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Abstract: This paper discusses the ultra short pulse generation of laser, ultrashort laser pulse since its birth has been moving towards shorter and wider and stronger band in the direction of development, shorten the pulse width of the reform has experienced three stages: the Q modulation laser phase lockphase laser technology, mold and chirp pulse amplification stage technology. Has gone through the active mode locking, passive mode locking, collision locking, the use of these mode locking technique can be laser pulse generated by the Q modulationtechnology to shorten the sub picosecond nanosecond. Because the amplification technology lead to nonlinear effect of crystalmedium of self mode locking technique and the chirped pulse,laser pulse width output can be short to femtosecond magnitude,pulse power up to TW, pat watts range, high peak power andembodies the perfect combination of low average power. From the use of Q modulation technology, mode locking technique so that the development of chirped pulse amplification technology to now,single pulse laser power increase of up to 6 orders of magnitude,so that the laser matter interaction in this research field has entered a new stage.
Keywords: ultra short pulse laser, Q modulation technology,locking, chirped pulse amplification
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