Cover Story
Archaeophotonics: Lasers Unveil the Past

David Artigas, Iain G. Cormack and Pablo Loza-Alvarez
Scientists use two-photon absorption fluorescence to recover written information on Roman relics and solve a 2,000-year-old mystery. more>>
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The Breakthrough Birth of the Diode Laser
Jeff Hecht
The birth of the diode laser 45 years ago happened very quickly. Decades after the discovery of LEDs, a key experiment showed that diode junctions could emit efficiently. Within four months, four groups had crossed the threshold. By Jeff Hecht more>>