A novel approach produces a completely new kind of dynamic light structure

Phys.org  August 24, 2020 At a given distance light can dynamically rotate around its center and revolve around another central axis. An international team of researchers (USA – UCSF, Naval Information Warfare Center, University of Rochester, Israel) has shown that combining twisted light and frequency combs together can produce an even more novel structure of light. The beams they simulated achieved mode purity up to 99%, and also had control of the helical phase front. The findings shed insight on our basic understanding of light generation and propagation. This innovation may have future applications in sensing, imaging, manufacturing, and metrology. […]

On-chip light source produces versatile range of wavelengths

Science Daily  December 19, 2019 A team of researchers in the US (NIST, University of Maryland, Carnegie Mellon University) has created visible light from an infrared pump by widely separated optical parametric oscillation (OPO) using silicon nanophotonics. The OPO creates signal and idler light in the 700 nm and 1300 nm bands, respectively, with a 900 nm pump. It operates at a threshold power of (0.9±0.1)mW, over 50× smaller than other widely separated microcavity OPO works, which have been reported only in the infrared. This low threshold enables direct pumping without need of an intermediate optical amplifier. The device design […]