Single-Laser, Single-Beam Pump/Probe Thermal Lens Spectroscopy

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A unique design for a thermal lens photometer based on a single-laser/single-beam configuration is presented. The system is compatible with lock-in detection and uses a pair of acousto-optic modulators to temporally separate the pump and probe events. A minimum measurable absorbance of 6 × 10−6 cm−1 is reported. Limitations to the use of acoustooptic modulation at high absorbances are discussed.

Keywords: Analytical methods; HPLC detector; Thermal lensing

Document Type: Research Article


Affiliations: Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701

Publication date: September 1, 1987

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