| In the past ten years, femtosecond laser technology has made great progress, andthe tabletop chirped pulse amplification (CPA) system has become an importanttechnique to acquire high-energy femtosecond pulses, which has opened up a widevariety of applications in many fields. However, more compact,all-solid-state,cost-effective and stable femtosecond oscillators and amplifiers are desired in thoseapplications. This dissertation presents a deep study of the laser oscillator and thelow-repetition-rate chirped pulse amplifier system, both theoretically andexperimentally. The main contents of this thesis are as follows: 1． The development, progress in femosecond laser technology and the CPA system as well as the applications of femosecond laser pulses in many fields were included. 2． On the basis of the physical and chemical characteristics of Ti: Sapphire, the principles, self-starting mechanism and compact design of the femtosecond oscillator were explained in detail. The Kerr-lens mode-locking mechanism was analyzed following a discussion of the principles of various mode-locking mechanisms. The design and results of narrow-band SESAM were discussed. The structure and output parameters of a stable self-starting oscillator were shown. And the stability of our oscillator was also analyzed. 3． Based on the theoretical calculation, an optimal choice between the Martinez stretcher and the Offner stretcher was made for our special system. 4． A low-repetition-rate CPA system was designed, which consisted of a regenerative amplifier and a four-pass amplifier, which operated stably and could self-start.
|
PDF Full Text Request