Laser Mirror Schematic (IMAGE) University of California - Berkeley Caption The high-index-contrast sub-wavelength grating on the left reflects 99.9 percent of light, the same reflectivity as the much thicker distributed Bragg reflectors on the right. Credit Image by Michael Huang, UC Berkeley 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.