For decades, laser engineers have wrestled with an embarrassing blind spot: the green-through-yellow slice of the visible spectrum, roughly 532 to 633 nanometers, where compact semiconductor lasers ...

Researchers in Quebec, Canda, have developed the first fiber laser that can produce femtosecond pulses in the visible range of the electromagnetic spectrum. Fiber lasers producing ultrashort, bright ...

For years, scientists have fabricated small, high-quality lasers that generate red and blue light. However, the method they typically employ — injecting electric current into semiconductors — hasn’t ...