A cover article of the January 2019 issue of Nature Photonics, a highly-referenced journal in the field of photonics, describes a chip-scale Brillouin laser capable of emitting light with a fundamental linewidth of less than 1 Hz - narrow enough to move demanding scientific applications to the chip scale.
Cátia Pinho a fellow researcher from IT in Aveiro contributed to this work in the scope of a scientific research mission under her Ph.D. studies at the Optical Communications and Photonic Integration (OCPI) group from the University of California, Santa Barbara (UCSB) advised by Daniel Blumenthal, Professor of Department of Electrical and Computer Engineering at UCSB.
Spectrally pure lasers, the heart of precision high-end scientific and commercial applications, are poised to make the leap from the laboratory to integrated circuits. Translating this performance to integrated photonics will dramatically reduce cost and footprint for applications such as ultrahigh capacity fibre and data centre networks, atomic clocks and sensing. The demonstrated sub-hertz fundamental linewidth Brillouin laser translates advantages of non-integrated designs to the chip scale. Single- and multiple-frequency output operation provides a versatile low phase-noise solution, highlighted by the demonstration of an optical gyroscope and a low-phase-noise photonic oscillator.
Cátia Pinho is currently finalizing her Ph.D. from the MAP-tele Doctoral Programme in Telecommunications at the University of Aveiro, supervised by António Teixeira and Mário Lima, Professors of the Department of Electronics, Telecommunications and Informatics (DETI) of University of Aveiro and senior researchers from IT.