Research On High-precision Multi-channel Laser Synchronous Trigger System

Lasers are widely used in various major industrial equipment,radars,weapons,communications,and physical experiments due to their special physical properties such as high energy,good directionality,coherence,and good monochromaticity.The rapid development of laser technology has also promoted the progress of major scientific devices and engineering,automated test experiments,and precision optoelectronic equipment.In large precision equipment,due to the diverse and complex functions of the entire system,the requirements for time accuracy between various components during operation are relatively high,and the limitations of single-channel laser triggering are becoming more and more obvious.Therefore,a multi-channel laser scheme is usually used for synchronous triggering to ensure the trigger accuracy of each component in the device,which mainly includes the requirements of delay accuracy,jitter,rising edge,anti-interference and other parameters.In addition,in high-energy physics and other measurement experiments,the multi-channel laser synchronous trigger system can provide a variety of synchronous time-scale reference signals for different devices,and it is an extremely powerful tool for triggering multiple test instruments.Aiming at the actual needs of multi-channel complex laser systems and the current status of insufficient domestic research,this paper has carried out the system design and key technology research of high-precision multi-channel laser synchronous triggering.The main research contents of this paper include:1.First study the high-precision delay control method,design the delay technology based on the PLL phase-locked loop phase shift,realize the fine adjustment within one clock cycle,the adjustment accuracy is≤Ins;The system is equipped with a dedicated delay chip and peripheral circuits to finally achieve an adjustment step of 10ps.The precision delay module is electrically isolated from the outside world,with stable performance and simple control.2.Secondly,the photoelectric signal fast sampling circuit and signal analysis method are studied,and the synchronous logic circuit and time detection circuit are designed.The system realizes the automatic feedback adjustment of the delay time based on the timing judgment result or the time difference data.3.Then two human-computer interaction modes are studied,and the PC-based LabVIEW control software and the embedded-based touch screen control system are designed to realize parameter configuration and display,system switching and other functions.The operating system has strong portability,is convenient and flexible,has good operability,and takes up less space.4.Finally,the overall performance of the multi-channel laser synchronous trigger system and the pulse energy amplification characteristics of the MOPA excimer laser device are explored.The synchronization trigger system can achieve an adjustment resolution of 10ps;delay and pulse width adjustment range 0～325μs;external trigger jitter<±3ns,synchronization jitter<60ps;rising edge time<1.1ns,falling edge time<1.4ns;voltage adjustment range 1.5～15V.Using this system and MOPA structure excimer laser device to carry out linkage test,realized the dual-cavity discharge timing jitter less than±3ns;and explored the effect of repetition frequency on the output pulse energy;High accuracy of discharge delay of the whole system.Under the high repetition frequency of 4kHz,the pulse amplification of the seed cavity is successfully obtained by controlling the delay time,and the maximum amplification rate of the dual cavity is 19.19 and the maximum output pulse energy is 7.1mJ;Finally,in the closed-loop control of the dual-cavity discharge sequence,the automatic feedback adjustment of the delay time is realized.This article uses PLL phase-locked loop phase-shifting technology and a dedicated delay chip to design a high-resolution multi-channel laser synchronous trigger system.The system has achieved long-term stable operation and real-time control in a complex electromagnetic interference environment;At the same time,it has the ability of fast sampling of photoelectric signals,time detection and logic judgment,and can realize automatic feedback adjustment of the system.It has certain reference value in the fields of high-precision pulse testing and complex systems of multiple lasers.