Laser-generating Irregularities (IMAGE) University of Utah Caption This microscope view of a film of the polymer DOO-PPV shows clumps of undissolved polymer power within the darker dissolved polymer material. Such irregularities are believed to create the tiny cavities that act as built-in, mirror-like resonators to produce what is known as "random laser" light, according to a new University study. Credit Randy Polson, University of Utah. 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.