The Characteristics Of All Solid-State Lasers

Diode-pumped (LD) all-solid-state lasers have become a central of focus in the field of lasers due to their many advantages such as high efficiency, compactness, high stability, and long lifetime. They are widely used in the field of industry, scientific research, national defence and military, medical treatment, etc. Here, we use high power LD as pump resource, make the Nd:YVO4/Nd:YAG lasers base, and obtained the second harmonious generation of green with high peak power at 532nm and blue light at 473nm using nonlinear crystals-KTP and LBO, respectively. The contents are outlined as followed:1. We review the history and development of diode-pumped all-solid-state lasers(DPSL); introduce its main advantages compared with diode lasers and solid lasers, and various laser materials used in diode pumped solid-state lasers; summarize the main approaches and the prospect of DPSL and the main contents of this dissertation is outlined.2. Based on the equations of velocity, a theoretical analysis and numerical simulating method of peak power and repetition rate of pulse considering the characteristic of the saturated absorber-Cr4+:YAG. are presented. We discuss the influence on the average output power if the thermal lenses and mode matching are taken into account. A maximum of 4.23 W of average output, 18kW of high peak power and 8ns of pulse width in the wavelength of 1064nm has been obtained with 21.1W diode pumping power in Nd:YVO4. At last, we analyzed the result which average output power declined while pump power increased.3. According to the principle of phase matching and frequency doubling and with the optic characteristic of KTP crystal, narrow pulse width(13ns), high repetition rate(21kHz) green laser at the wavelength of 532nm have been demonstrated by extracavity frequency doubling with KTP crystal in an Nd:YVO4 passively Q-switched laser. And maximum of average output power (684mW) has been obtained by intracavity frequency doubling, its peak power reaches to 3.08kW compared with 750W by extracavity frequency doubling. Finally, we compare the different properties of green when pumped by CW and QCW. When pumped by CW, the threshold is just 1.02W, but its increase is slow; Though the threshold of QCW is higher than CW, its increase is fast.4. We review the history, the development at home and abroad and the difficult problems of dilde-pumped all-solid-state blue lasers. And the principle of frequency doubling and the property of NdrYAG crystal about the oscillation of 946nm have been dissertated systematically. First we plan to use Nd:YVC>4 to generate 914nm light, We have demonstrated a Nd:YAG laser that produced 89mW of CW output power at the wavelength of 473nm with the nonlinear crystal LBO, the slope efficiency is 1.1 % and the conversion efficiency is 1.2%. Compared with similar experiments, our result is not so satisfying. We hope we can improve our experimental conditions so that we will achieve better outcome.