The main function of the optical chopper is to modulate continuous light into light with a fixed frequency and output the modulation frequency at the same time. It is usually used in conjunction with a phase-locked amplifier. The optical chopper is generally composed of the following components: a control unit, a chopper device, a chopper blade, and connecting wires. The optical chopper is mainly used in high-tech fields such as photoelectric detection, photoelectric sensing, remote sensing, and measurement systems, as well as aviation, aerospace, and military equipment.

The chopper blade has an adjustable slot. The blade consists of two discs. The discs are installed on the optical head. The duty cycle can be adjusted and the range of the optical chopper‘s chopping frequency can be expanded. The high-precision dual-frequency blade is a standard chopper blade. The high-precision blade has a stable chopping frequency and small jitter. The controller achieves this stability by tracking the outer slots of these high-precision blades.