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. Author manuscript; available in PMC: 2022 Dec 27.
Published in final edited form as: Optica. 2021;8(5):10.1364/OPTICA.405938. doi: 10.1364/OPTICA.405938

Fig. 5.

Fig. 5.

Block diagram of the photothermal interferometer for absorption measurements (PCI). A slight angle between pump and probe beams allows dumping of the pump and pickup of either transmitted or reflected probe beam.