Pulsed laser noise analysis and pump-probe signal detection with a data acquisition card.
Pulsed laser noise analysis and pump-probe signal detection with a data acquisition card.
复制标题
DOI：
10.1063/1.3669783
复制
发表时间：
2011-12
期刊：
影响因子：
--
通讯作者：
C. Werley;Stephanie M. Teo;K. Nelson
中科院分区：
文献类型：
--
作者：
C. Werley;Stephanie M. Teo;K. Nelson
光电二极管和数据采集卡的采样时钟与激光的重复频率同步，用于测量每个激光脉冲的能量。对数据的简单分析产生了从非常低的频率到重复频率的一半的噪声频谱，并量化了脉冲能量分布。当两个用于平衡检测的光电二极管与光调制器结合使用时，该技术能够检测非常弱的泵浦-探测信号（ΔI/I（0）~ 10（-5）at 1 kHz），其灵敏度与锁定放大器竞争。使用数据采集卡进行检测是通用的，并且提供了许多优点，包括在信号处理的每个阶段期间对噪声进行完全量化、在数据收集完成之后进行计算机中的任意数字滤波、直接读出信号调制百分比、以及容易适应于泵和探针之间的延迟的快速扫描。
A photodiode and data acquisition card whose sampling clock is synchronized to the repetition rate of a laser are used to measure the energy of each laser pulse. Simple analysis of the data yields the noise spectrum from very low frequencies up to half the repetition rate and quantifies the pulse energy distribution. When two photodiodes for balanced detection are used in combination with an optical modulator, the technique is capable of detecting very weak pump-probe signals (ΔI/I(0) ~ 10(-5) at 1 kHz), with a sensitivity that is competitive with a lock-in amplifier. Detection with the data acquisition card is versatile and offers many advantages including full quantification of noise during each stage of signal processing, arbitrary digital filtering in silico after data collection is complete, direct readout of percent signal modulation, and easy adaptation for fast scanning of delay between pump and probe.