Abstract: Acousto-optic modulator is an important optical device, and its performance largely depends on the quality of driving power supply. Therefore, it is of great significance to develop high performance acousto-optic modulator driving power supply for different application scenarios. In order to meet the application requirement of optical parametric oscillation cavity length locking for acousto-optic modulator in vacuum squeezed light preparation in quantum optics, a high-performance acousto-optic modulator driving power supply is designed in this work. In this driving supply, the radio frequency metaloxide-semiconductor field-effect transistor (RF MOSFET) amplifier module RA07H0608M is proposed as the core device, and the input signal is finally injected into acousto-optic modulator after passing through impedance matching circuit, high-pass filtering amplifier circuit and power amplification circuit. At the same time, the monitoring circuit monitors the working temperature and signal power in real time. The results show that the acousto-optic modulator driving supply can achieve continuous frequency and power tuning. In the operating frequency range of 75-85 MHz, the input and output signals have a good linear relationship, the output power is up to 1 W, and automatic shutdown protection of over-temperature and over-power can be achieved. It is indicated that the designed driving power supply can fully meet the requirements of long-term stable operation of acousto-optic modulator.

Key words: optoelectronics, acousto-optic modulator driving power supply, radio frequency metal-oxidesemiconductor field-effect transistor, continuous tuning, automatic shutdown and protection circuit