Timing jitter measurement of transmitted laser pulse relative to the reference using type II second harmonic generation in two nonlinear crystals.
Timing jitter measurement of transmitted laser pulse relative to the reference using type II second harmonic generation in two nonlinear crystals.
复制标题
使用两个非线性晶体中的 II 型二次谐波发生，对发射激光脉冲相对于参考的定时抖动进行测量。
DOI：
10.1364/oe.17.019102
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发表时间：
2009
期刊：
影响因子：
3.8
通讯作者：
Junxiong Tang
中科院分区：
文献类型：
--
作者：
Xuelian Ma;Lu Liu;Junxiong Tang
提出并分析了一种新方法，用于使用两个用于二次谐波生成 (SHG) 的 II 类相位匹配非线性晶体来测量发射脉冲相对于参考脉冲的定时抖动。两个脉冲的偏振在两个晶体中交换，两个检测到的二次谐波信号之间的差异可以反映传输的抖动。与传统的 RF（射频）方法相比，这种新方法提供了高灵敏度和定时分辨率。由于两个晶体中的重叠电平相同，因此当两个脉冲之间没有时间延迟时，最终输出为零。因此，与之前使用一个晶体和两个二向色分束器的光学方法相比，不需要从最终输出中减去偏移，并且两个脉冲之间不需要时间延迟调整。利用非平稳非线性波耦合方程对两脉冲II型次谐波产生的抖动测量性能进行了理论研究。理论计算和分析表明，该方法的灵敏度和动态范围取决于脉冲宽度、晶体脉冲和两个基波脉冲之间的群速度差。
A new method is proposed and analyzed for measuring the timing jitter of the transmitted pulse relative to the reference pulse using two type II phase-matched nonlinear crystals for second harmonic generation (SHG). The polarizations of the two pulses are exchanged in two crystals and the difference between two detected second harmonic signals can reflect the transmitted jitter. This new method provides a high sensitivity and timing resolution compared with the conventional RF (radio frequency) method. Since the overlapping levels in the two crystals are the same, the final output is zero when there is no time delay between the two pulses. Thus no offset is necessary to be subtracted from the final output and no time delay adjustment is required between the two pulses, compared with the previous optical method using one crystal and two dichroic beamsplitters. The jitter measuring performance is studied theoretically using non-stationary nonlinear wave-coupled equations for type II SHG of two pulses. The theoretical computation and analysis show that the sensitivity and the dynamic range of this new method depend on pulse width, crystal pulses and group velocity difference between two fundamental pulses.