Frequency Comb, Ultrafast Laser (image) National Institute of Standards and Technology (NIST) Share Print E-Mail Caption Experimental data from a NIST 'gap-toothed' frequency comb that is false colored to indicate the range from low power (red) to high power (blue). The comb is specially designed for astronomy. Each 'tooth' is a precisely known frequency, and the teeth are widely separated (by 20 gigahertz) in comparison to a standard comb. Credit Credit: M. Kirchner & S. Diddams/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.