Abstract
Recently, a new technique, which combines optical gating with high-gain optical parametric amplifier (OPA), had recently been demonstrated to characterize weak spatially incoherent optical pulses with a multi-shot cross-correlated frequency-resolved optical gating (XFROG). [1] The resulting OPA-XFROG had therefore been proposed to measure ultrashort optical signal with extremely low intensity. The detection sensitivity of OPA-XFROG is so high that the pulse energy of measurable optical signal can be as low as a few atto-joules (<100 photons). The direct comparison of the optical field profiles retrieved from OPA-XFROG and sum frequency generation (SFG) reveals that OPA-XFROG can be as accurate as SFG-XFROG. Multi-shot OPA-XFROG measurement requires a scan of delay time between the pump and signal pulses. The acquisition of a typical OPA-XFROG pattern can take up to more than 20 minutes. This is particularly problematic when the signal pulses are either weak or irreproducible from shot to shot. The single-shot FROG apparatus reported in this paper was designed to conquer such difficulties.[2, 3, 4]
© 2004 Optical Society of America
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