The following is an abstract for the selected article. A PDF download of the full text of this article is available here. Members may download full texts at no charge. Non-members may be charged a small fee for certain articles.
Theoretical and Experimental Investigation of the Relationship Between Aperture Dimension and Signal-to-Noise Optimization in Thermal Lens Spectroscopy
Volume 42, Number 2 (Feb. 1988) Page 331-335
Erskine, Steven R.; Bobbitt, Donald R.
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.