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이응제,김용평 경희대학교 레이저공학연구소 2006 레이저공학 Vol.17 No.-
We demonstrate a wavelength swept mode-locked ring laser for the frequency domain optical coherence tomography. A laser is constructed by using a semiconductor optical amplifier, fiber Fabry-Perot tunable filter and 2.6 km fiber ring cavity. Mode-locking is implemented by 2.6 km fiber ring cavity for matching the fundamental or harmonic of cavity roundtrip time to a sweep period. The wavelength sweeps are repeatatively generated with the repetition period of 77.2 kHz which is the parallel resonance frequency of Fabry-Perot tunable filter. The wavelength tuning range of the laser is more than FWHM of 61 nm centered at the wavelength of 1320 nm and the linewidth of the source is 0.014±0.002 nn.
파장가변 광원 광 간섭 단층촬영 시스탬의 전압제어발진기를 이용한 선형화 방법
이응제,김용평 경희대학교 공학연구소 2009 레이저공학 Vol.20 No.-
We investigate beat signal recalibration method for the interferometer sensing system with high speed wavelength-swept source. Adopting a VCO( voltage controlled oscillator) output signal as reference of trigger, the broadening of the beat frequency due to the variance of wavelength-sweep-velocity is recalibrated. Compare with recalibration method with optics, this RF method shows superior repeatability
부스터 반도체 광 증폭기를 이용한 파장가변 광원의 출력특성 개선
이응제,김용평 慶熙大學校 레이저 工學硏究所 2007 레이저공학 Vol.18 No.-
We demonstrate a amplified wavelength-swept-source for the frequency domain optical coherence tomography. The laser output performance is improved by using a semiconductor optical amplifier with a booster amplifier which has a 1275nm of center wavelength, The laser generates 14 mW of average power and the wavelength tuning range of the laser is more than FWHM(full width half maximum) of 98 nm centered at the wavelength of 1320 nm.
주파수영역 광 간섭 단층촬영 시스템을 위한 파장가변 광원 및 신호처리계의 구현
이응제,김용평,Lee, Eung-Je,Kim, Yong-Pyung 한국광학회 2007 한국광학회지 Vol.18 No.5
주파수영역 광 간섭 단층촬영 시스템을 위한 파장가변 광원과 주파수 보정(calibration)을 위한 신호처리계를 구현하였다. 제작된 레이저의 평균출력을 부스터(booster) 반도체 광 증폭기를 이용하여 14 mW까지 증폭시키고, 레이저 스펙트럼의 편이(shift)를 보상하였다. 패브리-페롯 에탈론(Fabry-Perot etalon)과 디지털 신호처리(digital signal processing)로 신호처리계를 제작함으로서 파장가변광원의 속도가변에 따른 비트주파수(beat frequency)의 넓어짐을 보정하였다. 제작된 광 간섭 단층촬영 시스템은 종방향 주사속도 154.4 kHz, 측정깊이 0.95 mm, 종방향 분해능 $12{\pm}0.37{\mu}m$의 특성을 가진다. We demonstrate the wavelength swept source and signal processing for the frequency domain optical coherence tomography. The laser output performance is improved by using a semiconductor optical amplifier with a booster amplifier. The laser generates 14 mW of average power of which wavelength shift in the lasing spectral shape is compensated. Adopting a Fabry-Perot etalon and digital signal processing, the broadening of the beat frequency due to the variance of wavelength-sweep-velocity is calibrated. The optical coherence tomography system shows 154.4 kHz of axial scanning speed, 0.95mm of depth range, and $12{\pm}0.37{\mu}m$ of axial resolution.
파장 가변 광원 광간섭 단층촬영 시스템을 위한 영상 신호처리계 설계
이응제,김용평 경희대학교 공학연구소 2008 레이저공학 Vol.19 No.-
We investigate image signal processing for the swept-source optical coherence tomography(SS-OCT). Adopting a Fabry-Perot etalon and digital signal processing, the broadening of the beat frequency due to the variance of wavelength-sweep-velocity is calibrated. And we describe array operation scheme for the image generation. The optical coherence tomography system shows 1 image per 0.8 sec of frame rate.
이응제,이희철,김용평 慶熙大學校 레이저 工學硏究所 2003 레이저공학 Vol.14 No.-
We suggest the optimal conditions for fabricating solid state dye and analysed its lasing characteristics. It is measured and analysed the output characteristics of solid state dye laser in various conditions such as pumping repeatition rate, input energy, molar concentration, and the length of dyecell, etc. The conversion efficiency of 40 % was obtained in this lasing material.
광섬유 패브리-페로 파장가변 필터의 공진특성에 기반한 고속 파장가변 모드잠김 레이저의 제작
이응제(Eung-Je Lee),김용평(Yong-Pyung Kim) 대한전기학회 2009 전기학회논문지 Vol.58 No.7
A high-speed wavelength swept laser, which is based on oscillation characteristics of a fiber Fabry-Perot tunable filter, is described. The laser is constructed by using a semiconductor optical amplifier, a fiber Fabry-Perot tunable filter, and 3.348 ㎞ fiber ring cavity. The wavelength sweeps are repeatatively generated with the repetition period of 61 ㎑ which is the first parallel oscillation frequency of the Fabry-Perot tunable filter for the low power consumption. Mode-locking is implemented by 3.348 ㎞ fiber ring cavity for matching the fundamental of cavity roundtrip time to the sweep period. The wavelength tuning range of the laser is 87 ㎚(FWHM) and the average output power is 1.284 ㎽.
李應齊(Eung-Je Lee),金容平(Yong-Pyung Kim) 대한전기학회 2007 전기학회논문지 Vol.56 No.6
We demonstrate a wavelength swept mode-locked ring laser for the frequency domain optical coherence tomography(FD OCT). A laser is constructed by using a semiconductor optical amplifier, fiber Fabry-Perot tunable filter and 2.6 ㎞ fiber ring cavity. Mode-locking is implemented by 2.6 ㎞ fiber ring cavity for matching the fundamental or harmonic of cavity roundtrip time to a sweep period. The wavelength sweeps are repetitively generated with the repetition period of 77.2 ㎑ which is the parallel resonance frequency of Fabry-Perot tunable filter for the low driving current consumption of the fiber Fabry-Perot tunable filter. The wavelength tuning range of the laser is more than FWHM of 61 ㎚ centered at the wavelength of 1320 ㎚ and the linewidth of the source is 0.014±0.002 ㎚.