Theoretical Analysis And Optimization Of The Injection-Locked Ti: Sapphire Lasers

The high power, frequency-stabilized and narrow linewidth lasers have wide applications in the researches of the laser radar, the ultra-precise spectroscopy, the laser cooling and trapping, especially the optical atomic clocks. Up to now, the injection locking technique is an effective method to obtain such lasers. In order to supplying the laser source for the 3D optical lattice in our Yb atomic clock experiments, we design an injection-locked Ti:sapphire laser at 759 nm by taking the advantages of the injection locking technique and the Ti:sapphire laser. Therefore it is necessary for us to carry out the theoretical study and optimization of the injection-locked Ti:sapphire laser.This thesis deals with the theoretical analysis and optimization of the injection-locked Ti:sapphire laser in detail. Theoretically, the analyses mainly focused on maximizing the output power of the slave laser (Ti:sapphire laser) and improving the frequency stability of the injection-locked laser system are presented. Firstly, the impacts of various parameters of the ring Ti:sapphire laser on its threshold and slope efficiency are investigated by using the numerical method, based on the fact that the injection-locked and free-running lasers almost have the same maximum output power and slope efficiency. And the numerical results are in good agreement with the reported experimental results for a 3.0 W injection-locked Ti:sapphire laser at 756 nm, the output power could reach to 4.12 W by optimizing parameters, which show that the numerical analysis results not only clarify the roles of various parameters in affecting the laser output power, but also are guidelines for design such end pumped lasers. Secondly, the principle of the PDH technique and the control feedback theory are reviewed and two different servo feedback systems are analyzed. Based on these, an optimal servo feedback system is determined for an Ultra-stable injection-locked laser system.Experimentally, the design of a 759 nm injection-locked Ti:sapphire laser and the measurement schemes of some key parameters are studied. According to the above theoretical analyses and our experiment requirements, we introduce a detailed design of a 759 nm injection-locked Ti:sapphire laser, particularly the design of a ring Ti:sapphire laser and our experimental development. Additionally, the measurement schemes of the linewidth of the diode laser by beating frequency, the high reflectivity of the ring cavity mirror by the continuous-wave cavity ring down spectroscopy technique and the Q factor of the ring cavity by phase modulation of laser are detailedly presented.