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1. WO1989000301 - OPTICAL SECOND HARMONIC GENERATION

Publication Number WO/1989/000301
Publication Date 12.01.1989
International Application No. PCT/GB1988/000504
International Filing Date 27.06.1988
IPC
G02F 1/377 2006.1
GPHYSICS
02OPTICS
FDEVICES 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
1Devices 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
35Non-linear optics
37for second-harmonic generation
377in an optical waveguide structure
G02F 1/383 2006.1
GPHYSICS
02OPTICS
FDEVICES 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
1Devices 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
35Non-linear optics
37for second-harmonic generation
377in an optical waveguide structure
383of the optical fibre type
CPC
G02F 1/377
GPHYSICS
02OPTICS
FDEVICES 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
1Devices 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
35Non-linear optics
37for second-harmonic generation
377in an optical waveguide structure
G02F 1/383
GPHYSICS
02OPTICS
FDEVICES 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
1Devices 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
35Non-linear optics
37for second-harmonic generation
377in an optical waveguide structure
383of the optical fibre type
Applicants
  • BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY [GB]/[GB] (AllExceptUS)
  • WHITE, Kenneth, Ian [GB]/[GB] (UsOnly)
Inventors
  • WHITE, Kenneth, Ian
Agents
  • GREENWOOD, John, David
Priority Data
871536130.06.1987GB
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) OPTICAL SECOND HARMONIC GENERATION
(FR) GENERATION DE DEUXIEME HARMONIQUE OPTIQUE
Abstract
(EN) Most semiconductor lasers and LEDs emit light in the red and near-IR regions. However many applications require light at wavelengths extending into the blue and near-UV. One method of providing light at these wavelengths is to use the process of second harmonic generation in non-linear optical materials. Such an optical second harmonic generator arranged to couple light from a fundamental guided mode into a second harmonic radiation mode has an overlap parameter IN greater than 0.1. The overlap parameter IN is related to the measured efficiency $g(h) of the second harmonic generation by the equation $g(h) = P(2$g(v))(L)/P($g(v))(0) = $g(h)m x [neL/$g(l)($g(v))] x IN2, where $g(h)m is the efficiency characteristic of the non-linear material (formally defined in the detailed theoretical discussion below), ne is the effective refractive index of the device for the modes coupled, L is the length of the device, P2$g(v)(L) the output power for a device of length L and P$g(v)(0) the initial pump power at the fundamental frequency.
(FR) La plupart des lasers et des DEL à semi-conducteurs émettent de la lumière se trouvant dans les domaines du rouge et proches de l'infrarouge. Toutefois, de nombreuses applications requièrent une lumière à des longueurs d'ondes s'étendant dans le bleu et proches de l'ultraviolet. Un procédé offrant une lumière à ces longueurs d'ondes consiste à utiliser le procédé de génération de deuxième harmonique dans des matériaux optiques non linéaires. Un tel générateur de deuxième harmonique optique, agencé pour coupler la lumière à partir d'un mode guidé fondamental en un mode rayonnement de deuxième harmonique, a un paramètre de chevauchement IN supérieur à 0,1. Le paramètre de chevauchement IN est apparenté au rendement mesuré $g(h) de la génération de deuxième harmonique par l'équation: $g(h) = P(2$g(v))(L)/P($g(v))(0) = $g(h)m x [neL/$g(l)($g(v))] x IN2 dans laquelle $g(h)m représente la caractéristique de rendement du matériau non linéaire (formellement définie dans l'étude théorique détaillée ci-après), ne représente l'indice de réfraction réel du dispositif pour les modes couplés, L représente la longueur du dispositif, P2$g(v)(L) la puissance de sortie pour un dispositif de longueur L et P$g(v)(0) la puissance de pompage initiale à la fréquence fondamentale.
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