Sagnac Interferometer Photothermal Deflection Spectroscopy (SIDPS) Technique (IMAGE) Tokyo University of Science Caption This technique enables evaluating the quantum efficiency of luminescence or chemical energy conversion. Credit Professor Eiji Tokunaga Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.