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This paper report the recent progresses on the XL-III facility by using a new front-end and optimizing the energy output from the final amplifier. To increase the contrast ratio, some novel techniques such as ring regenerative amplifier with ultra-long cavity length, double chirped pulse amplification (DCPA) and cross-polarized wave generation (XPW) were carried out. Contrast ratio of higher than 10 was demonstrated with combination of DCPA and XPW. The output energy from last stage was boosted to 45 J pumped with laser energy of 120 J at 527 nm. With the preliminary measurement of pulse duration of 31 fs, it supports the peak power nearly 1 PW.

Route to High Contrast and Focusable Intensity in PW-Class Femtosecond Ti:sapphire Laser Facility