1.444 Micron Laser Nd: Yag Solid-state Laser Output

Owing to 1.444μm laser generated by Nd:YAG solid-state laser have markedadvantages, people are paying more attention to it. 1.444μm laser are widely usedin scientific research, production, iatrology and military owing to its safety to eyes,strongly absorbed characteristic in water and putting out middle infrared laser with1.064μm laser. Recently, more and more people are studying 1.444μm laser inChina, however, the technology is unmatured, especially the pulse energy is lowwhich greatly limits its application. This paper includes systematic analysis to basictheory of Nd:YAG solid-state laser, the optimum design of laser and output of1.444μm laser by the dispersive prism resonator. The primary content reads asfollows:Firstly, we further analyze the running mechanism of four-level systemNd:YAG laser using the theory of velocity equation, the energy level configurationand spectrum characteristic of Nd:YAG crystal. What's more, we make acomparison between 1.444μm and the other's stimulated cross sections , andestimate the output difficulty of 1.444μm laser.Secondly, on the basis of lenses'structure, we design the line resonator and theflexura resonator, and the experiments indicate that it is impossible to generate1.444μm laser only using lenses. Then we draw useful lessons from theexperiments , reasonably design the dispersive prism resonator and succeed ingenerating 1.444μm laser through Nd:YAG crystal of 1.064μm. In the experiment,we bring forward a better project to precisely adjust azimuth angle of the prism andholophote.