propagation Algorithm

Muddasir Naeem,Noor-Ul-Ain Fatima,Arshad Saleem Bhatti,Tayyab Imran,Mukhtar Hussain

doi:10.3390/opt3010001

Abstract

We report the design simulation of the Raman spectrometer using Zemax optical system design software. 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 modeling approach is suggested by introducing the corresponding relationship between detector pixels and wavelength, linear CCD receiving surface length and image surface dimension. The simulations were carried out using the POP (physical optics propagation) algorithm. Spot diagram, relative illumination, irradiance plot, modulation transfer function (MTF), geometric and encircled energy were simulated for designing the Raman spectrometer. The simulation results of the Raman spectrometer using a 527 nm wavelength laser as an excitation light source are presented. The present optical system was designed in sequential mode and a Raman spectrum was observed from 530 nm to 630 nm. The analysis shows that the system’s image efficiency was quite good, predicting that it could build an efficient and cost-effective Raman spectrometer for optical diagnostics.

Highlights

Spectrometry is a general term used for analyzing the specific spectrum and employed for the analysis of materials
Shows how the spatial frequency content of the entity is correctly transferred to the image and describes the performance of the optical system
The Raman spectrometer utilizing diffraction grating incorporates the standard Czerny–Turner system features with the flat-field grating spectrometer system

Summary

Introduction

Spectrometry is a general term used for analyzing the specific spectrum and employed for the analysis of materials. Raman spectrometry [1] is used to study molecular structures, identify molecules in unknown samples and give spectral information [2]. Jin. Xinghuan et al designed the modern grating-based Raman spectrometer. The spectral resolution, wavelength range and the simple spectrometer’s structural parameters are the contemporary way of thinking geometrical models [3]. Different designs of the Raman spectrometer have been published. Wang et al designed a crossed Czerny–Turner spectrometer using convergent illumination of the grating for the fluorescence spectrum of the organic particles [4]. Yinchao Zhang and Chen Wang proposed a double-grating monochromator with a different fiber arrangement [5].

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Conclusion