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Jun Ye

Content About: Jun Ye

Published: 09/07/2017 - 1:15pm Type of Content: Article-Research Highlight

Researchers at JILA and around the world are starting a grand adventure of precisely controlling the internal and external quantum states of ultracold molecules after years of intense experimental and theoretical study. Such control of small molecules, which are the most complex quantum systems that can currently be completely understood from the principles of quantum mechanics, will allow...

Published: 07/18/2017 - 11:08am Type of Content: News

Leah Dodson won the Miller Prize at the 72nd International Symposium on Molecular Spectroscopy, held June 19–23 in Urbana, Illinois. Dodson is an NRC postdoc whose official advisor is Jun Ye, but who primarily works on molecular spectroscopy in the Mathias Weber lab. Her award-winning talk was entitled “Oxalate Formation in Titanium––Carbon Dioxide Anionic Clusters Studied by Infrared...

Published: 07/17/2017 - 2:30pm Type of Content: News

Bryce Bjork’s talk entitled “Direct Measurement of OD+CO-> cis-DOCO, trans-DOCO, and D+CO2 Branching Kinetics using Time-Resolved Frequency Comb Spectroscopy” was selected by a panel of judges at the International Symposium on Molecular Spectroscopy as one of three winners of the 2017 Rao Prize. The prize will be presented to Bjork at the June 2018 Symposium.

In addition, Bjork was...

Published: 12/21/2016 - 11:09am Type of Content: Article-Research Highlight

Research associate Shimon Kolkowitz and his colleagues in the Ye group and Rey theory group have developed a powerful new way to experimentally simulate the complex behavior of electrons in solids. In these experiments, the team uses its strontium lattice optical clock not to track time, but to take advantage of the ultracold atoms in the clock mimicking the quantum behavior of electrons in a...

Published: 12/19/2016 - 12:01pm Type of Content: Article-Research Highlight

Deborah Jin, Jun Ye, and their students wrote a review during the summer of 2016 for Nature Physics highlighting the accomplishments and future directions of the relatively new field of ultracold-molecule research. The field was pioneered by the group’s creation of the world’s first gas of ultracold potassium-rubidium (KRb) molecules in 2008.

The molecules were made by first creating...

Published: 10/27/2016 - 12:06pm Type of Content: Article-Research Highlight

Using frequency comb spectroscopy, the Ye group has directly observed transient intermediate steps in a chemical reaction that plays a key role in combustion, atmospheric chemistry, and chemistry in the interstellar medium. The group was able to make this first-ever measurement because frequency combs generate a wide range of laser wavelengths in ultrafast pulses. These pulses made it possible...

Published: 09/21/2016 - 11:28am Type of Content: News

Fellows Jun Ye and Deborah Jin (1968–2016) have been named Highly Cited Researchers for 2016 by Thomson Reuters. Highly Cited Researchers is an annual list that recognizes leading researchers from around the world based on an analysis of their research publications The 2016 list recognizes the most-cited authors of research publications in the period 2004 through 2014. Ye and Jin are two of...

Published: 07/29/2016 - 8:39am Type of Content: News

NRC Postdoc Ed Marti received an Outstanding Presentation Award for his presentation of the poster "Spin-Orbit Coupled Fermions in an Optical Clock" at the 2016  Boulder Laboratories Postdoctoral Poster Symposium held on July 20. This recognition was shared with NRC Postdoc Shimon Kolkowitz, who originally submitted the abstract as well as prepared the poster and a two-minute–...

Published: 05/04/2016 - 11:26am Type of Content: Article-Research Highlight

The Ye group just solved a major problem for using molecular fingerprinting techniques to identify large, complex molecules: The researchers used an infrared (IR) frequency comb laser to identify four different large or complicated molecules. The IR laser-light absorption technique worked well for the first time with these larger molecules because the group combined it with buffer gas...

Published: 04/20/2016 - 1:04pm Type of Content: Article-Research Highlight

The old JILA molecule factory (built in 2002) produced the world’s first ultracold polar molecules [potassium-rubidium (KRb)] in 2008. The old factory has been used since then for ultracold chemistry investigations and studies of the quantum behavior of ultracold molecules and the atoms that form them. The Jin-Ye group, which runs the molecule factory, is now wrapping up operations in the old...

