We describe a cross-correlation-based frequency-resolved optical gating (XFROG) technique for simultaneously measuring the amplitude and phase of two ultrashort pulses that have different wavelengths but are derived from a common mode-locked oscillator. A measurement is presented in which 4.0-μm mid-IR pulses from a synchronously pumped femtosecond optical parametric oscillator (OPO) are characterized by mixing with the 770-nm OPO pump pulses. Details of the pulse-retrieval algorithm are included, together with examples of pulse data retrieved from the experimentally measured XFROG trace.
© 2000 Optical Society of America
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(140.4050) Lasers and laser optics : Mode-locked lasers
(190.4970) Nonlinear optics : Parametric oscillators and amplifiers
(320.7100) Ultrafast optics : Ultrafast measurements
D. T. Reid, P. Loza-Alvarez, C. T. A. Brown, T. Beddard, and W. Sibbett, "Amplitude and phase measurement of mid-infrared femtosecond pulses by using cross-correlation frequency-resolved optical gating," Opt. Lett. 25, 1478-1480 (2000)