What do you get when you combine red, blue, green, and yellow diode lasers?
Apparently, pretty fantastic-looking warm white light. Researchers at Sandia National Laboratories recently produced a white light made from lasers and tested it out on a bowl of fruit. The results were incredibly surprising.
Lighting experts have assumed in the past that diode lasers would be a poor source for creating white light. Lasers emit single, narrow wavelengths (very different from the sun’s broad spectral bands). Researcher Jeff Tsao explained,
Before these tests, our research in this direction was stopped before it could get started. The typical response was, ‘Are you kidding? The color rendering quality of white light produced by diode lasers would be terrible.’ So finally it seemed like, in order to go further, one really had to answer this very basic question first.