Published: 03/31/2016 - 10:20am Type of Content: Article-Research Highlight

The Ye and Rey groups have discovered the strange rules of quantum baseball in which strontium (Sr) atoms are the players, and photons of light are the balls. The balls control the players by not only getting the atoms excited, but also working together. The players coordinate throwing and catching the balls. While this is going on, the balls can change the state of the players! Sometimes the...

Published: 01/28/2016 - 7:52am Type of Content: Article-Research Highlight

The Rey and Ye groups are in the midst of an extended collaboration on using the Ye group’s strontium (Sr) lattice clock for studies of spin-orbit coupling in pancake-like layers of cold Sr atoms. Spin-orbit coupling means an atom’s motion is correlated with its spin. It occurs in everyday materials when negatively charged electrons move in response to electromagnetic fields inside a crystal....

Published: 12/16/2015 - 12:31pm Type of Content: News

President Obama has selected JILA Fellow Jun Ye of NIST's Quantum Physics Division to receive a 2015 Presidential Rank Award. The award cited Ye's work advancing "the frontier of light-matter interaction and focusing on precision measurement, quantum physics and ultracold matter, optical frequency metrology, and ultrafast science."

The Presidential Rank Awards honor a select group...

Published: 11/06/2015 - 7:59am Type of Content: Article-Research Highlight

JILA’s cold molecule collaboration (Jin and Ye Groups, with theory support from the Rey Group) recently made a breakthrough in its efforts to use ultracold polar molecules to study the complex physics of large numbers of interacting quantum particles. By closely packing the molecules into a 3D optical lattice (a sort of “crystal of light”), the team was able to create the first “highly...

Published: 10/08/2015 - 12:54pm Type of Content: News

Deborah Jin and Jun Ye are Highly Cited Researchers for 2015, according to the Thomas Reuters website. The website states, "Highly Cited Researchers 2015 represents some of world’s most influential scientific minds. About three thousand researchers earned this distinction by writing the greatest number of reports officially designated by Essential Science Indicators as Highly Cited Papers—...

Published: 06/24/2015 - 3:48pm Type of Content: News

A National Science Foundation Discovery feature highlights the work of the Ye Lab in their dramatic development of laser frequency comb applications that have, according to the article "transformed basic scientific research and led to new technologies in so many different fields--timekeeping, medical research, communications, remote sensing, astronomy, just to name a few."

Learn more...

Published: 04/21/2015 - 9:16am Type of Content: Article-Research Highlight

The Ye group has just improved the accuracy of the world’s best optical atomic clock by another factor of three and set a new record for clock stability. The accuracy and stability of the improved strontium lattice optical clocks is now about 2 x 10-18, or the equivalent of not varying from perfect time by more than one second in 15 billion years—more than the age of the Universe. Clocks like...

Published: 04/20/2015 - 1:12pm Type of Content: Article-Research Highlight

The Ye Group recently investigated what first appeared to be a “bug” in an experiment and made an unexpected discovery about a new way to generate high-harmonic light using molecular gases rather than gases of noble atoms.

Graduate student Craig Benko and his colleagues in the Ye group were studying the interaction of light from an extreme ultraviolet (XUV) frequency comb with molecules...

Published: 04/16/2015 - 9:06am Type of Content: News

APS Physics has produced a lovely story entitled The World's Time by Andrei Derevianko on its Forum on International Physics. The story features Judah Levine, Jun Ye and other scientists from around the world. 

Published: 04/01/2015 - 12:21pm Type of Content: News

JILA graduate students Stephen Okoniewski (Perkins group), Jake Pettine (Nesbitt group), and Lindsay Sonderhouse (Ye group) have won coveted 2015 National Science Foundation Graduate Research Fellowships, NSF announced March 31. The five-year Graduate Research Fellowships provide three years of support, with a per-year stipend of $34,000 and cost of education allowance of $12,000. Tuition and...

