Scientists at the University of Konstanz in Germany and the National Institute of Standards and Technology (NIST) in the United States have built the first optical frequency comb — a tool for precisely measuring different frequencies of visible light — that actually looks like a comb.
The "teeth" of the new frequency comb are separated enough that when viewed with a simple optical system — a grating and microscope — the human eye can see each of the approximately 50,000 teeth spanning the visible colour spectrum from red to blue. A frequency comb with such well-separated, visibly distinct teeth will be an important tool for a wide range of applications in astronomy, communications and many other areas.
Read more at http://www.efytimes.com/e1/38767/fullnews.htm
No comments:
Post a Comment