The dependence of the temporal wave-form and frequency spectrum of the broad-band laser pulse stacked by chirped pulses on the parameters of the sub-pulses is investigated theoretically and numerically. It is shown that, the temporal wave-form of the broad-band lasers stacked by the transform-limited pulses is usually smoothing, while that stacked by chirped pulses takes detrimental modulation. And the former consists of one spectrum line, while the latter consists of multiple spectrum lines. In addition, with the delay-time between neighboring sub-pulses increasing, the modulation riding on t...
