Comparison of BaTiO3 Optical Novelty Configuration and Photothermal Lensing Configuration inPhotothermal Experiments

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Analytical Chemistry

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Photorefractlve BaTiO3 Is used as an optlcal novelty fllter to highlight the hlgh spatlal frequency components of the photothermal signal. A real-time phase gratlng recorded In BaTiO3 acts as a matched rejectlon spatlal filter for the probe laser. This reduces the statlonary background from the optical signals thereby Increasing slgnal contrast ratlos. Rejectlon of the monotonous statlonary slgnal provides a powerful means of Improving the photothermal signal. This paper describes the constructlon of this novel apparatus and the experlments performed In order to compare lts performance wlth photo- thermal lensing results. A theory that explains photothermal signal fllterlng wlth BaTiO3, as an adaptive spatlal frequency fllter is presented. Results comparlng the optical signals obtalned In a photothermal lensing experiments and those obtalned In the BaTiO3 optlcal novelty fllter experlments are presented. The optical novelty fllter signals demonstrate a remarkable Improvement In the signal contrasts for moderate photothermal-lnduced phase shifts.

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