IN THE FIVE YEARS after the invention of the laser in 1960, tabletop lasers advanced in a series of technological leaps to reach a power of one gigawatt (109 W).

• 1960年雷射发明后的五年间，桌上型雷射的发展经由一系列的科技跃迁，已进展到10亿瓦功率的地步。