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The Theorical And Experimental Research Of Chirped Pulse Amplification Based On Ti: Sapphire Self-Mode Lock Laser

Posted on:2005-10-18Degree:MasterType:Thesis
Country:ChinaCandidate:Y L YuFull Text:PDF
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Nowadays, ultrahigh & ultra short laser are widely used in all fields from manufacture, scientific research to national defense. To gain high quality laser pulse of higher intensity & shorter pulse width has been a goal that the scientists chase of every country. Since the technique of Chirped pulse amplification (CPA) is the most important means to produce ultrahigh & ultra short laser, how to obtain high quality amplified laser pulse through this means had been become a hotspot in high-tech field. During the period of studying for Master degree, I was lucky to participate in the project of the research work about "CPA" system. The main works I have done are listed as following:1.Carefully Analyzing the femtosecond laser source-Ti:Sapphire self-mode locking laser. In this section, I put emphasis on the dispersive compensation and self-starting technique of Ti:Sapphire laser.2.When discussing dispersion compensation of laser cavity, boundary conditions was considered when analyzing chirped mirror dispersion compensation , and mathematic calculation and computer numerical simulation has been done, the result shows that considering boundary condition can led to a more precision result close to experimental result. The theory of self-starting of Ti:Sapphire laser has been discussed and some research works are done, detailed in the kinetic mechnism of self-starting.3.Improving and redesigning the system of "chirped pulse amplification": Including Ti:Sapphire laser, pulse stretcher, amplification cavity, compressor, and build up a CPA system.4. Analysis amplification laser cavity in CPA system, and the experiment is carried out. I adopt Maxwell-Bloch equation to analysis the interaction between pump laser and gain material, furthermore I do much work on all kinds of effects and their solutions of the amplification procedure. I put forward a new method that integrate grating and seed pulse modulator to restrain gain narrowing effect. Theoretical analysis shows that this method is feasible to integration and can make experiment easier, it is believable that the result of the experiment will be improved by this means.
Keywords/Search Tags:Ultra short & ultrahigh intensity pulse laser, Chirped pulse amplification, Chirped mirror, Semiconductor saturable absorber mirror, Multilayer grating, Gain saturation, Gain narrowing, OPCPA
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