Study On The Femtosecond Optical Parametric Oscillator And The Acousto-Optic Programmable Dispersion Filter

In this dissertation, theoretical and experimental studies of non-critical phase-matched femtosecond optical parametric oscillator (OPO) and the acousto-optic programmable filters (AOPDF) are presented. The main contents of this dissertation are classified as follows:The development and application of the femtosecond pulse lasers, the femtosecend OPO and the AOPDF are introduced firstly.The high average power Ti:Sapphire oscillator - the pump source of the femtosecond OPO is introduced in Chapter 2. The theory of Kerr lens mode- locking , the characteristic of the high average power femtosecond lasers , the setup of the Ti:Sapphire oscillator and the parameters of the output pulses are included. The principle and experimental design of femtosecond OPO are presented.The experiment and analysing of the femtosecond OPO are introduced in chapter 4. The focal point of the experiment is cavity length matching.Served as an amplitude and phase modulator, the acousto-optic programmable filter (AOPDF) is introduced. It can compensate for dispersion and precompensate for gain narrowing in femtosecond chirp-pulse amplifier (CPA) in real time. Numerical simulation shows the characteristic of the AOPDF in the femtosecond pulse compression, which utilizes the LiNbO3 crystal as an acousto-optic crystal.Two arithmetics are compared in the calculation of theoretical optimal spectral phase function of phase-only pulse shaping in Chapter 6. They are iterative Fourier transform (IFT) and simulated annealing arithmetics.The numerical calculation indicates that the convergent rate is faster by using the IFT. So we developed a single step pulses shaping technic by using the IFT and SPIDER.