A KTP EOPO pumped by an AO Q-switched and SESAM mode-locked Nd<sup>3+</sup>: GdVO<sub>4</sub> laser is experimentally realized.
The cavity is designed to satisfy synchronously pump. The signal trace and output powers from the OPO are
experimentally measured. Based on the experiment, a dynamical rate-equation model is firstly set to simulate the
operation of the Q-switched and mode-locked OPO. The theoretical values from the rate equations agree with the
experimental results well. The developed model explains the behavior, which is helpful to system optimization.
Segmented mirror method is widely adopted in large optical telescopes nowadays in the world. Using segmented mirrors to make up a large mirror requires the segmented mirrors co-focus. It needs corresponding co-focus detecting methods to measure the co-focus errors. In China this kind of research is insufficient nowadays. In the paper, Zernike polynomial is used as Optical-Mechanical Interface, with the help of the engineering softwares, such as UG, Patran, Matlab, and the optical software CODE V to model and simulate the widely used Shack-Hartmann method. The relationship between S-H measurement and segmented mirror co-focus is found. Finally, a computer aided design method for optical measuring of segmented mirror co-focus is proposed.