Quantcast

Latest Frequency comb Stories

Scientists Confirm First 'Frequency Comb' To Probe Ultraviolet Wavelengths
2012-02-02 05:00:46

Physicists at JILA have created the first "frequency comb" in the extreme ultraviolet band of the spectrum, high-energy light less than 100 nanometers (nm) in wavelength. Laser-generated frequency combs are the most accurate method available for precisely measuring frequencies, or colors, of light. In reaching the new band of the spectrum, the JILA experiments demonstrated for the first time a very fine mini-comb-like structure within each subunit, or harmonic, of the larger comb, drastically...

NIST's Compact Frequency Comb Could Go Places
2011-10-27 04:51:47

Laser frequency combs–extraordinarily precise tools for measuring frequencies (or colors) of light–have helped propel advances in timekeeping, trace gas detection and related physics research to new heights in the past decade. While typical lasers operate at only a single or handful of frequencies, laser frequency combs operate simultaneously at many frequencies, approaching a million for some combs. These combs have very fine, evenly spaced "teeth," each a specific frequency,...

2011-10-20 09:27:39

Researchers at Purdue University and the National Institute of Standards and Technology (NIST) have created a device small enough to fit on a computer chip that converts continuous laser light into numerous ultrashort pulses, a technology that might have applications in more advanced sensors, communications systems and laboratory instruments. "These pulses repeat at very high rates, corresponding to hundreds of billions of pulses per second," said Andrew Weiner, the Scifres Family...

2011-06-28 12:39:44

By combining advanced laser technologies in a new way, physicists at the National Institute of Standards and Technology (NIST) have generated microwave signals that are more pure and stable than those from conventional electronic sources. The apparatus could improve signal stability and resolution in radar, communications and navigation systems, and certain types of atomic clocks. Described in Nature Photonics,* NIST's low-noise apparatus is a new application of optical frequency combs, tools...

2010-08-04 16:42:52

Purity of ingredients is a constant concern for the semiconductor industry, because a mere trace of contaminants can damage or ruin tiny devices. In a step toward solving a long-standing problem in semiconductor manufacturing, scientists at JILA and collaborators have used their unique version of a "fine-toothed comb" to detect minute traces of contaminant molecules in the arsine gas used to make a variety of photonics devices. JILA is a joint institute of the National Institute of Standards...

30a4fd805debb7f585c8290a055919ff1
2010-06-23 10:00:00

World first: PTB researchers transfer ultra-stable frequency across a 480 km long optical fiber link- Comparison of optical clocks is becoming much simpler When light is used to transmit information, well established techniques of optical telecommunications are available: modulated light pulses travel along optical fibers, become weaker due to optical attenuation in the fiber and are "refreshed" in signal regeneration stations along the way, where the signals are amplified and filtered. This...

4cba0a86e1d6d0fdad743cb06e5b33c9
2010-04-05 10:06:52

Optical frequency combs could tame quantum bits Physicists at the University of Maryland have found a way to turn a precision measurement device into a versatile tool for manipulating quantum bits (qubits). The researchers adapted a device known as an optical frequency comb in their novel approach to performing the sorts of quantum data operations that will be vital for future quantum computers. The research appears in this week's issue of Physical Review Letters and is described in a...

7eec628dd64e96ae0942d9aad8a44cb31
2009-10-30 08:53:52

Finally, an optical frequency comb that visibly lives up to its name. 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. As described in the Oct. 30 issue of Science,* the "teeth" of the new frequency comb are separated enough that when viewed with a...

ab32864a06de2e587eece37b9ff173b0
2009-10-02 14:33:28

The National Physical Laboratory (NPL) has helped to establish that femtosecond comb lasers can provide accurate measurement of absolute distance in formation flying space missions. NPL, along with collaborators, produced technical reports for the European Space Agency. The conclusions demonstrated that the lasers were a suitable method for measurement in such missions. Formation flying missions involve multiple spacecrafts flying between tens and hundreds of meters apart, which autonomously...

964b439075952db6f99cf1e5352c9cad1
2009-05-08 08:35:00

A new way of reading light will sharpen the view of planets around other stars Thanks to the ability of astronomers to detect the presence of extrasolar planets orbiting distant stars, scientists today are able to examine hundreds of solar systems. Now researchers at the Harvard-Smithsonian Center for Astrophysics in Cambridge, Mass. have created an "astro-comb" to help astronomers detect lighter planets, more like Earth, around distant stars. The Harvard group will present their findings at...


Word of the Day
conjunto
  • A style of popular dance music originating along the border between Texas and Mexico, characterized by the use of accordion, drums, and 12-string bass guitar and traditionally based on polka, waltz, and bolero rhythms.
The word 'conjunto' comes through Spanish, from Latin coniūnctus, past participle of coniungere, to join together; see conjoin