A dispersive, optical delay line for frequency modulated light wave pulses, especially laser waves, comprises a first optical grating and a second optical grating that are parallel to each other, separated by a distance d and localized with a pitch a on the surface of a material that has an index N and...http://www.google.com.tw/patents/US5602677?utm_source=gb-gplus-share專利 US5602677 - Dispersive optical delay line and use thereof for the compression/expansion of laser pulses
