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KTa1-xNbxO3 (KTN) crystal quadratic electro-optical effect-based laser deflection modulation method

A secondary electro-optic and crystal technology, applied in optics, nonlinear optics, instruments, etc., can solve the problems of increasing the number of electrodes, demanding requirements, inconvenient device design, etc., and achieve the effect of simple sample production and favorable device design

Active Publication Date: 2014-07-16
山东山科智晶光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, although the KTN crystal electro-optical scanning technology has significant advantages in deflection efficiency and response time, the deflection of the laser in the prior art is along the direction of the electric field, and the laser can only achieve one-dimensional deflection under parallel planar electrodes, that is, longitudinal Scanning, in order to obtain multi-dimensional scanning, it is necessary to increase the number of electrodes. In addition, the existing electro-optic scanning technology has strict requirements on electrode materials, generally requires the use of titanium electrodes, and the manufacturing method is relatively complicated, which brings great inconvenience to device design.

Method used

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  • KTa1-xNbxO3 (KTN) crystal quadratic electro-optical effect-based laser deflection modulation method
  • KTa1-xNbxO3 (KTN) crystal quadratic electro-optical effect-based laser deflection modulation method
  • KTa1-xNbxO3 (KTN) crystal quadratic electro-optical effect-based laser deflection modulation method

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Example 1: Cu:KTa 0.63 Nb 0.37 o 3 Crystal electro-optical deflection process

[0025] Such as figure 1 As shown, in this embodiment, we use KTN crystal doped with Cu ions 0.1wt%, Nb content x is 0.37 as the deflection element, the Curie point of the crystal is 20.5°C, and the crystal size a×b×c=3mm×2mm× 6mm, each crystal plane is perpendicular to the crystal axis direction, the metal electrode end face is (010) plane (3mm×6mm), the laser light source is single-biased 532nm green light and single-biased 633nm red light, the beam diameter is 1mm, and the light intensity is 1~2mW.

[0026] As shown in Figure 2, the electrode is designed to plate a 50±1nm thick titanium (Ti) metal film on the surface of the crystal (010) by ion sputtering, and then apply silver conductive glue on the surface of the film to enhance the conductivity of the electrode and prevent Ti nano The layer is oxidized; in this electrode design mode, the direction of the electric field E is parallel...

Embodiment 2

[0030] Example 2: Cu:KTa 0.6 Nb 0.4 o 3 Crystal electro-optical deflection process

[0031] In this embodiment, a KTN crystal doped with 0.2wt% Cu ions and a Nb content x of 0.4 is used as the deflection element. (010) surface (2mm×5mm); the electrode is designed to make a 1±0.1um thick aluminum film on the (010) crystal surface by vacuum evaporation, and then coat silver conductive glue on the aluminum film.

[0032] The crystal temperature was controlled at 46±0.2°C during deflection. Other deflection implementation processes are the same as in Embodiment 1. The deflection result of this implementation example is similar to that of Example 1, the difference is that the deflection value is significantly reduced, which is due to the smaller electrode area and light transmission distance, indicating that increasing the electrode area and increasing the light transmission distance can effectively enhance the deflection of the laser.

Embodiment 3

[0033] Example 3: Cu: KTa 0.67 Nb 0.33 o 3 Crystal electro-optical deflection process

[0034] In this embodiment, a KTN crystal doped with 0.5wt% Cu ions and 0.33 Nb composition is used as the deflection element. The Curie point of the crystal is 4.5°C. Perpendicular to the direction of the crystal axis, the end face of the electrode is a (010) plane (3mm×7mm), and the electrode is made by coating a conductive glue on a 50nm ion-sputtered Pt film. The crystal temperature was controlled at 6±0.2°C during deflection. The implementation process of the deflection is the same as that of Embodiment 1.

[0035] The deflection result of this implementation example is similar to that of Example 1. Because the electrode end face and light transmission distance are increased, and the crystal thickness is reduced, the deflection efficiency of the crystal is improved.

[0036] In the present invention, we only use the KTN crystal doped with copper ions to realize the lateral scanning...

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Abstract

The invention discloses a KTa1-xNbxO3 (KTN) crystal quadratic electro-optical effect-based laser deflection modulation method, and belongs to the field of researches on the design and preparation of electro-optical components. The continuous unmechanical scanning of a laser beam in a direction perpendicular to the direction of an electric field within kilovolt direct current voltage is realized by simple components and a simple experimental design on the basis of the quadratic electro-optical effect of cubic phase Cu:KTN crystals doped with ions at certain concentration. The laser beam is deflected on the basis of accurate temperature control through a proper electrode design and a proper modulation way by taking cuboidal block KTN crystals which are different in component, doping concentration and machining size and opposite to crystal axes as deflection components, and deflection efficiency is as high as 120mrad / kV. The method has the remarkable characteristics that the transverse deflection of a laser propagation direction perpendicular to the direction of the electric field is realized; a device is easy to design; a deflection mode is unique; and the deflection efficiency reaches an advanced world standard.

Description

technical field [0001] The invention belongs to the research field of design and preparation of electro-optic components, and relates to the use of electro-optical functional crystal material potassium tantalum niobate (KTa 1-x Nb x o 3 , Abbreviation: KTN) The secondary electro-optic effect realizes the continuous non-mechanical deflection modulation of the laser beam. Background technique [0002] The electro-optic effect is a phenomenon in which the refractive index of the medium changes under the action of an external electric field. The phase, intensity and propagation direction of light can be modulated by using the electro-optic effect of crystal materials. Electro-optic modulation technology is due to its high efficiency, fast response and non-mechanical properties. (No inertia) and other advantages, usually used to make laser modulators, scanners and optical switches and other devices, widely used in laser radar, laser ranging, biomedical microscopic imaging and o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/03
Inventor 王旭平刘冰王继扬
Owner 山东山科智晶光电科技有限公司
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