In order to take full advantage of amplifier gain-bandwidth,and obtain a shorter pulse with higher power in the terminal,it is necessary to conduct a spectrum shaping before the seed pulse being injected into the main amplifier chain to compensate the effect of gain narrowing.

Through the spectrum shaping, the bandwidth of the regeneratively amplified pulse was increased from approximately 20 nm to approximately 35 nm, which is near the bandwidth of the seed pulse.

The spectrum width is expanded from 38 nm to 66 nm,and the output laser pulse is consequently squeezed from 35 fs to 20 fs in the 10 Hz femtosecond regenerative amplifier,with an acoustic-optic programmable dispersive filter(AOPDF) for dispersion pre-compensation and spectrum shaping of the input seed pulses.

A new method of the chirped-pulse spectrum shaping is put forward in this paper based on the above course.

A new method of spectrum shaping technique is proposed based on adjusting peak value of spectrum and multi scale factors to overcome these two disadvantages.

According to the key problem in DAA,spectrum shaping for UWB transmitted waveform,the state of arts on the research work is reviewed,and the development trend is analyzed.

The design methods of key data,such as spectrum adjusting range,resolution and diffraction efficiency,are specially introduced.

Researchers can quickly and exactly get fluorescence spectrum curves and the peak value of analytical samples by fluorescence analyzer, can decide crude properties according to the fluorescence peak values and differernces of crude property indexes, and also can make oil oil correlation and oil rock correlation by combination of.

For improving the uniformity of the focal spot in the inertial confinement fusion(ICF) experiments,we simulated the effects of the different spectral shapes of broadband light with the focused spot through phase plate,such as random phase plate(RPP) or continuous phase plate(CPP), and the uniform bandwidth and maximal dispersive angle.