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Acousto optic Q-switched crystal is used to control the cavity loss and realize the abrupt change of Q value by virtue of the diffraction effect of acousto optic components. The so-called acoustooptic diffraction effect refers to the laser beam deflection caused by diffraction when passing through the ultrasonic field in the medium. Ultrasonic wave is a kind of longitudinal mechanical wave. When it propagates in the medium, it will cause the corresponding elastic deformation of the medium, and then stimulate the replacement of the dense phase, thus causing the change of the refractive index of the medium.

The acousto-optic Q-switch crystal device is placed in the resonator of the laser through acousto-optic devices. The acousto-optic Q-switch is composed of an acousto-optic medium transparent to the laser wavelength and a transducer (i.e., an ultrasonic generator). The transducer is driven by a high-frequency oscillation power supply to generate the corresponding mechanical vibration, thereby generating ultrasonic coupling to the acousto-optic medium.

The acousto-optic modulator is placed in the cavity according to the Bragg condition. For example, when the ultrasonic wave is added at both ends of the crystal, the beam deflects in the direction determined by the Bragg condition. Since the first order diffracted light deviates from the axis of the resonator, the loss increases. At this time, the loss of the cavity is serious, the Q value is very low, and the laser oscillation cannot be formed. At this stage, under the excitation of optical pump, the gain medium accumulates particles in large quantities at the high energy level of the laser. If the ultrasonic wave is suddenly removed at this time, the diffraction effect will disappear immediately, and the beam will pass through the uniform acousto-optic medium without deflection, resulting in a sudden decrease in the loss of the resonant cavity and an increase in the Q value, finally forming a relatively strong laser giant pulse output. Compared with electro-optic switch, acousto-optic switch has higher voltage (103-104V) and lower voltage (102V). Acousto optic Q-switched crystal is a widely used technology.

Guangbao Optoelectronics Co., Ltd. is specialized in the R&D and production of laser components. Its main products are laser crystals, laser optics and laser components. The company has professional capabilities in crystal growth, optical polishing, laser coating and device packaging, and has good experience in product production and quality control, which can provide stable and reliable products for laser users. After years of product resource accumulation and common growth with laser users, the company can provide customers with rich product use cases and overall solutions to better meet customer requirements. Toll free: 13072169838 (025-68790685)