Published: 11/03/2014 - 11:29am Type of Content: News

At the nearby University of Colorado Boulder [Ye Lab] is a clock even more precise than the [clock used for the U.S. Time standard].

At the heart of this new clock is the element strontium. Inside a small chamber, the strontium atoms are suspended in a lattice of crisscrossing laser beams. Researchers then give them a little ping, like ringing a bell. The strontium vibrates at an...

Published: 08/18/2014 - 7:47am Type of Content: Article-Research Highlight

Symmetries described by SU(N) group theory made it possible for physicists in the 1950s to explain how quarks combine to make protons and neutrons and JILA theorists in 2013 to model the behavior of atoms inside a laser. Now, the Ye group has observed a manifestation of SU(N≤10) symmetry in the magnetic behavior of strontium-87 (87Sr) atoms trapped in crystals of light created by intersecting...

Published: 07/09/2014 - 10:29am Type of Content: News

A newly released report from Thomson Reuters on "The World's Most Influential Scientific Minds 2014" includes JILAns Jun Ye and Debbie Jin. The selection of scientists for the report was based on an analysis of Web of Science  and InCites citation reports for an 11-year period to identify those researchers who published the highest impact work from 2002–2012 and 2012–2013. The report...

Published: 06/24/2014 - 9:21am Type of Content: News

Two JILA graduate students and one undergraduate student were recognized with awards for their posters and presentations at the recent Boulder Laboratories Postdoctoral Poster Symposium, held at NIST Boulder (325 Broadway) on Wednesday, June 18, 2014. The Outstanding Presentation Award is a special recognition for selected poster presenters at the Boulder Laboratories Postdoctoral Poster...

Published: 06/17/2014 - 8:39am Type of Content: Article-Research Highlight

The Ye group has not only made two invisible rulers of extreme ultraviolet (XUV) light, but also figured out how to observe them with ordinary laboratory electronics. With this setup, the researchers were able to prove that the two rulers had extraordinarily long phase-coherence time. This feat is so profound, it is nearly certain to transform the investigation of matter with extreme...

Published: 06/13/2014 - 3:21pm Type of Content: Article-Research Highlight

Imagine a network of multiple clocks orbiting the Earth, not only reporting down to us, but also collaborating quantum mechanically among themselves to operate precisely in sync as a single global superclock, or world clock. The world clock is delivering the most precise timekeeping in all of human history—to every member nation regardless of politics, alliances, or behavior on the ground....

Published: 03/05/2014 - 8:32am Type of Content: Article-Research Highlight

There’s exciting news from JILA’s ultracold molecule collaboration. The Jin, Ye, Holland, and Rey groups have come up with new theory (verified by experiment) that explains the suppression of chemical reactions between potassium-rubidium (KRb) molecules in the KRb quantum simulator. The main reason the molecules do not collide and react is continuous measurement of molecule loss from the...

Published: 01/22/2014 - 11:16am Type of Content: Article-Research Highlight

JILA and NIST labs are well on the way to creating astonishingly accurate optical atomic clocks based on the neutral atoms strontium (Sr) and ytterbium (Yb). The new technologies are already capable of the most meticulous timekeeping in human history.

JILA Fellow Jun Ye’s group has developed an optical atomic clock that uses neutral Sr atoms held in an optical lattice (i.e., crystal of...

Published: 12/06/2013 - 7:43am Type of Content: Article-Research Highlight

Physicists wonder about some pretty strange things. For instance, one burning question is: How round is the electron? While the simplest picture of the electron is a perfect sphere, it is possible that it is instead shaped like an egg. The egg shape would look a bit like a tiny separation of positive and negative charges. Physicists call this kind of charge separation an electric dipole moment...

Published: 08/13/2013 - 2:21pm Type of Content: Article-Research Highlight

Research associate Bo Yan and his colleagues recently observed spin exchanges in ultracold potassium-rubidium (KRb) molecules inside an optical lattice (a crystal of light formed by interacting laser beams). In solid materials, such spin exchanges are the building blocks of advanced materials and exotic behavior.

The spin exchanges occurred when a rotationally excited KRb molecule...

