Design and validation of a linear wavenumber spectrometer for SD-OCT using freeform optics

Wenqi Li; Yuanhai Cai; Zhuolun Li; Hao Chen; Conglu Ji; Shanshan Liang; Jun Zhang

doi:10.1117/12.3039194

13 September 2024 Design and validation of a linear wavenumber spectrometer for SD-OCT using freeform optics

Wenqi Li, Yuanhai Cai, Zhuolun Li, Hao Chen, Conglu Ji, Shanshan Liang, Jun Zhang

Proceedings Volume 13254, Fourth International Conference on Optics and Image Processing (ICOIP 2024); 132540H (2024) https://doi.org/10.1117/12.3039194
Event: Fourth International Conference on Optics and Image Processing (ICOIP 2024), 2024, Chongqing, China

Abstract

In spectral domain optical coherence tomography (SD-OCT), spectrometers traditionally use gratings to disperse light, producing spectral signals linearly related to wavelength. However, this induces nonlinearity in wavenumber (k) space, diminishing the sensitivity of SD-OCT systems. Conventionally, signals are interpolated and resampled to achieve linear interferometric spectral signals in wavenumber space. Our work presents a spectrometer that inherently produces linear wavenumber signals, obviating the need for post-interpolation and thus enhancing system sensitivity while reducing processing time. This advancement is achieved by employing a spectrometer equipped with a freeform surface lens that dramatically reduces wavenumber nonlinearity from 1.49% to 0.0043%. We have successfully manufactured this lens and experimentally validated the spectrometer’s wavenumber linearity.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Wenqi Li, Yuanhai Cai, Zhuolun Li, Hao Chen, Conglu Ji, Shanshan Liang, and Jun Zhang "Design and validation of a linear wavenumber spectrometer for SD-OCT using freeform optics", Proc. SPIE 13254, Fourth International Conference on Optics and Image Processing (ICOIP 2024), 132540H (13 September 2024); https://doi.org/10.1117/12.3039194

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