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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 41,
  • Issue 7,
  • pp. 1189-1193
  • (1987)

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<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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