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Based on cross-polarized wave generation, a robust front-end is designed for improving pulse temporal quality of a petawatt Ti:sapphire laser. High-contrast seed pulses with 105μJ energy and excellent beam profile can be generated by the front-end. The spectral width of the clean pulses is over 65nm (FWHM), which can support sub-15fs pulse duration. Injecting the clean pulses into the petawatt Ti:sapphire...
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