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Reduction of Convective Low-Frequency Noise in Thermal Lens Spectrometry

Volume 44, Number 9 (Nov. 1990) Page 1501-1507

Alfonso, E. F. Simó; Revert, M. A. Rius; Alvarez-Coque, M. C. García; Ramos, G. Ramis


The construction and optimization of a thermal lens spectrometer with coaxial pump/probe configuration is reported. The low-frequency noise of convective origin is studied in detail, and it is demonstrated that a horizontal slit, instead of a pinhole, can be used as a simple way of reducing the noise to a negligible level without losing sensitivity.