Optical filters

An optical interference filter 2 is provided by a substrate 1 in which is formed a plurality of parallel slots so as to define layers (slots and substrate laminae) of alternating refractive index. As shown, the filter comprises a central Fabry-Perot resonator slot cavity 3 between two mirror groups...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	MCNIE, MARK EDWARD, LEWIS, KEITH LODER, SMITH, GILBERT WILLIAM
Format:	Patent
Sprache:	eng
Schlagworte:	DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING FREQUENCY-CHANGING NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	An optical interference filter 2 is provided by a substrate 1 in which is formed a plurality of parallel slots so as to define layers (slots and substrate laminae) of alternating refractive index. As shown, the filter comprises a central Fabry-Perot resonator slot cavity 3 between two mirror groups 4, 5 of alternating slots and substrate laminae, and is coupled to optical fibres 7 accommodated in V-grooves 6 on either side. For tuning, one mirror group 5 may be movable in the direction of arrow A, or, where the central resonator is provided by substrate material, by altering its temperature. One or more further Fabry-Perot filters may be formed in the substrate and coupled to the filter 2. The invention encompasses non-resonating filters.