게시판 최근논문

[하이라이트 논문] 한국광학회지 Vol. 36 No. 2 (2025 April)

사무국 hit 122 date 2025-04-25

Wavelength-swept Source-based Wide Line-field Optical Coherence Tomography System
파장가변광원 기반 광폭 선형영역 광결맞음 단층영상 시스템

이승석ㆍ마혜준ㆍ김현성ㆍ최은서†

 


 

한국광학회지  Vol. 36 No. 2  (2025 April), pp. 85-93
DOI: https://doi.org/10.3807/KJOP.2025.36.2.085

 


 

Fig. 1  Lab-built wavelength-swept light source. The light source comprises two semiconductor optical amplifiers (SOAs), two isolators, a Fabry-Perot (FP) filter, and an output coupler. SOA2 is employed to amplify the output power emitted from the ring cavity.

Fig. 1  Lab-built wavelength-swept light source. The light source comprises two semiconductor optical amplifiers (SOAs), two isolators, a Fabry-Perot (FP) filter,
and an output coupler. SOA2 is employed to amplify the output power emitted from the ring cavity.

 

 

Keywords: 대면적, 비주사, 광단층촬영법, 파장가변광원, 광폭 선형영역
OCIS codes: (100.6950) Tomographic image processing; (110.3175) Interferometric imaging; (120.3180) Interferometry

 

 

초록
본 논문에서는 전수검사에 활용하기 위해 개발된 line-field optical coherence tomography (LF-OCT) 시스템의 성능을 제시하였다. 광섬유 고리 공진기와 파장가변필터를 이용한 파장가변광원은 중심파장 1330 nm, 파장 반치폭 80 nm, 출력 광세기 90 mW의 특성을 보이며 100 Hz의 반복률로 동작하였다. 총 3장의 렌즈로 구성된 광폭 스캔 렌즈는 폭 100 mm 이하, 200 mm 길이의 선형빔을 발생시킬 수 있었 다. 파장가변광원과 절반 크기로 가공된 광폭 스캔 렌즈를 가지고 마이켈슨 간섭계 형태로 구현된 LF-OCT 시스템은 20 mm의 깊이 분해능과


Abstract
This paper presents the performance of a line-field optical coherence tomography (LF-OCT) system developed for full inspection. A wavelengthswept light source using a fiber ring resonator and a wavelength-tunable filter was operated at a repetition rate of 100 Hz with a center wavelength of 1330 nm, a spectral bandwidth of 80 nm, and an output power of 90 mW. The wide scan lens, designed in three lenses, could generate a line-field beam less than 100 mm wide and 200 mm long. The LF-OCT system implemented in a Michelson interferometer with a wavelength-swept light source and a wide-scan lens fabricated to half its dimension presented an axial resolution of 20 mm and a depth range of 2.84 mm at 3 dB. We could confirm 3 mm imaging depth through gauge block imaging and obtain 100-mm-wide tomographic images of a metal ruler without scanning. By optimizing the implemented LF-OCT, we will be able to demonstrate its utility as an inspection device for real-time, full-scale inspections required in industrial fields.