Somersaulting Photons (IMAGE) University of Maryland Caption A STOV pulse (left) moving through a nonlinear crystal undergoes second harmonic generation, generating the pulse on the right Credit Hancock, Zahedpour, and Milchberg/University of Maryland 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.