数据采集
光电二极管
噪音(视频)
信号(编程语言)
放大器
能量(信号处理)
激光器
调制(音乐)
计算机科学
灵敏度(控制系统)
光学
物理
电子工程
电信
带宽(计算)
声学
图像(数学)
工程类
人工智能
操作系统
量子力学
程序设计语言
作者
Christopher A. Werley,Stephanie M. Teo,Keith A. Nelson
摘要
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.
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