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Applied Spectroscopy

Applied Spectroscopy

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  • Vol. 42, Iss. 2 — Feb. 1, 1988
  • pp: 331–335

Theoretical and Experimental Investigation of the Relationship Between Aperture Dimension and Signal-to-Noise Optimization in Thermal Lens Spectroscopy

Steven R. Erskine and Donald R. Bobbitt

Applied Spectroscopy, Vol. 42, Issue 2, pp. 331-335 (1988)


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Abstract

The effect of three types of experimental laser noise on conventional thermal lens spectroscopy are considered. Theoretical calculations of noise and signal-to-noise ratio as a function of aperture size are included to determine ideal aperture dimensions for systems limited by laser pointing instabilities, flicker noise, and/or shot noise. Experimentally determined noise curves are also presented and discussed in the context of the theoretical results. The results show that for most thermal lens configurations based on lock-in detection, optimum S/N is obtained at an aperture-to-beam-size ratio of 0.6.

Citation
Steven R. Erskine and Donald R. Bobbitt, "Theoretical and Experimental Investigation of the Relationship Between Aperture Dimension and Signal-to-Noise Optimization in Thermal Lens Spectroscopy," Appl. Spectrosc. 42, 331-335 (1988)
http://www.opticsinfobase.org/as/abstract.cfm?URI=as-42-2-331

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