A VCSEL with a Penny for Scale (image) American Institute of Physics Share Print E-Mail Caption A VCSEL with a penny for scale. Credit John T. Leonard Usage Restrictions This image may be used only with appropriate caption and credit. Share Print E-Mail 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.