Research On Electro-optical Cavity-dupmed With Narrow Pulse And High Peak Power Laser

With the advantage of all solid state laser as the breakthrough point, first of all, displaying the development of all-solide-state laser. Through the contrast and summary, choosing the crystal of Nd:YAG and Nd:YVO4 as electrooptical cavity-dumped experiment and acousto-optical experiment laser material, respectively. Regarded KD*P as electro-optical crystal.Using Q-Switching rate equation, the relationship between pulse average power and pulse width with inverted population density is explained in this paper by theoretical analysis and reasonable model. Using LD side pumped Nd:YVO4 crystal which is polarized absorption and emission in a flat-flat cavity to achieve narrow pulse width. Cavity length, repetition rate and transmittance of output mirror as a function of pulse width have been discussed.Using Q-switched rate equations to make sure the optimum reflectivity, maximum pulse energy, largest peak power and pulse width as a function of the dimensionless variable z, and also analysing the influence of actively Q-switched pulse parameters under the condition of different cavity roundtrip dissipative loss, cavity gain and inversion reduction factor in Nd:YVO4 and Nd:YAG, respectively. The modeling results indicate that the optimum reflectivity and pulse width decrease with the increase of cavity roundtrip dissipative loss, and the maximum pulse energy and largest peak power decrease with the increase of inversion reduction factor which affects maximum pulse energy and largest peak power greatly. One can make the Q-switched pulse parameters embodied through the certain value of z.Aiming at the electro-optical Q-switched cavity-dumped experiment, choosed the straight cavity as electro-optical Q-switched cavity-dumped experimental model, which includes input mirror, output mirror, thin film plate and quarter-wave plate in the resonant cavity. Analysed the coating of thin film plate and the angle in the cavity, also analysed how the quarter-wave plate alters the direction of the polarized light and so on. Computed the delay about applied voltage and removed voltage of electro-optical crystal, reduced the interference of high voltage for light path through optimizing the experiment.