Long-Exposure Photo of Laser Light (IMAGE) University of Vienna Caption A long-exposure photo of laser light in 'donut modes' (light beams with no intensity in the middle). Credit Robert Fickler, University of Vienna 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.