NIST/JILA 'Dark Pulse Laser' Produces Bursts of ... Almost Nothing (image) National Institute of Standards and Technology (NIST) Share Print E-Mail Caption Colorized trace of pulses from the NIST/JILA "dark pulse" laser, indicating the light output nearly shuts down about every 2.5 nanoseconds. Credit Talbott/NIST Usage Restrictions None 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.