  We demonstrate the generation of 100-{\mu}J-level multicolored femtosecond
pulses based on a single-stage cascaded four-wave mixing (CFWM) process in a
thin glass plate. The generated high-energy CFWM signals can shift the central
wavelength and have well-enhanced temporal contrast because of the third-order
nonlinear process. They are innovatively used as clean sampling pulses of a
cross-correlator for single-shot temporal contrast measurement. With a simple
home-made setup, the proof-of-principle experimental results demonstrate the
single-shot cross-correlator with dynamic range of 1010, temporal resolution of
about 160 fs and temporal window of 50 ps. To the best of our knowledge, this
is the first demonstration in which both the dynamic range and the temporal
resolution of a single-shot temporal contrast measurement are comparable to
those of a commercial delay-scanning cross-correlator.
