An optical frequency comb is a way of measuring the frequency of light with great precision.
Tinker with the composition of this dye and you change the frequency of light that can be captured.
In small crystallites of ferrites, the electromagnetic radiation causes the magnetic moment to rotate at the frequency of light.
They are dispersive, meaning the angle of refraction depends very sensitively on the frequency of light, and they are lossy, meaning that they absorb energy from the light as it passes through.
His best-known contribution came in 1959, when, with his student Glen Rebka, he showed that gravity can change the frequency of light.
They could not directly see the planet, but they could spot undulations in the frequency of light from the star caused by the gravitational pull of the planet.
Results may be reported as "NMR spectra," graphs that show the probability that any given frequency of light will induce a transition.
However, when the clasp is exposed to a specific frequency of light, the DNA folds itself into a curved, closed shape that stops it binding to the thrombin.
With the new approach, the frequency of light used to stimulate neurons does not overlap with that emitted by the calcium sensor, so there is minimal interference between the two channels, and the holographic light beam stimulates neurons with a 'fast scanning' procedure lasting just 2 femtoseconds (billionths of a second) which further reduces the interference.
The observations of the University of Southampton astronomers turned up another oddity: telltale wobbles in the frequency of light that are caused by the gravitational pull of an unseen companion, the burnt-out core of a Sun-like star known as a white dwarf.
Because of the Doppler effect, the frequency of light reflected by ions that are moving towards the laser will be higher than that of light reflected by ions that are moving away from the laser.
