多束超短脉冲束间同步诊断技术研究

Research on Diagnostics for Synchronization of Multi-Ultrashort Pulses

为实现多束超短脉冲束间同步状态的诊断,提出并验证了一种用于多束超短脉冲相干合成的束间同步诊断技术方案。以两束皮秒量级的超短脉冲为例,采用了时分复用的方法。首先,基于互相关的方法来实现两束超短脉冲之间的时间同步,然后在时间同步范围内,通过调节光束之间的相位差,并同步监测远场上焦斑干涉图样的变化来实现两束超短脉冲之间的相位同步。在该方案中,时间同步调节模块的调节精度为6.7 fs,调节范围为333 ps;相位同步调节模块的调节精度为0.007π,调节范围为150π。实验结果表明,基于该诊断技术方案,能够实现两束超短脉冲间的束间同步状态的诊断。

In order to realize the diagnostics for synchronization of multi-ultrashort pulses, a method to diagnose the synchronization of multi-ultrashort pulses is provided and tested. Taking two beams of picoseconds ultrashort pulses for example, the time division multiplexing method is used. Based on the cross-correlation method, the time synchronization between these two pulses is realized at first. Then, the phase difference of the beams within the range of time synchronization is adjusted. By monitoring the focal spot on far-field can implement the phase synchronization of two pulses. In this scheme, the regulation precision of temporal synchronization and phase synchronization is 6.7 fs and 0.007 π, respectively. The adjustable range of temporal and phase module is 333 ps and 150 π, respectively. The experimental results show that by using this diagnostics scheme the diagnostics for synchronization between two ultrashort pulses can realized.