Abnormal broadband acousto-optic deflection device

Abstract

The invention discloses an abnormal broadband acousto-optic deflection device. An acousto-optic medium is arranged inside a base; a lower electrode layer, a bonding layer and an upper electrode layer are arranged on the sound transmission surface of the acousto-optic medium; an energy converter is arranged on the upper electrode layer; the energy converter is provided with a first surface electrode and a second surface electrode. The acousto-optic medium is a gallium phoshpide crystal, an included angle beta between the direction of the sound transmission surface of the acousto-optic medium and the axis of the gallium phoshpide crystal [001] is smaller than 5 degree, and the optical axis is vertical to the light incoming surface; the energy converter is made of X cutting type lithium niobate crystal for stimulating transverse waves, and the thickness of the energy converter is 1.4-1.6 microns; a correction included angel theta is formed between the light incoming surface and the light outgoing surface of the acousto-optic medium, and the correction included angel theta enables diffracted light to be symmetrical about the optical axis in a working frequency range. According to the abnormal broadband acousto-optic defection device, the scanning angle of the diffracted light is increased, the diffraction efficiency is improved, and the volume of a signal processing system is greatly reduced.

Description

technical field [0001] The invention relates to the structural improvement of an acousto-optic deflector, in particular to a large-bandwidth acousto-optic deflector for signal processing, and belongs to the technical field of optical devices. Background technique [0002] Large-bandwidth acousto-optic deflectors have been widely used in signal processing systems, such as acousto-optic channelized receivers. They are key components in signal processing systems. They can quickly load electrical signals onto diffracted light. The frequency of the electrical signal is proportional to the size. The higher the frequency of the electrical signal, the larger the angle of the diffracted light. The stronger the electrical signal, the greater the intensity of the diffracted light. Commonly used large-bandwidth acousto-optic deflectors (bandwidth greater than 500MHz) are designed with longitudinal waves. The reason is that the thickness of the transducer of the longitudinal-wave acous...

AI Technical Summary

Problems solved by technology

Commonly used large-bandwidth acousto-optic deflectors (bandwidth greater than 500MHz) are designed with longitudinal waves. The reason is that the thickness of the transducer of the longitudinal-wave acousto-optic deflector is large and the manufacturing difficulty is low. However, the sound velocity of the longitudinal-wave acousto-optic deflector is high. , the diffracted light angle is small, it is difficult to meet the needs of some high-performance signal processing systems

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