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Potential Sources of Systematic Errors in Tunable-Diode-Laser Absorption Measurements

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Abstract:

There are various potential sources of systematic error in tunable-diode-laser absorption measurements. In this paper, we discuss two such sources that are associated with multimode lasing. The first is caused by secondary modes which are passed by a monochromator and are absorbed by lines not intentionally being studied. In the second source of error, different spatial modes may appear in different arms of a double-beam system. Both types of errors can give rise to rather dramatic systematic errors in frequency and concentration calibrations.

Keywords: Analytical methods; Diode lasers; Infrared; Spectroscopic techniques

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702864815457

Affiliations: National Bureau of Standards, Center for Analytical Chemistry, Gaithersburg, Maryland 20899

Publication date: January 1, 1986

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