Welcome to the Ye Research Group

"Every time you peel off another layer of nature and look in a little bit further,
it gives you the most fantastic feeling."

Breaking News: "Frequency Comb reaches extreme ultraviolet"

Physicists in the US have created an optical frequency comb that operates in the extreme ultraviolet (XUV). Touted as the first practical comb to work in this region of the spectrum, the device could be used to look for tiny variations in the fine-structure constant and other physical constants that could point to new physics. An XUV comb could also be used to create better atomic clocks and new techniques for atomic spectroscopy.  Read more...Physics World News, Nature News & Views Research

"Scientists confirm first frequency comb to probe ultraviolet wavelengths"

Physicists at JILA have created the first "frequency comb" in the extreme ultraviolet band of the spectrum, high-energy light less than 100 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 sharpening the measurement tool. Read more... R&D Magazine

Arman Cingoz, Dylan C. Yost, Thomas K. Allison, Axel Ruehl, Martin E. Fermann, Ingmar Hartl & Jun Ye. "Direct frequency comb spectroscopy in the extreme ultraviolet" Nature 482, 68-71 (02 February 2012)