Pulsed laser noise analysis and pump-probe signal detection with a data acquisition card
Source: Rev. Sci. Instrum. 82, 123108 (2012); http://dx.doi.org/10.1063/1.3669783
Published 16 December 2011
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BibSonomyKEYWORDS and PACS
data acquisition,
measurement by laser beam,
optical modulation,
optical pumping,
optical signal detection,
photodetectors,
photodiodes,
signal sampling,
synchronisation
- 42.62.Eh
Metrological applications of lasers - 85.60.Dw
Photodiodes; phototransistors; photoresistors - 42.79.Hp
Optical processors, correlators, and modulators - 32.80.Xx
Atomic level crossing and optical pumping - 85.60.Gz
Photodetectors - 84.40.Ua
Telecommunications: signal transmission and processing; communication satellites - YEAR: 2011
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PUBLICATION DATA
1553-9601 (online)
AIP
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 (
I/I0 ~ 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.
©2011 American Institute of Physics
I/I0 ~ 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.
©2011 American Institute of Physics
| History: | Received 14 October 2011; accepted 26 November 2011; published 16 December 2011 |
| Digital Object Identifier: |
http://dx.doi.org/10.1063/1.3669783 |
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