Published: 08/08/2013 - 2:08pm Type of Content: Article-Research Highlight

Because quantum mechanics is crucial to understanding the behavior of everything in the Universe, one can understand key elements of the behavior of a neutron star by investigating the behavior of an atomic system in the laboratory. This is the promise of the new quantum simulator in the Ye labs. It is a fully controllable quantum system that is being used as a laboratory to study the behavior...

Published: 04/09/2013 - 10:03am Type of Content: Article-Research Highlight

The Ye group has opened a new gateway into the relatively unexplored terrain of ultracold chemistry. Research associate Matt Hummon, graduate students Mark Yeo and Alejandra Collopy, newly minted Ph.D. Ben Stuhl, Fellow Jun Ye, and a visiting colleague Yong Xia (East China Normal University) have built a magneto-optical trap (MOT) for yttrium oxide (YO) molecules (Figure 1). The two-...

Published: 04/09/2013 - 1:01pm Type of Content: Article-Research Highlight

The Ye and Bohn groups have made a major advance in the quest to prepare “real-world” molecules at ultracold temperatures. As recently reported in Nature, graduate students Ben Stuhl and Mark Yeo, research associate Matt Hummon, and Fellow Jun Ye succeeded in cooling hydroxyl radical molecules (*OH) down to temperatures of no more than five thousandths of a degree above absolute zero (5mK)....

Published: 09/26/2013 - 2:49pm Type of Content: Video Gallery

What does it take to win a Nobel Prize? It turns out that a sense of humor helps. Meet some of the extraordinary scientists behind one of the University of Colorado Boulder's renowned joint institutes, JILA.

Published: 09/26/2013 - 1:05pm Type of Content: Video Gallery

See inside JILA's new lab facilities at the University of Colorado Boulder, and hear what its Nobel Prize winning scientists envision for future discoveries.

Published: 04/09/2013 - 2:55pm Type of Content: Article-Research Highlight

The world’s most stable optical atomic clock resides in the Ye lab in the basement of JILA’s S-Wing. The strontium-(Sr-)lattice clock is so stable that its frequency measurements don’t vary by more than 1 part in 100 quadrillion (1 x 10-17) over a time period of 1000 seconds, or 17 minutes. This impressive result was obtained by lead graduate student Travis Nicholson, graduate students Mike...

Published: 04/10/2013 - 11:49am Type of Content: Article-Research Highlight

Researchers from a German national laboratory, the Physikalisch-Technische Bundesanstalt (PTB) have collaborated with Fellow Jun Ye, Visiting Fellow Lisheng Chen (Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences), and graduate student Mike Martin to come up with a clever approach to reducing heat-related “noise” in interferometers. Interferometers are widely used...

Published: 09/25/2012 - 2:35pm Type of Content: News

Research associate Matthew Hummon and graduate student Benjamin Stuhl won two of the five Outstanding Presentation Awards at the 2012 Boulder Laboratories Postdoctoral Poster Symposium. Hummon was recognized for his presentation entitled "Making a Magneto-Optical Trap for Polar Molecules." His co-authors were Mark Yeo, Benjamin Stuhl, Alejandra Collopy, Yong Xia, and Jun Ye.

Stuhl was...

Published: 02/01/2012 - 5:00pm Type of Content: Article-Research Highlight

The Ye group has created the world’s first “ruler of light” in the extreme ultraviolet (XUV). The new ruler is also known more formally as the XUV frequency comb. The comb consists of hundreds of equally spaced “colors” that function in precision measurement like the tics on an ordinary ruler. The amazing thing about this ruler is that XUV colors have such short wavelengths they aren’t even...

Published: 09/13/2011 - 6:00pm Type of Content: Article-Research Highlight

Physicists would very much like to understand the physics underlying high-temperature superconductors. Such an understanding may lead to the design of room temperature superconductors for use in highly efficient and much lower-cost transmission networks for electricity. A technological breakthrough like this would drastically reduce world energy costs. However, this breakthrough requires a...

