1. Of or relating to electromagnetic radiation between violet visible light and x-rays in the electromagnetic spectrum, having frequencies between 790 terahertz and 30 petahertz and wavelengths between 380 nanometers and 10 nanometers. 2. Of or relating to a light bulb that emits ultraviolet rad...
Femtosecond mode-locked lasers producing visible/infrared frequency combs have steadily advanced our understanding of fundamental processes in nature. For example, optical clocks employ frequency-comb techniques for the most precise measurements of time, permitting the search for minuscule drifts of natural ...
Optical waveforms of light reproducible with subcycle precision underlie applications of lasers in ultrafast spectroscopies, quantum control of matter and light-based signal processing. Nonlinear upconversion of optical pulses via high-harmonic generatio
This elegant invention, which was honoured by the 2005 Nobel Prize in Physics4'5, provides a direct link between radio and optical frequencies, allowing one to count cycles of an electromagnetic field at near-petahertz frequencies (1 petahertz is 1015 Hz). On page 68 of this issue, Cingoz...
few-cycletosub-cycle pulsesgiverisetowidebandcoherentEUVradiationextendingin energytoabout40electronvolts.Ourstudyindicatestheasso- ciationoftheemittedEUVradiationwithintrabandcurrentsof multi-petahertzfrequency,inducedinthelowestconductionband ofSiO 2 .Todemonstratetheapplicabilityofhigh-harmonicspec- troscopyto...
non-ionizing radiation does not have enough energy to ionize atoms. However, it can cause molecules to vibrate and rotate, which means things will start heating up. Typically, the different types of non-ionizing radiation are classified by frequency, which is stated in units of “hertz”, abbr...
The pulse duration was electronically adjustable between 11 and 35 ns at a repetition frequency from a few hertz to hundreds of kilohertz. Electronic adjustment of the pulse duration was achieved by relative timing offsets of individual seeders, opening an avenue to a range of on-line ...
The high-energy photons of UV light could excite electron emission from materials, and is named as the photoelectric effect and discovered by Heinrich Hertz in 1887. By collecting the emitted electrons at the different angles, the electronic structure of solids can be probed by measuring the energ...
This is revealed by the frequency of the emitted radiation and the theoretical interpretation of the experiments. “We have a strong indication that the laser pulses force the electrons to perform extremely fast oscillations of tens of Petahertz (1015 Hz) frequencies inside the crystal,” Gouliel...
By coupling a high-power, high-repetition-rate near-infrared frequency comb to a femtosecond optical cavity, a frequency comb operating in the extreme-ultraviolet spectral range has been produced, by high harmonic generation, and provides high-resolution