Abstract

Over the past few years the techniques employed to characterise ultra-short pulses have matured greatly. Methodologies such as second harmonic generation frequency-resolved optical gating (SHG-FROG) [1] have been successfully used to determine the amplitude and phase of pulses from modelocked laser oscillators. SIIG-FROG however has two fundamental disadvantages: it is insensitive to the sign of the pulse phase and has a limited measurement bandwidth because it uses a phase-matched SHG crystal.

© 2000 IEEE