Ld Double-end Pumping Of Nd: Yvo <sub> 4 </ Sub> Q-switched Green Laser

In this dissertation, the development history process of all-solid-state lasers is reviewed and summed up firstly, and the research evolutions of diode-pumped solid-state lasers are generalized along high powered, multi-wavelengthed and miniaturized directions respectively. In the chapter 2, rate equation theory, oscillator cavity designing theory, pumping designing theory, the second harmonic generation theory and Q switching theory are generalized. These creative studies and learning work are accomplished in this dissertation.Creative studies:1. A laser interferometry method of measuring the thermal lensing of end-pumped solid-state lasers is proposed.This method provides a simply to be carried out,having no influence on laser system, high spatial resolution and real-time means for diagnosing thermal lensing. By this method, thermal lensing of end-pumped Nd:YV04 laser is studied generally. And this work can provide references for studying the thermal effects of laser medium and designing lasers of this kind.2. For diode end-pumped Nd:YVO4 Solid-state Laser, a scheme employing twin laser crystals to compensate thermal effects is brought forward. At the same time laser output can be enhanced, and the loss resulting from additional optical elements can be avoided, Q-switching and efficient frequency-doubling can be met in this scheme.3. In the measurement of the nonlinear refraction index of 4mm thick Nd:YVO4 crystal, single-beam Z scan is employed, and the measurement data is processed according to the Z scan theory of thin sample. as the result, therefraction index, which tallies with the one resulting from other different measurement, is obtained. So the rationality and the validity of this simple measurement and processing method is proved. Learning work:A kind of "LD dual-end-pumped Nd:YV04 Q-switching green laser" is developed successfully. Its maximum output is 3.2W, at 10.5kHz modulating frequency and 19W input, when, the output pulse width is 28.7ns(FWHW), and the optical to optical conversion efficiency is 16.8%.