Journal
REVIEW OF SCIENTIFIC INSTRUMENTS
Volume 82, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3669783
Keywords
data acquisition; measurement by laser beam; optical modulation; optical pumping; optical signal detection; photodetectors; photodiodes; signal sampling; synchronisation
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Funding
- ONR [N00014-09-1-1103]
- National Science Foundation
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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 (Delta I/I(0) similar to 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. (C) 2011 American Institute of Physics. [doi:10.1063/1.3669783]
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