Laser-Like X-Ray Beam Profile (image) National Science Foundation Caption This picture shows an actual image of a coherent (laser-like) X-ray beam. In contrast to the incoherent (light-bulb-like) light emitted in all directions from a Roentgen X-ray tube, the X-rays produced by high harmonic generation emerge as well-directed, laser-like, beams. Credit Tenio Popmintchev, JILA and University of Colorado at Boulder Usage Restrictions Credit must be included. 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.