Gallium nitride purple surface emitting laser (IMAGE) Meijo University Caption The gallium nitride purple surface emitting laser with a power conversion efficiency of more than 20% Credit Tetsuya Takeuchi / Meijo University Usage Restrictions This image may be used with appropriate credit Translations License Original 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.