Researchers of the Laser Physics and Nonlinear Optics group developed, in collaboration with researchers of the Lionix Company, the world’s most narrowband diode laser on a chip exhibiting a quantum limited spectral bandwidth of less than 300 Hz. This laser concept represents a breakthrough in the fast-growing field of photonics, and will bring applications such as 5G internet and accurate GPS closer (see also UT Press release). 290Hzdef..