Pulsed laser noise analysis and pump-probe signal detection with a data acquisition card
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Nelson_Pulsed laser.pdf
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Author(s)
Werley, Christopher Alan
Teo, Stephanie Meng-Yan
Nelson, Keith Adam
Date Issued
December 2011
Journal
Review of Scientific Instruments
Publisher
American Institute of Physics
Citation
Werley, Christopher A., Stephanie M. Teo, and Keith A. Nelson. “Pulsed laser noise analysis and pump-probe signal detection with a data acquisition card.” Review of Scientific Instruments 82, no. 12 (2011): 123108.© 2011 American Institute of Physics .
Version
Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1063/1.3669783
