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Making and controlling crystals of light - Phys.org

Date published: 2019-09-10
Originally published: Here. Excerpt below.


Optical microresonators convert laser light into ultrashort pulses travelling around the resonator's circumference. These pulses, called "dissipative Kerr solitons," can propagate in the microresonator maintaining their shape.
When solitons exit the microresonator, the output light takes the form of a pulse traina series of repeating pulses with fixed intervals. In this case, the repetition rate of the pulses is determined by the microresonator size. Smaller sizes enable pulse trains with high repetition rates, reaching hundreds of gigahertz in frequency. These can be used to boost the performance of optical communication links or become a core technology for ultrafast LiDAR with sub-micron precision.
Exciting though it is, this technology suffers from what scientists call "light-bending losses"loss of light caused by structural bends in its path. A well-known problem in fiber optics, light-bending loss also means that the size of microresonators cannot drop below a few tens of microns. This therefore limits the maximum repetition rates we can achieve for pulses.
Publishing in Nature Physics, researchers from the lab of Tobias J. Kippenberg at EPFL have now found a way to bypass this limitation and uncouple the pulse repetition rate from the microresonator size by generating multiple solitons in a single microresonator.
The scientists discovered a way of seeding the microresonator with the maximum possible number of dissipative Kerr solitons with precisely equal spacing between them. This new formation of light can be thought of as an optical analogue to atomic chains in crystalline solids, and so the researchers called them "perfect soliton crystals" (PSCs).
Due to interferometric enhancement and the high number of optical pulses, PSCs coherently multiply the performance of the resulting pulse trainnot just its repetition rate, but also its power.
The researchers also investigated the dynamics of PSC formations. Despite their highly organized structure, they ...


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