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1. (WO1997015863) OPTICAL DEVICE
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1997/015863 International Application No.: PCT/JP1996/003149
Publication Date: 01.05.1997 International Filing Date: 28.10.1996
Chapter 2 Demand Filed: 08.05.1997
IPC:
G02F 1/35 (2006.01) ,G02F 1/355 (2006.01) ,H01S 3/06 (2006.01) ,H01S 3/108 (2006.01) ,H01S 3/109 (2006.01) ,H01S 3/115 (2006.01)
G PHYSICS
02
OPTICS
F
DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
1
Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
35
Non-linear optics
G PHYSICS
02
OPTICS
F
DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
1
Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
35
Non-linear optics
355
characterised by the materials used
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
S
DEVICES USING STIMULATED EMISSION
3
Lasers, i.e. devices for generation, amplification, modulation, demodulation, or frequency-changing, using stimulated emission, of infra-red, visible, or ultra-violet waves
05
Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
06
Construction or shape of active medium
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
S
DEVICES USING STIMULATED EMISSION
3
Lasers, i.e. devices for generation, amplification, modulation, demodulation, or frequency-changing, using stimulated emission, of infra-red, visible, or ultra-violet waves
10
Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
106
by controlling a device placed within the cavity
108
using a non-linear optical device, e.g. exhibiting Brillouin- or Raman-scattering
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
S
DEVICES USING STIMULATED EMISSION
3
Lasers, i.e. devices for generation, amplification, modulation, demodulation, or frequency-changing, using stimulated emission, of infra-red, visible, or ultra-violet waves
10
Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
106
by controlling a device placed within the cavity
108
using a non-linear optical device, e.g. exhibiting Brillouin- or Raman-scattering
109
Frequency multiplying, e.g. harmonic generation
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
S
DEVICES USING STIMULATED EMISSION
3
Lasers, i.e. devices for generation, amplification, modulation, demodulation, or frequency-changing, using stimulated emission, of infra-red, visible, or ultra-violet waves
10
Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
11
in which the quality factor of the optical resonator is rapidly changed, i.e. giant-pulse technique
115
using an electro-optical device
Applicants:
MITSUBISHI CABLE INDUSTRIES, LTD. [JP/JP]; 8, Nishinocho Higashimukaijima Amagasaki-shi Hyogo 660, JP (AllExceptUS)
ITO, Hiromasa [JP/JP]; JP
Inventors:
ITO, Hiromasa; JP
Agent:
TAKASHIMA, Hajime; Yuki Building 3-9, Hiranomachi 3-chome Chuo-ku Osaka-shi Osaka 541, JP
Priority Data:
7/30206326.10.1995JP
Title (EN) OPTICAL DEVICE
(FR) APPAREIL OPTIQUE
Abstract:
(EN) An optical device of this invention is such that complicated adjustment of the arrangement is not needed unlike a conventional optical device for outputting light having a frequency different from that of the input light by means of a nonlinear optical crystal. Electrodes (12A and 12B) for Q-switching, electrodes (9A and 9B) for phase adjustment and a periodical domain inversion portion (15) are disposed at predetermined positions in path (2) inside an optical crystal body (1) having nonlinear optical properties, electro-optical properties and laser activity. Oscillation light (P1) is produced by inputting light (P0) given from the input side (3), and output light (P2) having a frequency different from the frequency of the input light (P0) is outputted from the output side (4) by the nonlinear optical property and by the generation of harmonic or by optical parametric oscillation by use of the periodical domain inversion portion (15). The refractive index of the part of nonlinear crystal body (1) between the phase adjustment electrodes (9A and 9B) is changed by changing the voltage between the electrodes (9A and 9B), and the frequency of resonance over the full length (Lt) of the path (2) is thus adjusted. The Q-switching of oscillation light (P) is conducted by changing the refractive index of an oblique crossing portion of the oblique side (G) of the electrode (12A) and the path (2) by changing the voltage between the Q switch electrodes (12A and 12B).
(FR) La présente invention concerne un appareil optique conçu de telle manière qu'un réglage compliqué du montage ne soit pas nécessaire, contrairement à ce qui est le cas pour un appareil optique classique servant à fournir une lumière de fréquence différente de celle de la lumière arrivant à l'entrée, au moyen d'un cristal optique non linéaire. Les électrodes (12A et 12B) servant à la commutation de Q, les électrodes (9A) et (9B) de réglage de la phase, et une partie (15) à inversion périodique du domaine sont disposées à des emplacements déterminés, sur un parcours (2), à l'intérieur d'un cristal optique (1) ayant des propriétés optiques, des propriétés électro-optiques et une activité laser non linéaires. On obtient la lumière d'oscillation (P1) en fournissant en entrée de la lumière (P0) provenant du côté entrée (3), et la lumière de sortie (P2), d'une fréquence différente de celle de la lumière à l'entrée (P0), est fournie côté sortie (4) grâce aux propriétés optiques non linéaires et par la génération d'harmoniques, ou par oscillations paramétriques optiques, grâce à l'utilisation de la partie (15) d'inversion du domaine périodique. L'indice de réfraction de la partie du cristal non linéaire (1) qui est comprise entre les électrodes de réglage de phase (9A et 9B) est modifié par une modification de la tension appliquée à ces électrodes, la fréquence de résonance sur toute la longueur (Lt) du parcours (2) étant ainsi réglée. La commutation de Q de la lumière d'oscillation (P) s'effectue par changement de l'indice de réfraction d'une partie traversant en oblique du côté oblique (G) de l'électrode (12A) et le parcours (2) par changement de la tension appliquée aux électrodes (12A) et (12B) de commutation de Q.
Designated States: CN, KR, RU, US
European Patent Office (AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)
Also published as:
EP0878881US6175578