In July 1962, Robert Hall and some colleagues at the GE R&D Center in Niskayuna, NY, succeeded in doing what researchers in other labs in the US, France, Russia and elsewhere were seeking: to create coherent light emission from gallium arsenide junctions—giving rise to the first laser diode. In September that year, Hall published the results in Physical Review Letters and the rest, as they say, is history.
To celebrate the 50th anniversary of his seminal paper, we have turned to one of the leaders in more recent laser diode advances—David Welch, co-founder of Infinera—to present a webcast on the future of laser diodes. You can watch it live on September 12, or in the archive; there is also a video of David describing the history of laser diodes on our web site.
In this issue, we celebrate the laser diode with an article by researchers at KMLabs and the Colorado School of Mines on using blue laser diodes to pump a Ti:sapphire laser (page 35)—illustrating yet one more application for this extremely versatile tool that also enables optical data storage and fiber-optic communications.
Key developments can happen when you least expect them. One with such potential is the recent publication of Harnessing Light: Optical Science and Engineering for the 21st Century, by the National Academies, and its call for a National Photonics Initiative (you can download a copy at www.opticsandphotonics.org).
And a second, related development: Microsoft is hoping to hire hundreds of experienced optical engineers. This says much about current competitive markets and the powerful enabling role that photonics plays. Microsoft, Amazon, Google—with their readers and tablets, game boxes, fiber-optic networks, and optics-based cloud farms—are prime examples of how far we've come since that time 50 years ago when a few researchers worked weekends to make a p-n junction semiconductor laser.
