SECONDARY HIGHER HARMONIC GENERATOR AND PICKUP FOR OPTICAL RECORDING MEDIUM

PURPOSE:To improve the efficiency of conversion from omega light to 2omega light by generating and emitting 2omega light from a nonlinear optical material only in one direction, to miniaturize a device and to reduce the cost of the device by eliminating the need for a large-sized, expensive optical...

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Bibliographische Detailangaben
1. Verfasser:	FUJINO YOUSUKE
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS 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 DEVICES USING STIMULATED EMISSION ELECTRICITY FREQUENCY-CHANGING INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	PURPOSE:To improve the efficiency of conversion from omega light to 2omega light by generating and emitting 2omega light from a nonlinear optical material only in one direction, to miniaturize a device and to reduce the cost of the device by eliminating the need for a large-sized, expensive optical isolator such as a Faraday rotator interposed conventionally between a light source for a fundamental wave and an external resonator. CONSTITUTION:The crystal axes of two lambda/4 plates 9A and 9B arranged in the external resonator by holding KNbO3 crystal 10 therebetween are slanted at 45 deg. to the polarizing direction of the omega light and then the polarization states of the omega light in the external resonator on its going and return ways intersects orthogonally with each other. The phase matching of the KNbO3 crystal 10 is realized only when the polarizing direction of the omega light is parallel to the crystal axis (b) and the 2omega light is emitted in a forwarding direction at this time. The 2omega light is not generated in the opposite returning way direction and the efficiency of conversion from the omega light to the 2omega light is improved.