Unidirectional Rays of the Resonator (IMAGE) Harvard University Caption The new microlaser uses an elliptical resonator with a wavelength-sized notch (seen at top right) on the boundary to create unidirectional rays (bottom left). Credit Courtesy of the laboratory of Federico Capasso, Harvard School of Engineering and Applied Sciences (SEAS) 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.