Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Partial Spectrum Detection and Super-Gaussian Window Function for Ultrahigh-resolution Spectral-domain Optical Coherence Tomography with a Linear-k Spectrometer

  • Hyun-Ji, Lee (Safety Measurement Institute, Korea Research Institute of Standards and Science) ;
  • Sang-Won, Lee (Safety Measurement Institute, Korea Research Institute of Standards and Science)
  • Received : 2022.09.30
  • Accepted : 2022.12.19
  • Published : 2023.02.25
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Abstract

In this study, we demonstrate ultrahigh-resolution spectral-domain optical coherence tomography with a 200-kHz line rate using a superluminescent diode with a -3-dB bandwidth of 100 nm at 849 nm. To increase the line rate, a subset of the total number of camera pixels is used. In addition, a partial-spectrum detection method is used to obtain OCT images within an imaging depth of 2.1 mm while maintaining ultrahigh axial resolution. The partially detected spectrum has a flat-topped intensity profile, and side lobes occur after fast Fourier transformation. Consequently, we propose and apply the super-Gaussian window function as a new window function, to reduce the side lobes and obtain a result that is close to that of the axial-resolution condition with no window function applied. Upon application of the super-Gaussian window function, the result is close to the ultrahigh axial resolution of 4.2 ㎛ in air, corresponding to 3.1 ㎛ in tissue (n = 1.35).

Keywords

Acknowledgement

Development of Measurement Standards and Technology for Biomaterials and Medical Convergence, funded by the Korea Research Institute of Standards and Science (KRISS-GP2022-0006); Creative Materials Discovery Program (2018M3D1A1058814); Korea Medical Device Development Fund grants, funded by the Korean government (Ministry of Science and ICT, Ministry of Trade, Industry and Energy, Ministry of Health & Welfare, Ministry of Food and Drug Safety) (Project Number: KMDF_PR_20200901_0024 and KMDF_PR_20200901 _0026).

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