Published: 09/01/2011 - 6:00pm Type of Content: Article-Research Highlight

The Ye group has built a cool new system for studying cold collisions between molecules. The system is far colder than a typical chemistry experiment that takes place at room temperature or hotter (300–500 K). But, it’s also much warmer than experiments that investigate ultracold-molecule collisions conducted at hundreds of billionths of a degree above absolute zero (0 K). The new system is...

Published: 06/17/2013 - 12:44pm Type of Content: News

Fellows Debbie Jin and Jun Ye will share a Department of Commerce Gold Medal this year for their seminal work on ultracold molecules and cold chemistry. The Gold Medal is the highest award presented by the Department of Commerce and NIST. The Gold Medal will be presented to Jin and Ye at a ceremony in December in Washington, D. C.

"It is the dedication of employees like Debbie and Jun...

Published: 06/17/2013 - 12:53pm Type of Content: News

On May 3, the National Academy of Sciences announced the selection of Jun Ye as one of 72 new members and 18 foreign associates. Ye is a Fellow of JILA and a Fellow of NIST, the National Institute of Standards and Technology. He is also an adjoint professor in the Department of Physics at the University of Colorado at Boulder. Ye and his scientific colleagues were recognized for their...

Published: 06/17/2013 - 12:38pm Type of Content: News

 Fellow Jun Ye has been elected as a Director at Large for the Optical Society of America (OSA). He will begin his three-year term on January 1, 2012.

"OSA is pleased to welcome Jun to the Board," said Elizabeth Rogan, OSA's chief executive officer. OSA members include more than 130,000 professionals from 175 countries. OSA brings together the global optics community through its...

Published: 03/20/2011 - 6:00pm Type of Content: Article-Research Highlight

In 2008, the Ye and Jin groups succeeded in making ultracold potassium-rubidium (KRb) molecules in their ground state (See “Redefining Chemistry at JILA” in the Spring 2010 issue of JILA Light & Matter). Their next goal was to figure out how to precisely control chemical reactions of these ultracold polar molecules by manipulating the quantum states of the reactants. But first the...

Published: 02/02/2011 - 5:00pm Type of Content: Article-Research Highlight

Quantum Paradox Derails Unwanted Collisions

In 2008-2009, much to their amazement,researchers working on the Jun Ye group’s neutral Sr optical atomic clock discovered tiny frequency shifts caused by colliding fermions! They figured out that the clock laser was interacting slightly differently with the Sr atoms inside a one-dimensional (pancake-shaped) trap. The light-atom...

Published: 06/17/2013 - 1:05pm Type of Content: News

Jun Ye has been selected as the 2011 Frew Fellow by the Australian Academy of Science. Ye will present the Frew Lecture at the Australasian Conference on Optics, Lasers, and Spectroscopy (ACOLS), which is incorporated in the International Electronic Conference/CLEO Pacific Rim 2011 meeting to be held in Sydney, Australia,  from August 29 to September 1, 2011. In addition to presenting the...

Published: 01/13/2011 - 5:00pm Type of Content: Article-Research Highlight

“Nature is built quantum mechanically,” says Fellow Jun Ye, who wants to understand the connections between atoms and molecules in complex systems such as liquids and solids (aka condensed matter). He says that the whole Universe is made of countless interacting particles, and it would be impossible to figure out the myriad connections between them one particle at a time, either theoretically...

Published: 11/23/2010 - 5:00pm Type of Content: Article-Research Highlight

Fellow Jun Ye’s group has enhanced the molecular fingerprinting technique with the development of a mid-infrared (mid-IR) frequency comb.  The new rapid-detection technique can now identify traces of a wider variety of molecules found in mixtures of gases. It offers many advantages for chemical analysis of the atmosphere, climate science studies, and the detection of suspicious substances...

Published: 04/08/2010 - 6:00pm Type of Content: Article-Research Highlight

Fellows Deborah Jin, Jun Ye, and John Bohn are exploring new scientific territory in cold-molecule chemistry. Experimentalists Jin and Ye and their colleagues can now manipulate, observe, and control ultralow-temperature potassium-rubidium (KRb) molecules in their lowest quantum-mechanical state. Theorist Bohn analyzes what the experimentalists see and predicts molecule behaviors under...

