High-efficiency acousto-optic Q-switched device

Abstract

The invention discloses a high-efficiency acousto-optic Q-switched device, which comprises a radio frequency source, a transducer and an acousto-optic crystal arranged in sequence, wherein the radio frequency source is electrically connected to the transducer; and the transducer is fixed with the acousto-optic crystal. When incident light is incident in the first acousto-optic crystal, the input incident light is diffracted by the acousto-optic crystal to form first-order diffracted light and zero-order transmitted light and the light is outputted. The acousto-optic Q-switched device has a transducer bonding structure different from the conventional acousto-optic Q-switched device, the radio frequency power which needs to be applied is reduced obviously while the same Q-switched effects are ensured, and the device reliability is greatly improved.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a high-efficiency acousto-optic Q-switching device. Background technique [0002] Acousto-optic Q-switching devices are generally used in solid-state lasers for Q-switching to generate high-energy pulsed laser output. Due to the high energy of the laser, the acousto-optic Q-switching device generally uses quartz crystal or fused silica as the acousto-optic medium. [0003] Compared with tellurium dioxide crystals commonly used in acousto-optic modulators, the acousto-optic coefficients of quartz crystals and fused silica are much smaller. Therefore, in order to achieve the same acousto-optic Q-switching devices made of quartz crystals Diffraction efficiency, the required RF power is much higher, about 10 times. Therefore, this also puts forward higher requirements on the process of bonding crystals as transducers on quartz crystals or fused silica. [0004] The higher the RF po...

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Problems solved by technology

[0004] The higher the RF power, the more serious the thermal effect at the transducer will be. Even if the heat dissipation of the crystal is improved, the temperature at the transducer will still increase significantly. Because the crystal type of the transducer is different from the acousto-optic crystal, For example, the transducer usually uses lithium niobate crystal, 36-degree Y-cut is used in the case of acoustic longitudinal mode, X-cut is generally used in shear acoustic wave mode, and quartz crystal is used for acousto-optic crystal. Due to the difference in thermal expansion coefficient between lithium niobate crystal and quartz crystal Larger, as the transducer rises, it is easy to cause cracking of the lithium niobate crystal, which makes the performance of the acousto-optic Q-switching device deteriorate or even be damaged so that it is scrapped

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