title: Sagnac interferometer for photothermal deflection spectroscopy.
abstract: Photothermal deflection spectroscopy is combined with a Sagnac interferometer to enhance the sensitivity of the absorption measurement by converting the photothermal beam deflection effect into the light intensity change by the interference effect. Because of stable light interference due to the common path, the signal intensity can be amplified without increasing the noise by extending the optical path length between a sample and a photodetector. The sensitivity is further improved by the use of focusing optics and double-pass geometry. This makes photothermal deflection spectroscopy applicable to any kind of material in the whole visible region with a xenon lamp for excitation and water or air as a deflection medium.
authors: Department of Physics, Faculty of Science, Tokyo University of Science, 1–3 Kagurazaka, Tokyo 162–8601, Japan.
authors: Naoyuki
authors: N
authors: Shiokawa
authors: Yuki
authors: Y
authors: Mizuno
authors: Harumasa
authors: H
authors: Tsuchiya
authors: Eiji
authors: E
authors: Tokunaga