ELECTRONICALLY TUNABLE ACOUSTO-OPTIC FILTER HAVING SELECTED CRYSTAL ORIENTATION

A birefringent crystal is provided for an electronically tunable acousto-optic filter wherein a light beam is diffracted by a collinear acoustic wave in the birefringent crystal from a first polarization into an orthogonal polarization, the crystal orientation being such that the effect due to biref...

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Bibliographische Detailangaben
Hauptverfasser:	WILSON D,US, HAMMOND D,US, KUSTERS J,US
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:	A birefringent crystal is provided for an electronically tunable acousto-optic filter wherein a light beam is diffracted by a collinear acoustic wave in the birefringent crystal from a first polarization into an orthogonal polarization, the crystal orientation being such that the effect due to birefringence changes is balanced by the effect due to acoustic anisotropy, providing a filter with high resolution and large optical apertures. For a filter employing a quartz crystal, a crystal cut is utilized wherein the longitudinal axis of the filter medium lies along a crystal orientation of approximately (zyw) - 11.2 DEG ; for a lithium niobate crystal, the cut is (zyw) 4.0 DEG .