Back-scattering Interferometer (IMAGE) Vanderbilt University Caption The back-scattering interferometer uses a red-light laser identical to those used in grocery store scanners. Credit Daniel Dubois 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.