The paper reports our proceedings on the compacting techniques of laser systems:form the point of view of design

we investigated the coupling efficiency of tight-pumped system. We have taken a series experiments or the diode-pumped Nd:YVO

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laser

including high-repetition rate Qswitching and single-axial-node prelase Q-switching;We develop the steady-state mode-lacking theory and obtain calculationformula of the pulse width of actively mode-locking with the consid- eration of the self-phase-molulation of the laser medium. The continuous wave mode-locking is achieved on a Nd:YVO

laer pumped by a borne-shade LD with pulse width of 43 ps.Self- mode-locking of Ti:sapphir:laser is achieved. The steady-state pule width is 24.6 fs. Spectrum width FWHIVI as wide as 5' nm is also achieved. We calculate the working properties of the dou- ble-medium amplifier and vestigate several questions in CPA. The formula of minimum pulse width that cou5d be achievd in CPA is obtained. Gain saturation in chirped pulse amplification is also researched. It is founcthat the lower SNft corresponds to spectrum aberration. The concept of non-resonate-amplification(NRA) is proposed to reform the spectrum aberration and increase the SNR of compressed ptses.