Femtosecond fiber laser device high-precision pulse POD control method and circuit

Abstract

The invention belongs to the technical field of optical communication, and particularly provides a femtosecond fiber laser device high-precision pulse POD control method and circuit. The femtosecond fiber laser device high-precision pulse POD control circuit comprises a sequential circuit, a seed clock circuit and an AOM drive circuit, wherein the seed clock circuit is connected with the sequential circuit, the AOM drive circuit is connected with the sequential circuit, the seed clock circuit is used for converting seed laser pulse into a clock signal and transmitting the clock signal to the sequential circuit, the sequential circuit is used for outputting a modulation pulse signal to the AOM drive circuit according to the seed clock signal and a received external trigger signal, and the AOM drive circuit is used for screening laser pulses emitted by a femtosecond fiber laser device according to the modulation pulse signal. According to the invention, a POD control circuit is designedin a femtosecond fiber laser device, so that synchronization between output laser and an external trigger signal is ensured; and by means of excellent low-jitter and high-precision triggering performance, the femtosecond fiber laser device can be used in cooperation with an advanced scanning galvanometer and a motion platform synchronously at a high speed, so that the machining effect and efficiency are greatly improved.

Description

Technical field [0001] The invention belongs to the field of optical communication technology, and specifically relates to a high-precision pulse POD control method and circuit of a femtosecond fiber laser. Background technique [0002] Femtosecond fiber lasers have very high instantaneous power due to their short pulse action time and small heat-affected zone (HAZ) on processed materials, so they are increasingly used in the field of precision processing. When the laser passes through the galvanometer to process complex graphics, the switching between the straight line and the curved part of the graph will inevitably cause the scanning speed of the galvanometer to change. If a fixed pulse repetition frequency is used, the laser stays in the curve part for too long and causes heat. The expansion of the affected area directly affects the processing effect. However, in the prior art, directly changing the output frequency of the laser will not only cause fluctuations in the laser ...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem in the prior art that high-energy laser pulses with a frequency of 1KHz-10MHz cannot be selected from high-energy laser pulses with a repetition rate of 50MHz and the delay jitter can be constrained within 25ns

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