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1. WO2012018195 - OPTICAL COHERENCE TOMOGRAPHY USING ACTIVE MODE-LOCKING FIBER LASER

Publication Number WO/2012/018195
Publication Date 09.02.2012
International Application No. PCT/KR2011/005571
International Filing Date 28.07.2011
IPC
G01B 9/02 2006.01
GPHYSICS
01MEASURING; TESTING
BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
9Instruments as specified in the subgroups and characterised by the use of optical measuring means
02Interferometers
G01N 21/17 2006.01
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
17Systems in which incident light is modified in accordance with the properties of the material investigated
CPC
G01B 9/02004
GPHYSICS
01MEASURING; TESTING
BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
9Instruments as specified in the subgroups and characterised by the use of optical measuring means
02Interferometers ; for determining dimensional properties of, or relations between, measurement objects
02001characterised by manipulating or generating specific radiation properties
02002Frequency variation
02004by using a continuous frequency sweep or scan
G01B 9/02091
GPHYSICS
01MEASURING; TESTING
BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
9Instruments as specified in the subgroups and characterised by the use of optical measuring means
02Interferometers ; for determining dimensional properties of, or relations between, measurement objects
02091Tomographic low coherence interferometers, e.g. optical coherence tomography
G01N 21/31
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
17Systems in which incident light is modified in accordance with the properties of the material investigated
25Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
31Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
G01N 21/4795
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
17Systems in which incident light is modified in accordance with the properties of the material investigated
47Scattering, i.e. diffuse reflection
4795spatially resolved investigating of object in scattering medium
H01S 3/067
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
06Construction or shape of active medium
063Waveguide lasers, ; i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
067Fibre lasers
H01S 3/06791
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
06Construction or shape of active medium
063Waveguide lasers, ; i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
067Fibre lasers
06791Fibre ring lasers
Applicants
  • 부산대학교 산학협력단 PUSAN NATIONAL UNIVERSITY INDUSTRY-UNIVERSITY COOPERATION FOUNDATION [KR]/[KR] (AllExceptUS)
  • 김창석 KIM, Chang Seok [KR]/[KR] (UsOnly)
  • 정명영 JEONG, Myung Yung [KR]/[KR] (UsOnly)
  • 이휘돈 LEE, Hwi Don [KR]/[KR] (UsOnly)
Inventors
  • 김창석 KIM, Chang Seok
  • 정명영 JEONG, Myung Yung
  • 이휘돈 LEE, Hwi Don
Agents
  • 오위환 OH, Wi-Hwan
Priority Data
10-2010-007526004.08.2010KR
Publication Language Korean (KO)
Filing Language Korean (KO)
Designated States
Title
(EN) OPTICAL COHERENCE TOMOGRAPHY USING ACTIVE MODE-LOCKING FIBER LASER
(FR) TOMOGRAPHIE À COHÉRENCE OPTIQUE UTILISANT UN LASER À FIBRE À VERROUILLAGE DE MODE ACTIF
(KO) 능동형 모드 잠김 레이저를 이용한 광 결맞음 단층 영상기기
Abstract
(EN)
An optical coherence tomography (OCT) uses an active mode-locking fiber laser in order to obtain image information of a sample. An imaging device of the present invention comprises: a light source unit that emits light having a central wavelength which is periodically changed by a modulation signal received from the inside of a resonator; a light separation unit that separates the light having a single path, which is emitted from the light source unit, into a first light and a second light having different paths; a reference unit that is disposed on a path through which the first light separated by the light separation unit progresses, and reflects said first light; a diagnostic unit that has a sample mounted thereon, is disposed on a path of the second light separated by the light separation unit, and the second light is delayed more than the first light for a certain time to reflect the delayed light; a light coupling unit that couples the first light and the second light, which are progressed in different paths through the reference unit and the diagnostic unit and in which mutual interference is generated therefrom; and a signal processing unit that detects and images data of the light received from the light coupling unit. Thus, since the imaging device of the present invention removes a high-priced variable filter which has mechanical restrictions by directly delivering a modulation signal to a light source unit, the invention can overcome mechanical restrictions and reduce costs.
(FR)
Une tomographie à cohérence optique (OCT) utilise un laser à fibre à verrouillage de mode actif pour obtenir des informations d'image d'un échantillon. Un dispositif d'imagerie d'après la présente invention comprend : une unité de source de lumière qui émet une lumière ayant une longueur d'onde centrale qui est modifiée périodiquement par un signal de modulation reçu de l'intérieur d'un résonateur ; une unité de séparation de lumière qui sépare la lumière suivant un seul trajet, qui est émise par l'unité de source de lumière, en des première et seconde lumières suivant des trajets différents ; une unité de référence située sur un trajet suivi par la première lumière séparée par l'unité de séparation de lumière et réfléchit ladite première lumière ; une unité de diagnostic sur laquelle est monté un échantillon et qui est située sur un trajet suivi par la seconde lumière séparée par l'unité de séparation de lumière et, pendant un certain temps, la seconde lumière est davantage retardée que la première de manière à réfléchir la lumière retardée ; une unité de couplage de lumière qui couple les première et seconde lumières, qui ont suivi des trajets différents, par l'intermédiaire de l'unité de référence et de l'unité de diagnostic et au sein de laquelle est produite une interférence réciproque à partir de celles-ci ; et une unité de traitement de signal qui détecte et projette en image des données de la lumière reçue de l'unité de couplage de lumière. Par conséquent, puisque le dispositif d'imagerie d'après la présente invention permet de supprimer un filtre variable qui est fort onéreux et qui présente des limites mécaniques du fait qu'il transmet directement un signal de modulation à une unité de source de lumière, l'invention permet de surmonter les limites mécaniques et de réduire les coûts.
(KO)
개시된 광 결맞음 단층 영상기기(optical coherence tomography, OCT)는 샘플의 영상 정보를 획득하기 위하여 능동형 모드 잠김 레이저(active mode-locking fiber laser)를 이용한다. 본 영상기기는 공진기 내부로 전달받은 변조(modulation) 신호에 의하여 중심 파장이 주기적으로 변하는 광을 방출하는 광원부, 광원부로부터 방출된 단일 경로의 광을 서로 다른 경로를 갖는 제1 광과 제2 광으로 분리하는 광 분리부, 광 분리부에 의하여 분리된 제1 광이 진행하는 경로에 배치되어 상기 제1 광을 반사시키는 기준부, 샘플을 실장하고, 광 분리부에 의하여 분리된 제2 광의 경로에 배치되어 제2 광을 제1 광보다 일정 시간 지연시켜 반사시키는 진단부, 기준부와 진단부를 통하여 서로 다른 경로로 진행되어 서로 간섭이 발생된 제1 광과 제2 광을 결합시키는 광 결합부, 및 광 결합부로부터 전달받은 광의 데이터를 검출하고 영상화하는 신호처리부를 포함한다. 따라서 본 영상기기는 변조 신호를 광원부에 직접 전달하여 기계적 한계를 가지고 고가인 가변 필터를 제거함으로써, 기계적 한계를 극복하고 비용을 절감할 수 있다.
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