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1. (WO1998052021) GRATING BASED PHASE CONTROL OPTICAL DELAY LINE
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1998/052021 International Application No.: PCT/US1998/009914
Publication Date: 19.11.1998 International Filing Date: 15.05.1998
Chapter 2 Demand Filed: 14.12.1998
IPC:
A61B 5/103 (2006.01) ,G01B 11/24 (2006.01) ,G01N 21/47 (2006.01) ,G02B 5/18 (2006.01) ,G02B 27/44 (2006.01) ,G11B 7/00 (2006.01)
A HUMAN NECESSITIES
61
MEDICAL OR VETERINARY SCIENCE; HYGIENE
B
DIAGNOSIS; SURGERY; IDENTIFICATION
5
Measuring for diagnostic purposes; Identification of persons
103
Measuring devices for testing the shape, pattern, size or movement of the body or parts thereof, for diagnostic purposes
G PHYSICS
01
MEASURING; TESTING
B
MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
11
Measuring arrangements characterised by the use of optical means
24
for measuring contours or curvatures
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21
Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible, or ultra-violet light
17
Systems in which incident light is modified in accordance with the properties of the material investigated
47
Scattering, i.e. diffuse reflection
G PHYSICS
02
OPTICS
B
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
5
Optical elements other than lenses
18
Diffracting gratings
G PHYSICS
02
OPTICS
B
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
27
Other optical systems; Other optical apparatus
42
Diffraction optics
44
Grating systems; Zone plate systems
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7
Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor
Applicants:
MASSACHUSETTS INSTITUTE OF TECHNOLOGY [US/US]; 77 Massachusetts Avenue Cambridge, MA 02139, US
Inventors:
TEARNEY, Guillermo, J.; US
BOUMA, Brett, E.; US
FUJIMOTO, James, G.; US
Agent:
TURANO, Thomas, A.; Testa, Hurwitz & Thibeault, LLP High Street Tower 125 High Street Boston, MA 02110, US
Priority Data:
60/046,73916.05.1997US
Title (EN) GRATING BASED PHASE CONTROL OPTICAL DELAY LINE
(FR) LIGNE DE RETARD OPTIQUE A COMMANDE DE PHASE DE RESEAU
Abstract:
(EN) An apparatus for performing high speed scanning of an optical delay and its application for performing optical interferometry, ranging, and imaging, including cross-sectional imaging using optical coherence tomography, is disclosed. The apparatus achieves optical delay scanning by using diffractive optical elements in conjunction with imaging optics. In one embodiment a diffraction grating disperses an optical beam into different spectral frequency or wavelength components which are collimated by a lens. A mirror is placed one focal length away from the lens and the alteration of the grating groove density, the grating input angle, the grating output angle, and/or the mirror tilt produce a change in optical group and phase delay. This apparatus permits the optical group and phase delay to be scanned by scanning the angle of the mirror. In other embodiments, this device permits optical delay scanning without the use of moving parts.
(FR) L'invention concerne un appareil permettant d'effectuer un balayage à grande vitesse d'un retard optique, et son application pour mettre en oeuvre des interférométries, des mesures et des visualisations par des moyens optiques, dont des visualisations en coupe transversale, à l'aide d'une tomographie à cohérence optique. L'appareil permet d'effectuer un balayage de retard optique à l'aide d'éléments optiques à diffraction utilisés conjointement avec un moyen de visualisation optique. Dans un mode de réalisation, un réseau de diffraction disperse un faisceau optique en composantes de différentes fréquences spectrales ou longueurs d'ondes, qui sont collimatées par une lentille. Un miroir est placé à une distance d'une longueur focale de la lentille, et la modification de densité de trait du réseau, l'angle d'entrée de réseau, l'angle de sortie de réseau, et/ou l'inclinaison du miroir produisent un changement dans le groupe optique et le retard de phase. L'appareil permet de détecter le groupe optique et le retard de phase par balayage de l'angle du miroir. Dans d'autres modes de réalisation, ce dispositif permet d'effectuer un balayage de retard optique sans employer d'éléments mobiles.
Designated States: CA, JP
European Patent Office (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0981733JP2001527659 CA2289598