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Design and Optimization of a Linear Wavenumber Spectrometer with Cylindrical Optics for Line Scanning Optical
Sevin Samadi1, Javad Dargahi1, Sivakumar Narayanswamy1
1Department of Mechanical, Industrial and Aerospace Engineering (MIAE), Concordia University, Montreal, QC H3G 1M8, Canada.
Sensors (Basel, Switzerland)
|October 13, 2021
Summary
This study introduces a novel spectrometer design for high-speed line scanning optical coherence tomography (OCT). The innovative use of cylindrical optics linearizes k-space, significantly improving depth-dependent signal sensitivity and image quality for clinical applications.
Area of Science:
- Optical Engineering
- Biomedical Imaging
- Spectroscopy
Background:
- Spectral nonlinearity in k-space reduces depth-dependent signal sensitivity in spectrometers.
- Line scanning optical coherence tomography (OCT) requires specialized spectrometers utilizing cylindrical optics for faster imaging.
- Existing k-space linearization methods often require resampling, impacting imaging speed and quality.
Purpose of the Study:
- To design a high-efficiency spectral-domain spectrometer with cylindrical optics for line scanning OCT.
- To linearize the k-space of the spectrometer, thereby enhancing depth-dependent signal sensitivity.
- To achieve high-speed and high-sensitivity OCT imaging without the need for resampling.
Main Methods:
- Incorporation of grating and prism for k-space linearization.
- Utilization of a cylindrical mirror for line scanning acquisition.
- Optimization of the spectrometer design using MATLAB and ZEMAX simulations for a broadband light source (830 ± 100 nm).
Main Results:
- Significant reduction in nonlinearity error from 147.0115 to 0.0149 Δθ*μm within the specified wavenumber range.
- Implementation of reflective optics minimized chromatic aberration, enhancing image quality as indicated by the Strehl ratio (SR).
- The designed spectrometer enables high sensitivity and high-speed imaging without resampling.
Conclusions:
- The proposed spectrometer design effectively linearizes k-space using cylindrical optics for line scanning OCT.
- This advancement offers a powerful tool for real-time diagnosis, treatment, and surgical guidance with superior in-vivo image quality.
- The system addresses limitations of previous OCT spectrometers, paving the way for improved clinical diagnostics.
