Theoretical Research Of Techniques Of PW, Fs Magnitude Of Optical Parametric Chirped Pulse Amplification

Optical Parametric Chirp Pulse Amplification technology as an effective means to achieve ultrashort pulse laser in the world has a wide range of applications. Its have high gain coefficient, wide gain bandwidth, high signal-to-noise ratio, low thermal effect, the optical parametric chirp pulse technology has been widely applied to the super short laser pulse technology such as laser fusion and dynamic ultrafast spectroscopy High power and stable ultrashort pulse laser system is inseparable from the basic parameters of the theoretical study of optical, energy from the non-linear crystal to a three-wave angle of incidence of type I phase matching condition and to realize the signal light and the pump light distribution ratio and so affect the signal light amplification, optical parametric chirped pulse needs optimization amplification process. Therefore, this paper discusses the development of ultrashort laser history, the appropriate application direction, OPCPA technical advantages and disadvantages of the basic theory. This paper studies the chirped pulse laser on optical parametric process, the signal light gain, dispersion and other effects by optical parametric amplification process in the time domain and frequency domain do separately discussed to realize the power of optical parametric chirped pulse amplification system about PW magnitude, time compression to fs magnitude, provide the design of a theoretical reference for optimizing.The main contents are as follows:1. The theoretical study of optical parametric amplification process of derivation from the foundation of the Maxwell equations, deduced use three wave coupling equations, the gain of the amplification process in the process, the signal light and pumping light energy ratio of the nonlinear crystal demand length numerical simulation. Gaussian model is applied to discussion of optical parametric chirped pulse amplification process related problems, according to the optical parametric chirped pulse amplification nonlinear crystal length reaches saturation process can be useful as a reference to determine the initial conditions of the experiment.2. Use the nonlinear Schrodinger equation model as a transport theory to MATLAB programming language using fast Fourier transform FFT signal and fourth-order Runge-Kutta method of transmission of optical amplification, dispersion, gain and other transmission characteristics of chirped pulse effect of the time domain and frequency was studied. The greater the energy of the pump signal to obtain the gain is greater, the shorter the required length of the nonlinear crystal, after the gain of the optical parametric amplification process energy reflux saturation occurs, and frequency of the phenomenon as well as gain narrowing phenomena.3. Explains the importance of the phase matching optical parametric amplification process, several phase-matching method is described. Describes the characteristics of the optical properties of BBO, LBO, KDP nonlinear crystal ultrashort pulse laser and nonlinear terms of use and crystal birefringence dispersion equation for phase matching calculation of these three phases corresponding nonlinear nonlinear crystal matching angle curve, spatial walk-off angle, the parametric model parameters such as bandwidth.