Spectrometer Design for an 840 nm Spectral Domain Optical Coherence Tomography System

Lakshmi Parvathi M.; Abira Bright B.; Vani Damodaran

Authors

Lakshmi Parvathi M. SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu, India
Abira Bright B. SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu, India
Vani Damodaran SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu, India

Keywords:

spectrometer, Zemax simulation, transmission type grating, reflective type grating

Abstract

In this paper, the design and performance of a custom-built spectrometer for Spectral Domain Optical Coherence Tomography (SD-OCT) imaging for a near-infrared wavelength range centered around 840 nm is presented. Two configurations of spectrometers based on reflective and transmission type grating and achromatic doublet lens were analyzed and the spectrometer performance characteristics are studied. The spectrometer is designed to work best with a light source whose wavelength is 840 ± 46 nm. A line scan camera captures multiple wavelengths simultaneously. In order to achieve higher resolution and imaging depth, a 2048-pixel array linear line scan camera from Basler was chosen. The line scan camera’s detector has a length and width of 14.3 mm and 7 μm, respectively. The spectrometer design was simulated using Zemax software and the design parameters are described in this paper.

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