Design method of BGO crystal for optical waveguide electric field sensor

Abstract

The invention discloses a design method of a BGO crystal for an optical waveguide electric field sensor. The preparation method comprises the following steps: firstly, preparing a BGO cubic crystal from raw materials Bi2O3 and GeO2; cutting the BGO cubic crystal to obtain a BGO crystal with a standard size; then, carving two symmetrical optical waveguides in the BGO crystal by utilizing femtosecond laser; carving parallel grooves in the two sides of one optical waveguide through laser, and manufacturing Au metal electrodes in the grooves through an electron beam spraying method; and finally, using the active alignment technology to adjust the relative position of the assembly by detecting the coupled optical power, and matching and fixing an optical fiber and the end face of a crystal through refractive index matching type curing glue. The BGO crystal provided by the invention is high in purity and high in transmissivity, and measurement errors caused by the quality problem of the electro-optic crystal are greatly reduced.

Description

technical field [0001] The invention belongs to the field of BGO crystal cutting and processing, and in particular relates to a design method of a BGO crystal used in an optical waveguide field sensor. Background technique [0002] Optical electric field sensors have attracted more and more attention in the field of electric field measurement. Compared with traditional active electric field sensors, they have the advantages of small size, high precision, high sensitivity, large linear dynamic range, and wide frequency response. Optical electric field sensors It has broad application prospects and research value. Existing optical electric field sensors are mostly composed of a crystal optical path and an output light detection circuit. For the crystal optical path, the existing preparation methods will affect the optical characteristics of the electro-optic crystal, so as to reduce the measurement accuracy of the entire electric field sensor. [0003] BGO crystal has good el...

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Problems solved by technology

On the one hand, this kind of scheme uses a variety of optical devices, and the coupling between these optical devices will inevitably produce cumulative errors, and increase the volume and production cost of the sensor; on the other hand, the light inside the crystal is not affected by the crystal light. The guidance of the waveguide is easy to cause the problem of light divergence, resulting in the reduction of measurement accuracy

[0007] The optical electric field sensor has been extensively studied because of its good performance, but due to the influence of its structural design and manufacturing process, it will cause a certain degree of measurement error

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