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1. (WO1991008602) VARIABLE FREQUENCY DYE LASER
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/008602 International Application No.: PCT/GB1990/001822
Publication Date: 13.06.1991 International Filing Date: 23.11.1990
Chapter 2 Demand Filed: 24.06.1991
IPC:
G02F 1/21 (2006.01) ,H01S 3/106 (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
01
for the control of the intensity, phase, polarisation or colour
21
by interference
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
Applicants:
THE SECRETARY OF STATE FOR DEFENCE IN HER BRITANNIC MAJESTY'S GOVERNMENT OF THE UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND [GB/GB]; Whitehall London SW1A 2HB, GB (AllExceptUS)
STAROMLYNSKA, Jacqueline [GB/AU]; AU (UsOnly)
Inventors:
STAROMLYNSKA, Jacqueline; AU
Agent:
BECKHAM, Robert, William; Ministry of Defence Patents 1A Room 2014, Empress State Building Lillie Road London SW6 1TR, GB
Priority Data:
8926539.124.11.1989GB
Title (EN) VARIABLE FREQUENCY DYE LASER
(FR) LASER A COLORANTS A FREQUENCE VARIABLE
Abstract:
(EN) The invention provides a variable frequency dye laser (1), where the tuning element within the cavity is a Fabry Perot etalon (2). The etalon cavity (12) contains a layer of nematic liquid crystal material or long pitch cholesteric material. The Fabry Perot etalon is constructed such that the liquid crystal material has a uniform tilt direction. Application of a gradually increasing voltage to the Fabry Perot etalon causes a gradual tilting of the liquid crystal director. As the liquid crystal director tilts this changes the refractive index of the liquid crystal material, and thus the selected wavelength (i.e. the wavelength allowed to traverse the dye laser cavity) changes.
(FR) Laser (1) à colorants à fréquence variable, dans lequel l'élément de syntonisation situé dans le logement est un étalon interférentiel de Pérot-Fabry (2). Le logement (12) de l'étalon possède une couche de matériau nématique à cristaux liquides ou de matériau cholestérique à pas allongé. L'étalon interférentiel de Pérot-Fabry est construit de telle sorte que le matériau à cristaux liquides ait un sens d'oscillation uniforme. Lorsqu'on augmente progressivement la tension de l'étalon interférentiel de Pérot-Fabry, cela provoque l'oscillation progressive de l'interpolateur à cristaux liquides. Lorsque l'interpolateur à cristaux liquides oscille cela entraîne le changement de l'indice de réfraction du matériau à cristaux liquides et cela entraîne par conséquent le changement de la longueur d'onde sélectionnée (par exemple la longueur d'onde autorisée pour traverser le logement du laser à colorant).
Designated States: CA, GB, JP, NO, US
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)