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<sup>−6</sup> cm<sup>−1</sup> is reported. Limitations to the use of acoustooptic modulation at high absorbances are discussed.
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