Published: 04/08/2010 - 6:00pm Type of Content: Article-Research Highlight

The cold-molecule collaboration has developed a method for directly imaging ultracold ground-state KRb molecules. Their old method required the transfer of ultracold KRb molecules into a Feshbach state, which is sensitive to electric and magnetic fields. Thus researchers had to turn off the electric field and keep the magnetic field at a fixed value during the imaging process. However, the...

Published: 04/08/2009 - 6:00pm Type of Content: Article-Research Highlight

According to the laws of quantum mechanics, identical fermions at very low temperatures can’t collide. These unfriendly subatomic particles, atoms, or molecules simply will not share the same piece of real estate with an identical twin. A few years back, researchers in the Ye lab considered this unneighborly behavior a big advantage in designing a new optical atomic clock based on an ensemble...

Published: 02/09/2009 - 5:00pm Type of Content: Article-Research Highlight

Last year the Ye group conducted an actual laboratory astrophysics experiment. Graduate students Brian Sawyer, Ben Stuhl, and Mark Yeo, research associate Dajun Wang, and Fellow Jun Ye fired cold hydroxyl (OH) radicals into a linear decelerator equipped with an array of highly charged electrodes and slowed the OH molecules to a standstill. These molecules were then loaded into a permanent...

Published: 02/09/2009 - 5:00pm Type of Content: Article-Research Highlight

In the summer of 2008, Fellow Jun Ye spent a couple of months at CalTech, where he ran into another visiting professor, former JILA Fellow Peter Zoller. Zoller left JILA in 1994 to become Professor of Physics at the University of Innsbruck (Austria). Besides riding bikes together in the mountains, the two men engaged in happy and fruitful discussions about Ye’s work developing a strontium- (Sr...

Published: 07/08/2008 - 6:00pm Type of Content: Article-Research Highlight

Fellow Jun Ye’s group is methodically working its way toward the creation of an X-Ray frequency comb. Recently, senior research associate Thomas Schibli, graduate student Dylan Yost, Fellow Jun Ye, and colleagues from IMRA America, Inc. developed a high-performance, ultrastable fiber laser optical frequency comb. At the same time, Yost developed a clever method for getting coherent short-...

Published: 04/08/2008 - 6:00pm Type of Content: Article-Research Highlight

 

What sort of experiment could detect the effects of quantum gravity, if it exists? Theories that go beyond the Standard Model of physics include a concept that links quantum interactions with gravity. Physicists would very much like to find evidence of this coupling as these two branches of physics are not yet unified in a single theory that explains everything about our...

Published: 04/08/2008 - 6:00pm Type of Content: Article-Research Highlight

By late 2006, Fellow Jun Ye’s clock team had raised the accuracy of its strontium (Sr)-lattice atomic clock to be just shy of that of the nation’s primary time and frequency standard, the NIST-F1 cesium (Cs) fountain clock. Graduate students Marty Boyd and Andrew Ludlow led the effort to improve the clock’s accuracy. But then, the clock team had to spend another year proving that its imporved...

Published: 04/08/2008 - 6:00pm Type of Content: Article-Research Highlight

With every breath you take, you breathe out carbon dioxide and roughly 1000 other different molecules. Some of these can signal the early onset of such diseases as asthma, cystic fibrosis, or cancer. Thanks to graduate student Mike Thorpe and his colleagues in Fellow Jun Ye’s group, medical practitioners may one day be able to identify these disease markers with a low-cost, noninvasive breath...

Published: 02/09/2008 - 5:00pm Type of Content: Article-Research Highlight

When the Jin and Ye group collaboration wanted to investigate the creation of stable ultracold polar molecules, the researchers initially decided to make ultracold KRb (potassium-rubidium) molecules and then study their collision behavior. Making the molecules required a cloud of incredibly cold K and Rb atoms, the ability to apply a magnetic field of just the right strength to induce a...

Published: 04/08/2007 - 6:00pm Type of Content: Article-Research Highlight

Researchers from the Ye, Bohn, and Greene groups are busy exploring a cold new world crawling with polar hydroxyl radical (OH) molecules. The JILA experimentalists have already discovered how to cool OH to “lukewarm” temperatures of 30 mK. They’ve precisely measured four OH transition frequencies that will help physicists determine whether the fine structure constant has...

