Current Optics and Photonics
Vol. 9 No. 2 (Apr. 2025)
한국광학회지
Vol. 36 No. 2(Apr. 2025)
K-Light
vol. 8 no. 2(Apr. 2025)
한국광학회 공식 SNS 계정 바로가기
트위터
인스타그램
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[하이라이트 논문] 한국광학회지 Vol. 36 No. 2 (2025 April)
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.
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.
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[Editor's Pick] Current Optics and Photonics Vol. 9 no. 2 (2025 April)
High-harmonic Generation in van der Waals Two-dimensional Materials
Dasol Kim, Alexis Chacon, and Jonghwan Kim*
Current Optics and Photonics Vol. 9 No. 2 (2025 April), pp. 95-107
DOI: https://doi.org/10.3807/COPP.2025.9.2.95
Fig. 1 Schematics of high-harmonic generation in van der Waals (vdW) 2D materials:
(a) Commonly used vdW 2D materials. (b) Experimental configuration of high-harmonic-generation measurement.
Keywords: High energy photon sources, High harmonic generation, Solid state physics, Strong-field, light-matter interaction, van der Waals 2D materials
OCIS codes: (040.7480) X-rays, soft X-rays, extreme ultraviolet (EUV); (140.0140) Lasers and laser optics; (160.4330) Nonlinear optical materials; (190.0190) Nonlinear optics; (320.0320) Ultrafast optics
Abstract
High-harmonic generation (HHG) in gases has long enabled tabletop access to coherent extreme ultraviolet (XUV) and soft X-ray radiation. More recently HHG has been extended to the solid-state realm, offering potential advantages such as higher conversion efficiency, tunability via band-structure engineering, and integration with photonic devices. Among emerging solid-state platforms, van der Waals (vdW) two-dimensional (2D) materials—e.g., graphene, transition-metal dichalcogenides (TMDs), and black phosphorus—exhibit pronounced quantum confinement, strong excitonic effects, and valleyselective dynamics. These properties yield unique HHG signatures, including polarization dependence, extended harmonic orders, and topological effects. This review summarizes fundamental mechanisms of HHG in vdW 2D materials, key experimental breakthroughs, and state-of-the-art theoretical approaches. We discuss exciton-driven enhancements, Berry-curvature-induced polarization, and device-integration challenges. We also highlight prospective directions, such as advanced ultrafast spectroscopy and applications in attosecond science, underscoring the rich opportunities and persistent challenges in harnessing strong-field light-matter interactions in 2D quantum materials.
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