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We demonstrate a high-quality cross-polarized-wave filter based on spectral phase modulation.Driven by well-conmpressed spectral-phase fully-compensated fundamental laser pulses,the filter stretches the pulse bandwidth from 35 nm to 70 nm with a conversion efficiency of 20％.After implementing the filter into a femtosecond TW Ti:sapphire laser system,we generate 40mJ output pulse energy with pulse duration of 18.9fs.The temporal contrast of the compressed pulse is enhanced to 109.