Transverse wave acousto-optic devices using tellurium oxide as the acousto-optic medium

Abstract

The invention discloses a transverse wave acousto-optic device using tellurium oxide as the acousto-optic medium, comprising a surface electrode, a transducer, a bonding layer and an acousto-optic medium, the transducer is bonded to the surface of the acousto-optic medium through the bonding layer, The surface electrode is plated on the surface of the transducer; the acousto-optic medium is tellurium oxide crystal, the transducer is lithium niobate, and the included angle θ between the thickness direction of lithium niobate and the Y axis is 163±5°. Under the same process conditions, the present invention respectively uses X-cut lithium niobate and 163±5°Y-cut lithium niobate to make transverse wave acousto-optic devices on tellurium oxide crystals. Under the same temperature range, 163±5°Y-cut lithium niobate The cracks produced by lithium are about one-fifth of that of X-cut lithium niobate, which greatly improves the reliability of tellurium oxide transverse wave acousto-optic devices.

Description

technical field [0001] The invention relates to an acousto-optic device, especially a transverse-wave acousto-optic device such as a laser system, a wide-band acousto-optic tunable filter suitable for spectral imaging or spectral analysis, and an acousto-optic deflector. The acousto-optic device is based on tellurium oxide. An acousto-optic medium belongs to the technical field of acousto-optic instruments. [0002] Background technique [0003] Tellurium oxide crystal is an excellent acousto-optic interaction medium (acousto-optic medium), which can be used to make acousto-optic tunable filters, acousto-optic deflectors, acousto-optic modulators, acousto-optic Q switches and other acousto-optic devices . The acousto-optic device is mainly composed of a surface electrode, a transducer, a bonding layer, an acousto-optic interaction medium, a matching network, and a high-frequency socket. The high-frequency socket is connected to the matching network through lead wires, the...

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Problems solved by technology

The electromechanical coupling coefficient of the X-cut lithium niobate transducer is relatively high, which is 0.68, but its expansion coefficient is quite different from that of the tellurium oxide crystal. When the operating temperature range is wide, due to thermal expansion and contraction, X-cut niobium Lithium-acid transducers will produce cracks, and in severe cases, the tellurium oxide crystal will be pulled apart, resulting in device damage

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