光学
探测器
非线性系统
滤波器(信号处理)
停留时间
放大器
降噪
超短脉冲
噪音(视频)
调制(音乐)
像素
物理
计算机科学
激光器
带宽(计算)
声学
人工智能
电信
计算机视觉
图像(数学)
医学
临床心理学
量子力学
作者
Torben L. Purz,Steven T. Cundiff,Eric Martin
出处
期刊:Optics Letters
[The Optical Society]
日期:2021-10-01
卷期号:46 (19): 4813-4813
被引量:5
摘要
We show that accelerated nonlinear imaging, such as stimulated Raman scattering and pump–probe imaging, is enabled by an order of magnitude reduction of data acquisition time when replacing the exponentially-weighted-moving-average low-pass filter in a lock-in amplifier with a simple-moving-average filter. We show that this simple-moving-average (box) lock-in yields a superior signal-to-noise ratio and suppression of extraneous modulations with short pixel dwell times, if one condition for the relation between the lock-in time constant and modulation frequencies is met. Our results, both theoretical and experimental, indicate that for nonlinear imaging applications, the box lock-in significantly outperforms conventional lock-in detection. These results facilitate the application of ultrafast and nonlinear imaging as a new standard for material characterization.
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