Field of Blades Changes Laser Color (IMAGE) University of Bath Caption Incoming red light is converted to blue light by the 'field of blades' via Second Harmonic Generation. Credit Image credit: Ventsislav Valev and Alex Murphy. Usage Restrictions with credit 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.