Influence of noise on the characterization of materials by terahertz time-domain spectroscopy

Journal of the Optical Society of America B: Optical Physics

Volumn 17, Issue 3, 2000, Pages 452-461

  Duvillaret, Lionel ^a   Garet, Fréderic ^a   Coutaz, Jean Louis ^a  

^a UNIVERSITÉ DE SAVOIE   (France)

Author keywords

[No Author keywords available]

Indexed keywords

LIGHT ABSORPTION; LIGHT REFLECTION; LIGHT TRANSMISSION; REFRACTIVE INDEX; SPECTROSCOPY; TIME DOMAIN ANALYSIS; TRANSPARENCY;

PARABOLIC MIRRORS;

SPURIOUS SIGNAL NOISE;

EID: 0034400299     PISSN: 07403224     EISSN: None     Source Type: Journal    
DOI: 10.1364/JOSAB.17.000452     Document Type: Article

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25. 22
26. Indeed, the Johnson noise is linked to the photoswitch resistance, which varies under laser illumination. Nevertheless, because of the slight decrease of the mean photoswitch resistance induced by the laser illumination, the Johnson noise is rather independent of the signal. Moreover, the shot noise is proportional to the square root of the signal amplitude and not to its amplitude.
27. Both noise analysis and uncertainty reduction procedures have been applied with time-domain reflectometry equipment in our laboratory for the characterization of guided structures in the microwave domain. First results confirm the possibility of extending these two methods to another area of time-domain characterization.
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