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美国加利福尼亚州Mountain View的光谱物理所在1989年5月收到一份能产生微微秒脉冲的光纤激光器的专利。这种取得专利权的器件把掺稀土玻璃(如掺铒或掺钕玻璃)光纤的增益功能与脉冲形成光纤结合起来,从而产生总的负群速色散。可用一只锁模器来驱动激光脉冲,并且在脉冲成形光纤中自相调制和群速色散的结合将会进一步缩短脉冲。采用这种孤立子脉冲成形技术,有可能产生约为100fa的脉冲。
In May 1989, the spectral physics of Mountain View, California, USA, received a patent for a fiber laser capable of generating pico-second pulses. This patented device combines the gain function of an optical fiber doped with rare earth glass (such as erbium-doped or neodymium-doped glass) with a pulse-forming optical fiber to produce total negative group velocity dispersion. A mode-locked laser can be used to drive the laser pulse and the combination of self-modulation and group velocity dispersion in the pulse-shaped fiber will further shorten the pulse. With this soliton pulse shaping technique, it is possible to generate a pulse of about 100 fa.