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Environmentally stable laser emits exceptionally pure light

Researchers have developed a compact laser that emits light with extreme spectral purity that doesn't change in response to environmental conditions. The new potentially portable laser could benefit a host of scientific applications, improve clocks for global positioning (GPS) systems, advance the detection of gravitational waves in space and be useful for quantum computing.

from Top Technology News -- ScienceDaily https://www.sciencedaily.com/releases/2019/01/190131101100.htm
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