Published: 09/29/2006 - 6:00pm Type of Content: Article-Research Highlight

In the race to develop the world's best optical atomic clock, accuracy and precision are what count. Accuracy is the degree to which a measurement of time conforms to time's true value. Precision is a gauge of the exactness, or reproducibility, of the measurements. By definition, a high-precision clock must be extremely stable. JILA may well be home to one of the world's most precise (and...

Published: 07/08/2006 - 6:00pm Type of Content: Article-Research Highlight

"In the right light, in the right time, everything is extraordinary," according to photographer Aaron Rose. He could have just as easily been describing precision optical spectroscopy experiments recently conducted by Research Associates Tanya Zelevinsky and Tetsuya Ido, Graduate Students Martin Boyd and Andrew Ludlow, Fellow Jun Ye and collaborators from Poland's Instytut Fizyki and NIST's...

Published: 04/08/2006 - 6:00pm Type of Content: Article-Research Highlight

There's only one way to prove you've invented a better atomic clock: Come out on top of a comparison of your clock with one of the world's best atomic clocks: The NIST-F1 cesium fountain atomic clock, the nation's primary time and frequency standard. NIST-F1 is so accurate it won't gain or lose a second in more than 60 million years.

That's the gold standard Graduate Students Andrew...

Published: 04/08/2006 - 6:00pm Type of Content: Article-Research Highlight

Science sleuths have a new and powerful method for identifying (and investigating) atoms and molecules, thanks to Graduate Student Mike Thorpe, Research Associate Kevin Moll, Senior Research Associate Jason Jones, Undergraduate Student Assistant Ben Safdi, and Fellow Jun Ye. The new method allows them to study molecular vibrations, rotations, and collisions as well as temperature changes and...

Published: 09/29/2005 - 6:00pm Type of Content: Article-Research Highlight

Scientists in Fellow Jun Ye's lab are developing a high-precision optical atomic clock linked to super-narrow optical transitions in ultracold, trapped strontium atoms. However, unless the new clock is portable (it is not) or researchers figure out how to accurately transmit its clock signal over a fiber optic network to NIST, the legendary strontium clock will not be able to help the world...

Published: 09/29/2005 - 6:00pm Type of Content: Article-Research Highlight

Fellow Jan Hall has been working on stabilizing the frequency of lasers since the 1960s. Now, he, JILA Research Associate Mark Notcutt, Long-Sheng Ma (currently at BIPM in France), and Fellow Jun Ye have devised an improved, compact, and less expensive method for stabilizing lasers. The new method is based on a small, vertically mounted optical cavity (shown on the right). Because the cavity...

Published: 04/08/2005 - 6:00pm Type of Content: Article-Research Highlight

Jason Jones, Kevin Moll, Mike Thorpe, and Jun Ye have generated the world's first precise frequency comb in the extreme ultraviolet (EUV) using a combination of an ultrafast mode-locked laser and a precision high-finesse optical cavity. The EUV frequency comb consists of regularly spaced sharp lines that extend into the EUV region of the electromagnetic spectrum. It is generated by coherent...

Published: 04/08/2005 - 6:00pm Type of Content: Article-Research Highlight

A high-powered JILA collaboration led by JILA Fellows Jun Ye and Chris Greene is making important progress toward developing an ultrastable, high-accuracy optical atomic clock. The new optical clock design will use a variety of laser sources including a femtosecond comb and a diode laser stabilized with an optical cavity, which, in turn, is locked to a narrow energy level transition in...

Published: 04/08/2005 - 6:00pm Type of Content: Article-Research Highlight

Three years ago Jun Ye decided to apply an old idea for amplifying and stabilizing continuous-wave (cw) lasers to state-of-the-art ultrafast lasers. In 2002, Jason Jones, a postdoctoral fellow with Jun, analyzed whether the build-up cavities used to amplify cw laser outputs could be modified to work with ultrafast, mode-locked lasers. His detailed calculations suggested that it would be...

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