用于钙离子光频标的高性能脉冲时序产生方法

Pulse sequence generation with high-performance for ^(40)Ca^+ optical frequency standard

在钙离子光频标实验研究中,为了保证钟跃迁谱线的测量精度和光频标的锁定精度,方便自动控制实验进程,研究了基于LabVIEW的数字波形法结合数据采集卡产生多通道脉冲信号的方法。该方法采用多路数字信号序列同步输出的方法,由板卡的板载硬件时钟源作为定时器,通过编程从计数器/定时器输出频率连续的矩形脉冲输入到采集卡作为控制各路数字波形输出的同步时钟,数字信号输出过程的数字通道样本输出率可达1 MHz,脉冲宽度的精度可稳定达到1μs,上升延迟小于50 ns,而且多路脉冲都以同一个计时起点开始,因此具有很好的分辨率、同步性和稳定性。

In order to ensure the measurement precision of clock transition and accuracy of locking of 40Ca＋ optical frequency standard, a method of multi-channel virtual pulse signal generation based on digital waveform of LabVIEW and data acquisition card was investigated. And the method benefits controlling automatically and conveniently the experimental process. The realized multi-channel generator adopts the way of multi-channel digital sequence sync-output and hardware clock of data acquisition card as timer. By programming the continuous rectangular pulses from the counter/timer, the output signals are sent to a data acquisition card as synchronous clock to control the output of digital waveform. The sample output rate of digital signal can reach 1 MHz, the precision of the pulse width can stably reach 1μs and the rising delay is less than 50 as. While all pulses of this generator are triggered simultaneously, the generator has good resolution, synchronism and stability.