Environmentally stable laser emits exceptionally pure light: Robust, narrow-linewidth laser could offer portable light source for GPS and gravitational wave observations

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.