A novel methodology to produce a high-power femtosecond using supercontinuum generation in hollow-fiber has been developed. In this work, femtosecond high energy laser pulses have been observed. These pulses were generated due to supercontinuum caused by self –phase modification (SPM) in neon gas filled in a one-meter hollow-ﬁber followed by two chirped-mirrors for dispersion compensation. The created pulses reached high energy of sub-mJ at 1 KHz repetition rate. The characterization of femtosecond pulses in the regime of few-cycle pulses is considered using spectral phase interferometry for direct electric-ﬁeld reconstruction (SPIDER). The SPIDER was used to observe precise measurements of pulse duration. The spectral bandwidth found to reach ultra-wide range from 600 – 950 nm. It has been found that the output pulse width is affected by the pulse duration of the injected femtosecond pulses into the optical fiber under different gas pressures. The observed results revealed that the nonlinear SPM increases with the gas pressure. The obtained pulses can be used to control the produced femtosecond laser characterization in future.