Trapezoidal structure based crystal optical electric field sensor

Abstract

The invention relates to a trapezoidal structure based crystal optical electric field sensor, belonging to the technical field of electric field measurement. The electric field sensor comprises a crystal, a polarizer and a polarization analyzer, wherein one end part of the crystal is trapezoidal while the other end part of the crystal is rectangular; the polarizer is stuck to a laser incidence place of the rectangular end part of the crystal; the polarization analyzer is stuck to a laser emission place of the rectangular end part of the crystal; and a top angle a of the trapezoidal end part of the crystal and optical polarization points of the electric field sensor satisfy a certain relationship. Three total reflection of the end face of the electro-optical crystal is utilized to generate optical polarization points, and a special trapezoidal top angle is selected to remove 1 / 4 wave plate of the optical polarization points, so that the trapezoidal structure based crystal optical electric field sensor, disclosed by the invention, has the advantages of simplifying a sensor structure and improving temperature stability of the sensor. The optical electric field sensor, disclosed by the invention, has the advantages of not only measuring the amplitude value of the electric field, but also measuring information such as frequency and phase position of the electric field, and is a time domain electric field sensor.

Description

technical field [0001] The invention relates to a crystal optical electric field sensor based on a trapezoidal structure, belonging to the technical field of electric field measurement. Background technique [0002] In the 1980s, with the development of optoelectronic technology, electrical companies in the United States, Japan, France and other countries conducted in-depth research on electric field sensors based on discrete optical components. The structure of this type of electric field sensor is as follows figure 1 As shown, it includes a polarizer 101 , a 1 / 4 wave plate 102 , an electro-optic crystal 103 and an analyzer 104 . The transfer function of the electric field measurement system can be expressed as [0003] [0004] Where E is the electric field to be measured, V out To measure the voltage signal output by the system, A represents the optical power loss and photoelectric conversion coefficient, b represents the extinction ratio of the sensor, k represents...

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Problems solved by technology

[0005] In order to make the sensor have linear input and output characteristics, it is necessary to make the sensor have an optical bias point of π / 2 Usually 1 / 4 wave plate is used to make However, the actual phase delay of the 1 / 4 wave plate is easily affected by factors such as ambient temperature, processing accuracy, and additional stress, and its fast and slow axes will also produce mismatching deviations during the alignment process with the electro-optic crystal, reducing the accuracy of measurement Spend

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