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

Volume 41, Number 7 (Oct. 1987) Page 1189-1193

Erskine, Steven R.; Foley, C. Michael; Bobbitt, Donald R.

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.