A single-shot measuring apparatus with optical limiting for temporal pulse contrast of
kJ-class petawatt lasers in the nanosecond range is proposed. A
temporal linear filter comprising an electro-optical switch, a
polarizer, a temporal nonlinear filter composed of cascaded SHG
crystals, and a dichromatic mirror are, respectively, used as an
optical limiting apparatus for contrast measurement of nanosecond and
picosecond pulses to improve dynamic range and temporal resolution.
The apparatus has been applied to pulse contrast measurements at the
SG-II petawatt facility, achieving a high dynamic range of
1
0
10
and a fast time resolution of 107 ps
in the 350 ns range. This technique can also be universally applied to
the limiting of the main pulse of varying pulse widths to diagnose
pre-pulses during generation and transmission.
We propose a simple single-shot spatiotemporal measurement technique called coherent modulation imaging for the spatio-spectrum (CMISS), which reconstructs the full three-dimensional high-resolution characteristics of ultrashort pulses based on frequency-space division and coherent modulation imaging. We demonstrated it experimentally by measuring the spatiotemporal amplitude and phase of a single pulse with a spatial resolution of 44 µm and a phase accuracy of 0.04 rad. CMISS has good potential for high-power ultrashort-pulse laser facilities and can measure even spatiotemporally complicated pulses with important applications.
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