Chracteristics of high-order harmonic generation(HHG) from noble gases driven by femtosecond terawatt Ti:sapphire laser pulses was investigated and high-order harmonics near the Carbon K-edge were detected. The HHG experiment was performed with a femtosecond chirped-pulse-amplification Ti:sapphire laser which has pulse duration of about 25fs and energy of 60mJ. The laser pulse was focused into gas jet with a small nozzle of 200㎛ diameter. Chrateristic behaiors of high harmonic cutoff from He and Ne were investigated by changing laser intensity, target position, and chirp of incident laser. High-order harmonics with much shorter wave length were generated with high-intensity lasers, low-density gases, and positively chirped laser pulses.
