In this paper, we propose a novel method to measure the frequency noise characteristics of narrow linewidth laser sources based on wavelength division multiplexing and cross-correlation estimation ...

Astronomers from the University of Turku in Finland and elsewhere have performed a broadband spectral and timing study of an ...

NASA's newest astrophysics space telescope launched in March on a mission to create an all-sky map of the universe. Now ...

We report measurements and traceability of terahertz wavelength and frequency. Terahertz frequency comb is used for traceability of terahertz frequency. Frequency of a stable source is precisely ...

NASA's Chandra X-ray Observatory provides a new look at the Andromeda galaxy in this multi-wavelength image that includes ...