Scientists in Finland transmitted electricity through air using sound waves, lasers, and radio frequencies, creating ...

Spectroscopy techniques require the sweeping of emission frequency across molecular lines to gather information about a sample. Although electrical frequency tuning of terahertz quantum cascade lasers ...

"People have done frequency tuning in lasers, or made a laser with high beam quality, or with high continuous wave power. But each design lacks in the other two factors," says Ali Khalatpour, a ...