A short-pulse measurement and detection apparatus utilizing an aperiodic non-linear quasi-phase matched (A-QPM) material. The bandwidth of the A-QPM non-linear material is such that an interaction between a first signal and a second signal occurs, facilitating measurements of signal properties by techniques...http://www.google.com.au/patents/US7570851?utm_source=gb-gplus-sharePatent US7570851 - Ultrashort photonic waveform measurement using quasi-phase-matched non-linear optics
