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Physics
Nanorainbow: Expanding the optical spectrum at the smallest scale
Written by Light Publishing Center, Changchun Optical Research Institute, Precision Mechanical Physics, CAS Coherent broadband supercontinuum (CBS) generation with phase-matched second-order optical nonlinearity. a) Schematic illustration of CBS generation by DFG process in nanomaterials with deep subwavelength thickness (about 100 nm). The thickness is significantly thinner than the coherence length of the incident beam, allowing free movement of phase matching.…
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Physics
Bringing the power of tabletop precision lasers for quantum science to the chip scale
Andrei Ishchenko holds an ultra-high-quality ring resonator (left) that helps turn “coarse” light from a commercially available Fabry-Perot laser diode (right) into a low-linewidth laser. Credit: Sonia Fernandez, University of California, Santa Barbara For experiments that require ultra-high precision measurements and control of atoms (think two-photon atomic clocks, cold atom interferometer sensors, quantum gates), more spectrally pure (emitting a single…
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Earth
Explaining the dramatic changes on a global scale following the world’s final “Snowball Earth” event
A person looks at carbonate rocks in southern China in 2019. New research offers a new explanation for the dramatic global environmental changes that led to the formation of carbonate rocks. Photo by Yaron Liu One of the most dramatic climatic events in Earth’s history was the “Snowball Earth” event that occurred hundreds of millions of years ago, when almost…
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