The famous chirped pulse amplification technology opens the way to the petawatt laser with the peak-power
up to 10 15 Watt. In the past decades, especially in recent several years, due to significant engineering
improvement, tens of 1 ~ 2-petawatt lasers and two 10-Petawatt lasers have been successfully demonstrated,
however, the rapid development seems to have encountered a bottleneck recently. To break through
the development bottleneck and further increase the peak-power, technique improvements become indispensable
in the near future. In this paper, by analyzing the development trend, recent technological improvements
in Japan are introduced. Based on considerations of both peak-power scaling and economic-
cost containment, methods are proposed to reduce pulse duration instead of only to increase pulse
energy, providing a possible chance to further development of the ultra-intense laser.
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